Export DISPC functions.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

This patch adds a new function, dispc_ovl_check(), which can be used to
verify scaling configuration for an overlay. The function gets both the
overlay and overlay manager as parameters, so that the caller does not
need to configure the hardware before using this function.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The whole dispc irq handling system we currently have is only needed for
compat layer, and thus can be moved from dispc.c to the compat layer.

This is quite straigtforward, but we need to add new dispc functions to
request and free the actual hardware irq: dispc_request_irq() and
dispc_free_irq().
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

We have two functions to wait for a dispc interrupt:

int omap_dispc_wait_for_irq_timeout(u32 irqmask, unsigned long timeout);
int omap_dispc_wait_for_irq_interruptible_timeout(u32 irqmask,

Of these, the former is not used at all, and can be removed. The latter
is only used by the compat layer, and can be moved to the compat layer
code.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_mgr_enable_sync and dispc_mgr_disable_sync are only used with the
compat mode. Non-compat will use the simpler enable and disable
functions.

This patch moves the synchronous enable/disable code to the compat
layer. A new file is created, dispc-compat.c, which contains low level
dispc compat code (versus apply.c, which contains slightly higher level
compat code).
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

When enabling a hwmod, omap_hwmod refers to the register mentioned in the
hwmod struct's member 'prcm.omap4.context_offs' to see whether context was
lost or not. It increments the context lost count for the hwmod and then clears
the register.

All the DSS hwmods have the same register(RM_DSS_DSS_CONTEXT) as context_offs.
When DSS is enabled, the first hwmod to be enabled is the "dss_core" hwmod since
it's corresponding platform device is the parent platform device("omapdss_dss").
The dss_core hwmod updates it's context lost count correctly and clears the
register. When the hwmods corresponding to the children platform devices are
enabled, they see that the register is clear, and don't increment their context
lost count. Therefore, all the children platform devices never report a loss in
context.

The DISPC driver currently gets the context lost count for DSS power domain from
it's corresponding platform device instance("omapdss_dispc"). The DISPC platform
device is one of the child devices, and it's corresponding hwmod("dss_dispc")
doesn't report the context lost count correctly.

Modify dss_get_ctx_loss_count() such that it always takes the "omapdss_dss"
platform device as it's input, move the function to dss.c so that it has access
to that platform device.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

In order to make the scaling calculations independent of the current
hardware configuration (e.g. which manager is connected to this output),
we need to change the calc funcs to get all the variables needed for the
calculations via parameters.

This patch changes dispc_ovl_calc_scaling to get pclk and lclk as
parameters.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

In order to make the scaling calculations independent of the current
hardware configuration (e.g. which manager is connected to this output),
we need to change the calc funcs to get all the variables needed for the
calculations via parameters.

This patch changes calc_scaling to get pclk and lclk as parameters.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

In order to make the scaling calculations independent of the current
hardware configuration (e.g. which manager is connected to this output),
we need to change the calc funcs to get all the variables needed for the
calculations via parameters.

This patch changes check_horiz_timing_omap3() to get pclk and lclk as
parameters.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

In order to make the scaling calculations independent of the current
hardware configuration (e.g. which manager is connected to this output),
we need to change the calc funcs to get all the variables needed for the
calculations via parameters.

This patch changes calc_core_clk() function to get pclk as a parameter.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Change the dispc_plane_pclk_rate and dispc_plane_lclk_rate functions to
return 0 if the given plane is the writeback plane. The clocks are not
valid for WB, but returning 0 from these functions instead of running
into BUG() will simplify the code that uses these functions.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_mgr_go() should never be called with manager output disabled or if
the GO bit is already set. Change the current silent returns to
WARN_ONs.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Instead of doing direct register reads/writes, dispc_wb_enable() and
dispc_wb_is_enabled() functions can use the common overlay functions to
set and check the enable bit.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

WB will not be used with compat-mode, i.e. from omapfb. This means we
don't need the current complex dispc_wb_enable function, but can have a
simple register write version of the function.

This patch removes all the extra code from dispc_wb_enable()
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_mgr_disable_digit_out() needs to wait until the DIGIT output is
turned off. This is done with either VSYNC irq on OMAP2/3 and
FRAMEDONETV on OMAP4+. It currently uses a rather hacky way to decide
what irq to use.

This patch changes dispc_mgr_disable_digit_out to use
dispc_mgr_get_framedone_irq to find out if there's framedone irq on this
SoC, and if not, uses VSYNC.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

OMAP2/3 do not have FRAMEDONETV irq, but later omaps do. We currently
always return 0 from dispc_mgr_get_framedone_irq() for TV output to be
compatible with OMAP2/3.

This patch implements "no_framedone_tv" dispc-feature that is used in
dispc_mgr_get_framedone_irq to return either 0 for OMAP2/3, or the
correct IRQ number for FRAMEDONETV on OMAP4+.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Add a dispc_features struct for OMAP5. Previously, OMAP5 used the same
struct as OMAP4. The new struct for OMAP5 contains the updated register
field offset and maximum limit for overlay manager width and height.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The overlay manager width and height vary in OMAP5 from previous OMAPs
in terms of maximum limit and register field positions. Add parameters
in dispc_features for these. Also remove params related to manager width
and height from dss_features, as we want to maintain a feature list for
individual IPs.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

When calculating row and pixel increments for graphics and video pipes, we need
to consider the dimensions of the input frame to know how to read from the
buffer. Hence, we need to calculate these parameters from the input to the
pipeline.

For writeback, the row and pixel increments need to be calculated based on the
output of the writeback pipeline, i.e, the dimensions of the frame after
scaling. Ensure that dispc driver uses values of out_width and out_height when
calling calc_dma/calc_tiler_rotation_offset.

