It isn't used anymore and uses constants which no longer exist.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Also rename the corresponding field isoc_ctl in struct em28xx
to usb_ctl.
We will use this struct for USB bulk transfers, too.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

It will be used for USB bulk transfers, too.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Rename EM28XX_NUM_PACKETS to EM28XX_NUM_ISOC_PACKETS and
EM28XX_DVB_MAX_PACKETS to EM28XX_DVB_NUM_ISOC_PACKETS to
clarify that these values are used only for isoc usb transfers.
Also use the term num_packets instead of max_packets, as this
is how these values are used and called in struct urb.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

em28xx_copy_video uses a wrong offset for the target buffer
when copying the data from an USB isoc packet. This happens
only for the second and all following lines in the packet.
The reason why this bug doesn't cause image corruption with
my test device (SilverCrest Webcam 1.3 MPix) is, that this
device never sends any packets that cross the end of a line.
I don't know if all devices behave like this, so this patch
should be considered for stable.
With the upcoming patches to add support for USB bulk transfers,
em28xx_copy_video will be called once per URB, which will
always trigger this bug.
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

When em28xx_ir_init() fails due to an configuration error, it frees the memory
of struct em28xx_IR *ir, but doesn't set the corresponding pointer in the
device struct to NULL.
On device removal, em28xx_ir_fini() gets called, which then calls
rc_unregister_device() with a pointer to freed memory.
Fixes bug 26572 (http://bugzilla.kernel.org/show_bug.cgi?id=26572)
Signed-off-by: NFrank Schäfer <fschaefer.oss@googlemail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Newer em28xx chipsets (em2874 and upper) are capable of supporting
RC6 codes, on both mode 0 (command mode, 16 bits payload size, similar
to RC5, also called "Philips mode") and mode 6a (OEM command mode,
with offers a few alternatives with regards to the payload size).
I don't have any mode 6a control ATM to test it, so, I opted to add
support only to mode 0.
After this patch, adding support to mode 6a should not be hard.
Tested with a Philips television remote controller.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

By disabling the NEC parity check, it is possible to handle all 3 NEC
protocol variants (32, 24 or 16 bits).
Change the driver in order to handle all of them.
Unfortunately, em2860/em2863 provide only 16 bits for the IR scancode,
even when NEC parity is disabled. So, this change should affect only
em2874 and newer devices, with provides up to 32 bits for the scancode.
Tested with one NEC-16, one NEC-24 and one RC5 IR.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Those two tuners may also be needed.
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

I noticed that the EM28XX DVB driver doesn't auto select all of the
appropriate DVB tuner modules required. In particular I needed
DVB_LGDT3305 for my a340, but it looks like DVB_MT352 + DVB_S5H1409 were
missing as well.
Signed-Off-by: NJonathan McDowell <noodles@earth.li>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
- WARNING: Prefer netdev_notice(netdev, ... then dev_notice(dev, ... then pr_notice(...  to printk(KERN_NOTICE ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
and add pr_fmt.
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_dbg(netdev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch error.
- ERROR: that open brace { should be on the previous line
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_dbg(netdev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_dbg(netdev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch error.
- ERROR: that open brace { should be on the previous line
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

dvb_unregister_frontend has to be called before detach. Otherwise the
unregister call will segfault. This made tm6000-dvb module unload unusable.
Signed-off-by: NJulian Scheel <julian@jusst.de>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_dbg(netdev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
- WARNING: Prefer netdev_dbg(netdev, ... then dev_dbg(dev, ... then pr_debug(...  to printk(KERN_DEBUG ...
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warning.
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

This should fix a potential race condition, when the irq handler
triggers while rc_register_device is still setting up the rdev->raw
device.
This crash has not been observed in practice, but there should be a very
small window where it could occur. Since ir_raw_event_store_with_filter
checks if rdev->raw is not NULL before using it, this bug is not
triggered if the request_irq triggers a pending irq directly (since
rdev->raw will still be NULL then).
This commit was tested on nuvoton-cir only.

