提交 · 7b44cf2c15f81caf5c3a4ac59f0677edd64b9aeb · openeuler / Kernel

13 11月, 2012 3 次提交

ARM: OMAP: Fix timer posted mode support · 7b44cf2c

由 Jon Hunter 提交于 7月 06, 2012

Currently the dmtimer posted mode is being enabled when the function
omap_dm_timer_enable_posted() is called. This function is only being called
for OMAP1 timers and OMAP2+ timers that are being used as system timers. Hence,
for OMAP2+ timers that are NOT being used as a system timer, posted mode is
not enabled but the "timer->posted" variable is still set (incorrectly) in
the omap_dm_timer_prepare() function.

This is a regression introduced by commit 3392cdd3 (ARM: OMAP: dmtimer:
switch-over to platform device driver) which was before the
omap_dm_timer_enable_posted() function was introduced. Although this is a
regression from the original code it only impacts performance and so is not
needed for stable.
Signed-off-by: NJon Hunter <jon-hunter@ti.com>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>

7b44cf2c

ARM: OMAP3+: Implement timer workaround for errata i103 and i767 · bfd6d021

由 Jon Hunter 提交于 9月 27, 2012

Errata Titles:
i103: Delay needed to read some GP timer, WD timer and sync timer
      registers after wakeup (OMAP3/4)
i767: Delay needed to read some GP timer registers after wakeup (OMAP5)

Description (i103/i767):
If a General Purpose Timer (GPTimer) is in posted mode
(TSICR [2].POSTED=1), due to internal resynchronizations, values read in
TCRR, TCAR1 and TCAR2 registers right after the timer interface clock
(L4) goes from stopped to active may not return the expected values. The
most common event leading to this situation occurs upon wake up from
idle.

GPTimer non-posted synchronization mode is not impacted by this
limitation.

Workarounds:
1). Disable posted mode
2). Use static dependency between timer clock domain and MPUSS clock
    domain
3). Use no-idle mode when the timer is active

Workarounds #2 and #3 are not pratical from a power standpoint and so
workaround #1 has been implemented. Disabling posted mode adds some CPU
overhead for configuring and reading the timers as the CPU has to wait
for accesses to be re-synchronised within the timer. However, disabling
posted mode guarantees correct operation.

Please note that it is safe to use posted mode for timers if the counter
(TCRR) and capture (TCARx) registers will never be read. An example of
this is the clock-event system timer. This is used by the kernel to
schedule events however, the timers counter is never read and capture
registers are not used. Given that the kernel configures this timer
often yet never reads the counter register it is safe to enable posted
mode in this case. Hence, for the timer used for kernel clock-events,
posted mode is enabled by overriding the errata for devices that are
impacted by this defect.

For drivers using the timers that do not read the counter or capture
registers and wish to use posted mode, can override the errata and
enable posted mode by making the following function calls.

	__omap_dm_timer_override_errata(timer, OMAP_TIMER_ERRATA_I103_I767);
	__omap_dm_timer_enable_posted(timer);

Both dmtimers and watchdogs are impacted by this defect this patch only
implements the workaround for the dmtimer. Currently the watchdog driver
does not read the counter register and so no workaround is necessary.

Posted mode will be disabled for all OMAP2+ devices (including AM33xx)
using a GP timer as a clock-source timer to guarantee correct operation.
This is not necessary for OMAP24xx devices but the default clock-source
timer for OMAP24xx devices is the 32k-sync timer and not the GP timer
and so should not have any impact. This should be re-visited for future
devices if this errata is fixed.

Confirmed with Vaibhav Hiremath that this bug also impacts AM33xx
devices.
Signed-off-by: NJon Hunter <jon-hunter@ti.com>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>

bfd6d021

ARM: OMAP: Add DMTIMER definitions for posted mode · 971d0254

由 Jon Hunter 提交于 9月 27, 2012

For OMAP2+ devices, when using DMTIMERs for system timers (clock-events and
clock-source) the posted mode configuration of the timers is used. To allow
the compiler to optimise the functions for configuring and reading the system
timers, the posted flag variable is hard-coded with the value 1. To make it
clear that posted mode is being used add some definitions so that it is more
readable.
Signed-off-by: NJon Hunter <jon-hunter@ti.com>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>

