Move run_test() from omap_dss_device to omap_dss_driver.

This is part of a larger patch-set, which moves the control from omapdss
driver to the display driver.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Remove performance measurement for auto-update. Auto-update and thus
performance measurement cannot be supported after the driver change where
the control is moved to display drivers.

This is part of a larger patch-set, which moves the control from omapdss
driver to the display driver.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Physical DSI bus is protected by a mutex. This patch changed the mutex to
a semaphore, so that we can lock and unlock the bus_lock from different
threads.

This is needed as the update process is started by user space program, and
thus the lock is acquired in that context, but the lock can be released in
different context, a work thread via irq.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

After changing the selection of DSI and DISPC clock source the users of
get_dsi/dispc_clk_source() functions were left unchanged.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

It was not used.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Instead of configuring only VC0 to be usable, configure all four VCs
similarly. This is needed to utilize the other VCs.

Setting the FIFO sizes evenly for all VCs, regardless of how many VCs are
actually used, is not optimal. However, this affects only cases when
larger amounts of data are written or read via L4, meaning that normal use
cases are not affected.

At some point this could be optimized better to suit different use cases.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Rename and export dsi_vc_enable_hs() so that the display drivers can
control the mode of the DSI link.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Add helper functions for most common DCS read and write operations.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Helper function to clean up the checking of the bus lock.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

dss_select_clk_source() was rather confusing. Selecting the source with
enums is much clearer.

The clk source selection is also stored into memory, so that we know what
is the selected source, even when clocks are off. This is important during
setup, as we need to what clocks to turn on before the clocks are turned
on.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

It looks like on OMAP3 some DSS pins need VDDS_DSI to function properly.

This has not been confirmed from TI, but looking at figure 15-1 "Display
subsystem highlight" from the TRM, some data pins come near the DSI and SDI
blocks. This is not very hard evidence, but the fact remains that with the
power on, pixels are ok, and with the power off, pixels are not ok.

It may also be that VDDS_SDI is needed to power some pins, but as normally
both VDDS_SDI and VDDS_DSI come from the same power source, this hasn't
been shown.

It seems that a single driver can only get a regulator once. This patch
solves it by getting all the required regulators in one place, and from
which the submodules then get the regulators they need.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Loops checking for certain condition were rather inconsistent.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>
Reported-by: NJuha Leppanen <juha_motorsportcom@luukku.com>

DSI driver didn't check if the panel driver actually implements
enable_te().
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Collect interrupt statistics, printable via debugfs:

debugfs/omapdss/dispc_irq
debugfs/omapdss/dsi_irq

The counters are reset when printed.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

- dsi_vc_send_short() needs to use dest_per for the peripheral id
- dsi_vc_send_null() was always using channel id 0
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>

DSI (Display Serial Interface) driver implements MIPI DSI interface.
Signed-off-by: NTomi Valkeinen <tomi.valkeinen@nokia.com>