Cc: Jarod Wilson <jarod@redhat.com>
Cc: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: David Härdeman <david@hardeman.nu>
Signed-off-by: NMatthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

This fixes a problem in fintek-cir and nuvoton-cir where the
irq handler would trigger during module load before the rdev member was
set, causing a NULL pointer crash.
It seems this crash is very reproducible (just bombard the receiver with
IR signals during module load), probably because when request_irq is
called, any pending intterupt is handled immediately, before
request_irq returns and rdev can be set.
This same crash was supposed to be fixed by commit
9ef449c6 ("[media] rc: Postpone ISR
registration"), but the crash was still observed on the nuvoton-cir
driver.
This commit was tested on nuvoton-cir only.

Cc: Jarod Wilson <jarod@redhat.com>
Signed-off-by: NMatthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Before, labels were simply numbered. Now, the labels are named after the
cleanup action they'll perform (first), based on how the winbond-cir
driver does it. This makes the code a bit more clear and makes changes
in the ordering of labels easier to review.
This change is applied only to the rc drivers that do significant
cleanup in their probe functions: ati-remote, ene-ir, fintek-cir,
gpio-ir-recv, ite-cir, nuvoton-cir.
This commit should not change any code, it just renames goto labels.

[mchehab@redhat.com: removed changes at gpio-ir-recv.c, due to
 merge conflicts]
Signed-off-by: NMatthijs Kooijman <matthijs@stdin.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

precalculate_line() is not very high on profile, but it calls expensive
gen_twopix(), so let's polish it too:
    call gen_twopix() only once for every color bar and then distribute
    the result.
before:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 46K of event 'cycles'
    # Event count (approx.): 15574200568
    #
    # Overhead          Command         Shared Object
    # ........  ...............  ....................
    #
        27.99%             rawv  libc-2.13.so          [.] __memcpy_ssse3
        23.29%           vivi-*  [kernel.kallsyms]     [k] memcpy
        10.30%             Xorg  [unknown]             [.] 0xa75c98f8
         5.34%           vivi-*  [vivi]                [k] gen_text.constprop.6
         4.61%             rawv  [vivi]                [k] gen_twopix
         2.64%             rawv  [vivi]                [k] precalculate_line
         1.37%          swapper  [kernel.kallsyms]     [k] read_hpet
after:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 45K of event 'cycles'
    # Event count (approx.): 15561769214
    #
    # Overhead          Command         Shared Object
    # ........  ...............  ....................
    #
        30.73%             rawv  libc-2.13.so          [.] __memcpy_ssse3
        26.78%           vivi-*  [kernel.kallsyms]     [k] memcpy
        10.68%             Xorg  [unknown]             [.] 0xa73015e9
         5.55%           vivi-*  [vivi]                [k] gen_text.constprop.6
         1.36%          swapper  [kernel.kallsyms]     [k] read_hpet
         0.96%             Xorg  [kernel.kallsyms]     [k] read_hpet
         ...
         0.16%             rawv  [vivi]                [k] precalculate_line
         ...
         0.14%             rawv  [vivi]                [k] gen_twopix
(i.e. gen_twopix and precalculate_line overheads are almost gone)
Signed-off-by: NKirill Smelkov <kirr@mns.spb.ru>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