971d0254

10 11月, 2012 4 次提交
- T
  
  Merge branch 'omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3' into omap-for-v3.8/dt · d308ba50
  由 Tony Lindgren 提交于 11月 09, 2012
  
  d308ba50
- T
  
  Merge branch 'linus' into omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3 · edf8dde3
  由 Tony Lindgren 提交于 11月 09, 2012
  
  edf8dde3
- T
  Merge branch 'omap-for-v3.8/cleanup-headers-prepare-multiplatform-v3' into omap-for-v3.8/dt · f56f52e0
  由 Tony Lindgren 提交于 11月 09, 2012
```
Conflicts:
	arch/arm/plat-omap/dmtimer.c

Resolved as suggested by Jon Hunter.
```
  f56f52e0
- T
  Merge branch 'for_3.8/dts_part2' of... · 84fbd2b8
  由 Tony Lindgren 提交于 11月 09, 2012
```
Merge branch 'for_3.8/dts_part2' of git://git.kernel.org/pub/scm/linux/kernel/git/bcousson/linux-omap-dt into omap-for-v3.8/dt
```
  84fbd2b8
07 11月, 2012 7 次提交

usb: musb: dsps: dt binding - add resources, example · 5a2bc4c6

由 Afzal Mohammed 提交于 11月 06, 2012

OMAP2+ family of devices are now obtaining resources via DT, earlier
it was obtained from hwmod. Update binding document accrodingly, while
at it add example.
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Reviewed-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

5a2bc4c6

ARM: dts: omap4-sdp: Add pinmux configuration for HDMI · 347bf48f

由 Ricardo Neri 提交于 11月 05, 2012

Add the pinmux configuration for HDMI and TPD12S015A. Configure the
gpios for the TPD12S015A and SDA, SCL and CEC for HDMI.
Signed-off-by: NRicardo Neri <ricardo.neri@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

347bf48f

ARM: dts: omap4-panda: Add pinmux configuration for HDMI · 0d9250c4

由 Ricardo Neri 提交于 11月 05, 2012

Add the pinmux configuration for HDMI and TPD12S015A. Configure the
gpios for the TPD12S015A and SDA, SCL and CEC for HDMI.
Signed-off-by: NRicardo Neri <ricardo.neri@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

0d9250c4

T

Merge branch 'dev-dt-timer' of github.com:jonhunter/linux into omap-for-v3.8/dt · 2580390c
由 Tony Lindgren 提交于 11月 06, 2012

2580390c

Merge branch 'for_3.8/dts' of... · ad325255

由 Tony Lindgren 提交于 11月 06, 2012

Merge branch 'for_3.8/dts' of git://git.kernel.org/pub/scm/linux/kernel/git/bcousson/linux-omap-dt into omap-for-v3.8/dt

ad325255

ARM: OMAP: Remove omap_init_consistent_dma_size() · 6ba54ab4

由 Tomi Valkeinen 提交于 11月 02, 2012

The only thing omap_init_consistent_dma_size() does is increase the
consistent DMA size if CONFIG_FB_OMAP_CONSISTENT_DMA_SIZE is defined.
Increasing the consistent DMA size should no longer be needed with CMA
in place.

This patch removes omap_init_consistent_dma_size() and also
arch/arm/mach-omap2/io.c:omap_common_init_early() which becomes an empty
function.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Acked-by: NSantosh Shilimkar <santosh.shilimkar@ti.com>
[tony@atomide.com: updated for moved dma.h]
Signed-off-by: NTony Lindgren <tony@atomide.com>

6ba54ab4

ARM: dts: Makefile: Add the am335x-evmsk target in dtbs list · 7340dd53

由 Benoit Cousson 提交于 11月 06, 2012

The EVMSK was not built with the 'make dtbs' command.
Add the missing entry in the dts Makefile.
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

7340dd53

06 11月, 2012 14 次提交

ARM: dts: AM33XX: Add usbss node · 35b47fbb

由 Ajay Kumar Gupta 提交于 11月 06, 2012

Device tree node for usbss on AM33XX. There are two musb
controllers on am33xx platform so have port0-mode and
port1-mode data.
Signed-off-by: NAjay Kumar Gupta <ajay.gupta@ti.com>
Signed-off-by: NSanthapuri, Damodar <damodar.santhapuri@ti.com>
Signed-off-by: NRavi Babu <ravibabu@ti.com>
[afzal@ti.com: reg & interrupt property addition]
Signed-off-by: NAfzal Mohammed <afzal@ti.com>
Reviewed-by: NFelipe Balbi <balbi@ti.com>
Signed-off-by: NBenoit Cousson <b-cousson@ti.com>

35b47fbb

ARM: dts: AM33XX: Add push-buttons device tree data to am335x-evmsk · 00834b78