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OMAP: DSS2: make 50ms bug-fix sleep optional 

For some unknown reason we may get SYNC_LOST errors from the display
subsystem at initialization time if we don't sleep before resetting the
DSS. See the source (dss.c) for more comments.

However, 50ms is quite long time to sleep, and with some configurations
the SYNC_LOST may never happen, so this patch creates a Kconfig option
to disable the sleep.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2010-06-02 17:31:53 +03:00
parent d792eecd9a
commit f1aafdcd42
2 changed files with 16 additions and 0 deletions
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11
drivers/video/omap2/dss/Kconfig
View File

@ -125,4 +125,15 @@ config OMAP2_DSS_MIN_FCK_PER_PCK
Max FCK is 173MHz, so this doesn't work if your PCK
is very high.
config OMAP2_DSS_SLEEP_BEFORE_RESET
bool "Sleep 50ms before DSS reset"
default y
help
For some unknown reason we may get SYNC_LOST errors from the display
subsystem at initialization time if we don't sleep before resetting
the DSS. See the source (dss.c) for more comments.
However, 50ms is quite long time to sleep, and with some
configurations the SYNC_LOST may never happen, so the sleep can
be disabled here.
endif

5
drivers/video/omap2/dss/dss.c
View File

@ -665,13 +665,18 @@ static int dss_init(void)
* the kernel resets it */
omap_writel(omap_readl(0x48050440) & ~0x3, 0x48050440);
#ifdef CONFIG_OMAP2_DSS_SLEEP_BEFORE_RESET
/* We need to wait here a bit, otherwise we sometimes start to
* get synclost errors, and after that only power cycle will
* restore DSS functionality. I have no idea why this happens.
* And we have to wait _before_ resetting the DSS, but after
* enabling clocks.
*
* This bug was at least present on OMAP3430. It's unknown
* if it happens on OMAP2 or OMAP3630.
*/
msleep(50);
#endif
_omap_dss_reset();