The "dev->mvcount % wmax" thing was showing high in profiles (we do it
for each line which ~ 500 per frame)
           ?     000010c0 <vivi_fillbuff>:
                 ...
      0,39 ? 70:???mov    0x3ff4(%edi),%esi
      0,22 ? 76:?  mov    0x2a0(%edi),%eax
      0,30 ?    ?  mov    -0x84(%ebp),%ebx
      0,35 ?    ?  mov    %eax,%edx
      0,04 ?    ?  mov    -0x7c(%ebp),%ecx
      0,35 ?    ?  sar    $0x1f,%edx
      0,44 ?    ?  idivl  -0x7c(%ebp)
     21,68 ?    ?  imul   %esi,%ecx
      0,70 ?    ?  imul   %esi,%ebx
      0,52 ?    ?  add    -0x88(%ebp),%ebx
      1,65 ?    ?  mov    %ebx,%eax
      0,22 ?    ?  imul   %edx,%esi
      0,04 ?    ?  lea    0x3f4(%edi,%esi,1),%edx
      2,18 ?    ?? call   vivi_fillbuff+0xa6
      0,74 ?    ?  addl   $0x1,-0x80(%ebp)
     62,69 ?    ?  mov    -0x7c(%ebp),%edx
      1,18 ?    ?  mov    -0x80(%ebp),%ecx
      0,35 ?    ?  add    %edx,-0x84(%ebp)
      0,61 ?    ?  cmp    %ecx,-0x8c(%ebp)
      0,22 ?    ???jne    70
so since all variables stay the same for all iterations let's move
computations out of the loop: the abovementioned division and
"width*pixelsize" too
before:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 49K of event 'cycles'
    # Event count (approx.): 16475832370
    #
    # Overhead          Command           Shared Object
    # ........  ...............  ......................
    #
        29.07%             rawv  libc-2.13.so            [.] __memcpy_ssse3
        20.57%           vivi-*  [kernel.kallsyms]       [k] memcpy
        10.20%             Xorg  [unknown]               [.] 0xa7301494
         5.16%           vivi-*  [vivi]                  [k] gen_text.constprop.6
         4.43%             rawv  [vivi]                  [k] gen_twopix
         4.36%           vivi-*  [vivi]                  [k] vivi_fillbuff
         2.42%             rawv  [vivi]                  [k] precalculate_line
         1.33%          swapper  [kernel.kallsyms]       [k] read_hpet
after:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 46K of event 'cycles'
    # Event count (approx.): 15574200568
    #
    # Overhead          Command         Shared Object
    # ........  ...............  ....................
    #
        27.99%             rawv  libc-2.13.so          [.] __memcpy_ssse3
        23.29%           vivi-*  [kernel.kallsyms]     [k] memcpy
        10.30%             Xorg  [unknown]             [.] 0xa75c98f8
         5.34%           vivi-*  [vivi]                [k] gen_text.constprop.6
         4.61%             rawv  [vivi]                [k] gen_twopix
         2.64%             rawv  [vivi]                [k] precalculate_line
         1.37%          swapper  [kernel.kallsyms]     [k] read_hpet
         0.79%             Xorg  [kernel.kallsyms]     [k] read_hpet
         0.64%             Xorg  [kernel.kallsyms]     [k] unix_poll
         0.45%             Xorg  [kernel.kallsyms]     [k] fget_light
         0.43%             rawv  libxcb.so.1.1.0       [.] 0x0000aae9
         0.40%            runsv  [kernel.kallsyms]     [k] ext2_try_to_allocate
         0.36%             Xorg  [kernel.kallsyms]     [k] _raw_spin_lock_irqsave
         0.31%           vivi-*  [vivi]                [k] vivi_fillbuff
(i.e. vivi_fillbuff own overhead is almost gone)
Signed-off-by: NKirill Smelkov <kirr@mns.spb.ru>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Though dev->line[] is u8 array we work with it as with u16, u24 or u32
pixels, and also pass it to memcpy() and it's better to align it to at
least 4.
Before the patch, on x86 offsetof(vivi_dev, line) was 1003 and after
patch it is 1004.
There is slight performance increase, but I think is is slight, only
because we start copying not from line[0]:
    ---- 8< ---- drivers/media/platform/vivi.c
    static void vivi_fillbuff(struct vivi_dev *dev, struct vivi_buffer *buf)
    {
            ...
            for (h = 0; h < hmax; h++)
                    memcpy(vbuf + h * wmax * dev->pixelsize,
                           dev->line + (dev->mv_count % wmax) * dev->pixelsize,
                           wmax * dev->pixelsize);
before:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 49K of event 'cycles'
    # Event count (approx.): 16799780016
    #
    # Overhead          Command         Shared Object
    # ........  ...............  ....................
    #
        27.51%             rawv  libc-2.13.so          [.] __memcpy_ssse3
        23.77%           vivi-*  [kernel.kallsyms]     [k] memcpy
         9.96%             Xorg  [unknown]             [.] 0xa76f5e12
         4.94%           vivi-*  [vivi]                [k] gen_text.constprop.6
         4.44%             rawv  [vivi]                [k] gen_twopix
         3.17%           vivi-*  [vivi]                [k] vivi_fillbuff
         2.45%             rawv  [vivi]                [k] precalculate_line
         1.20%          swapper  [kernel.kallsyms]     [k] read_hpet
    23.77%           vivi-*  [kernel.kallsyms]     [k] memcpy
                     |
                     --- memcpy
                        |
                        |--99.28%-- vivi_fillbuff
                        |          vivi_thread
                        |          kthread
                        |          ret_from_kernel_thread
                         --0.72%-- [...]
after:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    #
    # Samples: 49K of event 'cycles'
    # Event count (approx.): 16475832370
    #
    # Overhead          Command           Shared Object
    # ........  ...............  ......................
    #
        29.07%             rawv  libc-2.13.so            [.] __memcpy_ssse3
        20.57%           vivi-*  [kernel.kallsyms]       [k] memcpy
        10.20%             Xorg  [unknown]               [.] 0xa7301494
         5.16%           vivi-*  [vivi]                  [k] gen_text.constprop.6
         4.43%             rawv  [vivi]                  [k] gen_twopix
         4.36%           vivi-*  [vivi]                  [k] vivi_fillbuff
         2.42%             rawv  [vivi]                  [k] precalculate_line
         1.33%          swapper  [kernel.kallsyms]       [k] read_hpet
Signed-off-by: NKirill Smelkov <kirr@mns.spb.ru>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

