diff options
| -rw-r--r-- | drivers/video/fbdev/omap2/dss/dispc.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/video/fbdev/omap2/dss/dispc.c b/drivers/video/fbdev/omap2/dss/dispc.c index 6b056d0ce187..f4fc77d9d3bf 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) { |