For graphics and video pipes, the original code passed the original height as
frame_height to calc_dma_rotation_offset, and not the predecimated height. This
is left as it is for now. We need to figure out why pre decimated height isn't
needed.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Since writeback writes to a buffer instead of reading from one, predecimation
doesn't make sense for it. Configure the width and height predecimation limits
to 1 if the plane is writeback.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_ovl_calc_scaling_44xx() doesn't work correctly for writeback. There are
two issues with it:

- the function tries to calculate pixel clock for the input plane using
  dispc_plane_pclk_rate(), calling this with writeback as input plane results in
  a BUG(), this function shouldn't be called for writeback at all. Fix this by
  calculating pixel clock only when we are not in mem to mem mode.

- the maximum input_width is the product of the downscale ratio supported and
  the and the given output_width. This was calculated incorrectly by dividing
  output_width with maxdownscale. Fix this.
Signed-off-by: NArchit Taneja <archit@ti.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Fix sparse warning:

drivers/video/omap2/dss/dispc.c:3320:6: warning: symbol
'dispc_dump_irqs' was not declared. Should it be static?
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>
Reported-by: NFengguang Wu <fengguang.wu@intel.com>

The return value of wait_for_completion_timeout() is always
>= 0 with unsigned int type.

So the condition "ret < 0" or "ret >= 0" is pointless.
Signed-off-by: Nliu chuansheng <chuansheng.liu@intel.com>
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

check_horiz_timing_omap3() has a variable named 'DS'. i386 uses DS name
for something else, causing a compilation error. As 'DS' is not a very
good local variable name in the first place, let's change it to 'ds',
fixing the issue.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The dispc error handler tries to "fix" issues by disabling and enabling
panel. This is problematic, as we're trying to remove the dependency
from omapdss to the omap_dss_devices. It's also racy, and doesn't really
fix anything.

This patch removes the use of omap_dss_device from the error handler,
and just disables and enables the associated overlay manager. This
should produce similar results as the previous solution, without using
dssdev.

However, the error handling is still horrible. But the problem boils
down to one question, to which I don't have a clear answer: what to do
when a HW error happens?
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The dispc's error handler has a loop inside another loop, and both use
the same loop variable. This is clearly wrong, and this patch makes a
new variable for the inner loop.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

DISPC irqs need to be handled from the compat layer and also in the
future by the omapdrm. To make this possible, this patchs adds a set of
helper functions, so that the irqs can be managed without direct
register reads/writes.

The following functions are added, and all the current direct reg
reads/writes are changed to use these.

u32 dispc_read_irqstatus(void);
void dispc_clear_irqstatus(u32 mask);
u32 dispc_read_irqenable(void);
void dispc_write_irqenable(u32 mask);
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Add new dispc function, dispc_ovl_enabled(). This returns if the overlay
enable bit is set in the registers.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

We need a low level manager-enable function for omapdrm. We have that
function as dispc internal func, _enable_mgr_out().

This patch exposes that function, and renames it to dispc_mgr_enable().
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The current dispc_mgr_enable/disable function are blocking, and do a bit
too much for omapdrm. We'll expose new enable & disable functions that
will just set the bits in the registers in the following patches.

This patch renames the current functions to *_sync, to make it clear
that they are blocking, and also to free up the dispc_mgr_enable/disable
names for these new functions.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Use dss_feat_get_num_ovls() in dispc.c instead of
omap_dss_get_num_overlays() to remove the dependency to overlay.c. Note
that we still have uses of omap_dss_get_num_overlays() in dispc.c, but
these will be moved out in the future patches.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_mgr_lclk_rate() cannot currently be called with DIGIT channel
parameter, even if dispc_ovl_lclk_rate() can. Fix this by making
dispc_mgr_lclk_rate() handle DIGIT channel also.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

The output drivers get the omapdss hw version from the platform data for
their respective output device. This doesn't work with DT, as there's no
platform data for them.

Add a new function, omapdss_get_version(), which returns the dss version
from the core device, which will have platform data on DT also. The
function is exported so that users of omapdss can also use it.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

We currently have a single function to enable and disable the manager
output for LCD and DIGIT. The functions are a bit complex, as handling
both enable and disable require some extra steps to ensure that the
output is enabled or disabled properly without errors before exiting the
function.

The code can be made simpler to understand by splitting the functions
into separate enable and disable functions. We'll also clean up the
comments and some parameter names at the same time.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Add function that returns the sync lost irq mask for the given channel.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc.c's functions to enable LCD and DIGIT outputs can be cleaned up a
bit by using common functions to set the enable bit and to check if the
output is enabled.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

dispc_ovl_setup() uses struct omap_overlay to get the caps for the
overlay. We can change the code to get the caps directly from dss
features, thus removing the dependency to struct omap_overlay.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Dispc has a bunch of functions used to configure output related
parameters:

- dispc_mgr_set_io_pad_mode
- dispc_mgr_enable_stallmode
- dispc_mgr_enable_fifohandcheck
- dispc_mgr_set_clock_div
- dispc_mgr_set_tft_data_lines
- dispc_lcd_enable_signal_polarity
- dispc_mgr_set_lcd_type_tft

These are all called together, and the configuration values are taken
from struct dss_lcd_mgr_config.

Instead of exposing those individual dispc functions, create a new one,
dispc_mgr_set_lcd_config(), which is used to configure the above
parameters from values in struct dss_lcd_mgr_config.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

Add consts to dispc function parameters which do not modify the passed
structs.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>

When compiling on x86 we get following warnings:

warning: field width specifier ‘*’ expects argument of type ‘int’, but
argument 5 has type ‘size_t’ [-Wformat]

Fix these by casting the size_t to int.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@ti.com>