I've noticed that vivi takes a lot of CPU to produce its frames.
For example for 8 devices and 8 simple programs running, where each
captures YUY2 640x480 and displays it to X via SDL, profile timing is as
follows:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    # Samples: 82K of event 'cycles'
    # Event count (approx.): 31551930117
    #
    # Overhead          Command         Shared Object                                                           Symbol
    # ........  ...............  ....................
    #
        49.48%           vivi-*  [vivi]                [k] gen_twopix
        10.79%           vivi-*  [kernel.kallsyms]     [k] memcpy
        10.02%             rawv  libc-2.13.so          [.] __memcpy_ssse3
         8.35%           vivi-*  [vivi]                [k] gen_text.constprop.6
         5.06%             Xorg  [unknown]             [.] 0xa73015f8
         2.32%             rawv  [vivi]                [k] gen_twopix
         1.22%             rawv  [vivi]                [k] precalculate_line
         1.20%           vivi-*  [vivi]                [k] vivi_fillbuff
    (rawv is display program, vivi-* is a combination of vivi-000 through vivi-007)
so a lot of time is spent in gen_twopix() which as the follwing
call-graph profile shows ...
    49.48%           vivi-*  [vivi]                [k] gen_twopix
                     |
                     --- gen_twopix
                        |
                        |--96.30%-- gen_text.constprop.6
                        |          vivi_fillbuff
                        |          vivi_thread
                        |          kthread
                        |          ret_from_kernel_thread
                        |
                         --3.70%-- vivi_fillbuff
                                   vivi_thread
                                   kthread
                                   ret_from_kernel_thread
... is called mostly from gen_text().
If we'll look at gen_text(), in the inner loop, we'll see
    if (chr & (1 << (7 - i)))
            gen_twopix(dev, pos + j * dev->pixelsize, WHITE, (x+y) & 1);
    else
            gen_twopix(dev, pos + j * dev->pixelsize, TEXT_BLACK, (x+y) & 1);
which calls gen_twopix() for every character pixel, and that is very
expensive, because gen_twopix() branches several times.
Now, let's note, that we operate on only two colors - WHITE and
TEXT_BLACK, and that pixel for that colors could be precomputed and
gen_twopix() moved out of the inner loop. Also note, that for black
and white colors even/odd does not make a difference for all supported
pixel formats, so we could stop doing that `odd` gen_twopix() parameter
game.
So the first thing we are doing here is
    1) moving gen_twopix() calls out of gen_text() into vivi_fillbuff(),
       to pregenerate black and white colors, just before printing
       starts.
what we have next is that gen_text's font rendering loop, even with
gen_twopix() calls moved out, was inefficient and branchy, so let's
    2) rewrite gen_text() loop so it uses less variables + unroll char
       horizontal-rendering loop + instantiate 3 code paths for pixelsizes 2,3
       and 4 so that in all inner loops we don't have to branch or make
       indirections (*).
Done all above reworks, for gen_text() we get nice, non-branchy
streamlined code (showing loop for pixelsize=2):
           ?       cmp    $0x2,%eax
           ?     ? jne    26
           ?       mov    -0x18(%ebp),%eax
           ?       mov    -0x20(%ebp),%edi
           ?       imul   -0x20(%ebp),%eax
           ?       movzwl 0x3ffc(%ebx),%esi
      0,08 ?       movzwl 0x4000(%ebx),%ecx
      0,04 ?       add    %edi,%edi
           ?       mov    0x0,%ebx
      0,51 ?       mov    %edi,-0x1c(%ebp)
