diff options
| author | Lajos Molnar <lajos@ti.com> | 2011-07-27 20:57:10 -0500 |
|---|---|---|
| committer | Andy Green <andy.green@linaro.org> | 2012-08-01 23:25:35 +0800 |
| commit | 16a2aa2aecd500010e5c7d9cc19be0d5ef24f8ce (patch) | |
| tree | 850e9a7e39063db7b9b1336faad75b341a3abbdc | |
| parent | d93b6dd3a1b8aeb8c5d4fd46ff98bfa2b7bac9bf (diff) | |
OMAPDSS: DISPC: Fix buffer underflow err on downscaling
When downscaling heavily, FIFO buffers may underflow at the first
line. Set DMA preload value to the high threshold to avoid this.
Change-Id: Ic791f48a252d82b2ba514f16c9e824d25e96fa44
Signed-off-by: Lajos Molnar <lajos@ti.com>
Signed-off-by: Varadarajan, Charulatha <charu@ti.com>
| -rw-r--r-- | drivers/video/omap2/dss/dispc.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/video/omap2/dss/dispc.c b/drivers/video/omap2/dss/dispc.c index 157826153d9..486ae071e19 100644 --- a/drivers/video/omap2/dss/dispc.c +++ b/drivers/video/omap2/dss/dispc.c @@ -1073,6 +1073,9 @@ void dispc_ovl_set_fifo_threshold(enum omap_plane plane, u32 low, u32 high) hi_start, hi_end) * unit, low * unit, high * unit); + /* preload to high threshold to avoid FIFO underflow */ + dispc_write_reg(DISPC_OVL_PRELOAD(plane), min(high, 0xfffu)); + dispc_write_reg(DISPC_OVL_FIFO_THRESHOLD(plane), FLD_VAL(high, hi_start, hi_end) | FLD_VAL(low, lo_start, lo_end)); |