From fe59e5cf4abb922d37caea2ced6331cce48fb8b8 Mon Sep 17 00:00:00 2001 From: Tomi Valkeinen Date: Wed, 19 Nov 2014 12:50:16 +0200 Subject: OMAPDSS: workaround for MFLAG + NV12 issue It was found that having two displays enabled and having an NV12 overlay on one of the displays will cause underflows/synclosts. Debugging this pointed to some issue with MFLAG. It is unclear why this issue is happening, but it looks like there is a HW bug related to MFLAG and FIFO management. Disabling MFLAG makes this issue go away, but then we lose the benefit of MFLAG. Also forcing MFLAG always on makes the issue go away. Also, using certain values for MFLAG_START, MFLAG thresholds and PRELOAD makes the issue go away, but there was no obvious logic to which values work and which don't. As a workaround until more information about this is found, force MFLAG always on to make NV12 usable. Signed-off-by: Tomi Valkeinen --- drivers/video/fbdev/omap2/dss/dispc.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'drivers/video') diff --git a/drivers/video/fbdev/omap2/dss/dispc.c b/drivers/video/fbdev/omap2/dss/dispc.c index 6b056d0..f4fc77d 100644 --- a/drivers/video/fbdev/omap2/dss/dispc.c +++ b/drivers/video/fbdev/omap2/dss/dispc.c @@ -1328,8 +1328,18 @@ static void dispc_init_mflag(void) { int i; + /* + * HACK: NV12 color format and MFLAG seem to have problems working + * together: using two displays, and having an NV12 overlay on one of + * the displays will cause underflows/synclosts when MFLAG_CTRL=2. + * Changing MFLAG thresholds and PRELOAD to certain values seem to + * remove the errors, but there doesn't seem to be a clear logic on + * which values work and which not. + * + * As a work-around, set force MFLAG to always on. + */ dispc_write_reg(DISPC_GLOBAL_MFLAG_ATTRIBUTE, - (2 << 0) | /* MFLAG_CTRL = enable */ + (1 << 0) | /* MFLAG_CTRL = force always on */ (0 << 2)); /* MFLAG_START = disable */ for (i = 0; i < dss_feat_get_num_ovls(); ++i) { -- cgit v1.1