           ?       mov    %ebx,-0x14(%ebp)
           ?       movl   $0x0,-0x10(%ebp)
           ?       lea    0x20(%edx,%eax,2),%eax
           ?       mov    %eax,-0x18(%ebp)
           ?       xchg   %ax,%ax
      0,04 ? a0:   mov    0x8(%ebp),%ebx
           ?       mov    -0x18(%ebp),%eax
      0,04 ?       movzbl (%ebx),%edx
      0,16 ?       test   %dl,%dl
      0,04 ?     ? je     128
      0,08 ?       lea    0x0(%esi),%esi
      1,61 ? b0:???shl    $0x4,%edx
      1,02 ?    ?  mov    -0x14(%ebp),%edi
      2,04 ?    ?  add    -0x10(%ebp),%edx
      2,24 ?    ?  lea    0x1(%ebx),%ebx
      0,27 ?    ?  movzbl (%edi,%edx,1),%edx
      9,92 ?    ?  mov    %esi,%edi
      0,39 ?    ?  test   %dl,%dl
      2,04 ?    ?  cmovns %ecx,%edi
      4,63 ?    ?  test   $0x40,%dl
      0,55 ?    ?  mov    %di,(%eax)
      3,76 ?    ?  mov    %esi,%edi
      0,71 ?    ?  cmove  %ecx,%edi
      3,41 ?    ?  test   $0x20,%dl
      0,75 ?    ?  mov    %di,0x2(%eax)
      2,43 ?    ?  mov    %esi,%edi
      0,59 ?    ?  cmove  %ecx,%edi
      4,59 ?    ?  test   $0x10,%dl
      0,67 ?    ?  mov    %di,0x4(%eax)
      2,55 ?    ?  mov    %esi,%edi
      0,78 ?    ?  cmove  %ecx,%edi
      4,31 ?    ?  test   $0x8,%dl
      0,67 ?    ?  mov    %di,0x6(%eax)
      5,76 ?    ?  mov    %esi,%edi
      1,80 ?    ?  cmove  %ecx,%edi
      4,20 ?    ?  test   $0x4,%dl
      0,86 ?    ?  mov    %di,0x8(%eax)
      2,98 ?    ?  mov    %esi,%edi
      1,37 ?    ?  cmove  %ecx,%edi
      4,67 ?    ?  test   $0x2,%dl
      0,20 ?    ?  mov    %di,0xa(%eax)
      2,78 ?    ?  mov    %esi,%edi
      0,75 ?    ?  cmove  %ecx,%edi
      3,92 ?    ?  and    $0x1,%edx
      0,75 ?    ?  mov    %esi,%edx
      2,59 ?    ?  mov    %di,0xc(%eax)
      0,59 ?    ?  cmove  %ecx,%edx
      3,10 ?    ?  mov    %dx,0xe(%eax)
      2,39 ?    ?  add    $0x10,%eax
      0,51 ?    ?  movzbl (%ebx),%edx
      2,86 ?    ?  test   %dl,%dl
      2,31 ?    ???jne    b0
      0,04 ?128:   addl   $0x1,-0x10(%ebp)
      4,00 ?       mov    -0x1c(%ebp),%eax
      0,04 ?       add    %eax,-0x18(%ebp)
      0,08 ?       cmpl   $0x10,-0x10(%ebp)
           ?     ? jne    a0
which almost goes away from the profile:
    # cmdline : /home/kirr/local/perf/bin/perf record -g -a sleep 20
    # Samples: 49K of event 'cycles'
    # Event count (approx.): 16799780016
    #
    # Overhead          Command         Shared Object                                                           Symbol
    # ........  ...............  ....................
    #
        27.51%             rawv  libc-2.13.so          [.] __memcpy_ssse3
        23.77%           vivi-*  [kernel.kallsyms]     [k] memcpy
         9.96%             Xorg  [unknown]             [.] 0xa76f5e12
         4.94%           vivi-*  [vivi]                [k] gen_text.constprop.6
         4.44%             rawv  [vivi]                [k] gen_twopix
         3.17%           vivi-*  [vivi]                [k] vivi_fillbuff
         2.45%             rawv  [vivi]                [k] precalculate_line
         1.20%          swapper  [kernel.kallsyms]     [k] read_hpet
i.e. gen_twopix() overhead dropped from 49% to 4% and gen_text() loops
from ~8% to ~4%, and overal cycles count dropped from 31551930117 to
16799780016 which is ~1.9x whole workload speedup.
(*) for RGB24 rendering I've introduced x24, which could be thought as
    synthetic u24 for simplifying the code. That's done because for
    memcpy used for conditional assignment, gcc generates suboptimal code
    with more indirections.
    Fortunately, in C struct assignment is builtin and that's all we
    need from pixeltype for font rendering.
Signed-off-by: NKirill Smelkov <kirr@mns.spb.ru>
Acked-by: NHans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

fixed below checkpatch warnings.
- WARNING: Prefer netdev_err(netdev, ... then dev_err(dev, ... then pr_err(...  to printk(KERN_ERR ...
- WARNING: Prefer netdev_info(netdev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
- WARNING: Prefer netdev_warn(netdev, ... then dev_warn(dev, ... then pr_warn(...  to printk(KERN_WARNING ...
Signed-off-by: NYAMANE Toshiaki <yamanetoshi@gmail.com>
Tested-by: NPeter Senna Tschudin <peter.senna@gmail.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>

Commits e666a44f ("[media] tda18212:
silence compiler warning") and e0e52d4e
("[media] tda18218: silence compiler warning") silenced warnings
equivalent to these:
    drivers/media/tuners/tda18212.c: In function ‘tda18212_attach’:
    drivers/media/tuners/tda18212.c:299:2: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    drivers/media/tuners/tda18218.c: In function ‘tda18218_attach’:
    drivers/media/tuners/tda18218.c:305:2: warning: ‘val’ may be used uninitialized in this function [-Wmaybe-uninitialized]
But in both cases 'val' will still be used uninitialized if the calls
of tda18212_rd_reg() or tda18218_rd_reg() fail. Fix this by only
printing the "chip id" if the calls of those functions were successful.
This allows to drop the uninitialized_var() stopgap measure.
Also stop printing the return values of tda18212_rd_reg() or
tda18218_rd_reg(), as these are not interesting.
Signed-off-by: NPaul Bolle <pebolle@tiscali.nl>
Acked-by: NAntti Palosaari <crope@iki.fi>
Reviewed-by: NAntti Palosaari <crope@iki.fi>
Signed-off-by: NMauro Carvalho Chehab <mchehab@redhat.com>