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| author | Lajos Molnar <molnar@ti.com> | 2011-07-27 20:57:10 -0500 |
|---|---|---|
| committer | Erik Gilling <konkers@android.com> | 2011-07-28 11:12:40 -0700 |
| commit | f9ace53d7c88c687d3ca7d8f73a1ce3022bf09cb (patch) | |
| tree | d4209ac2c6b738b95d940d4e779188113e29f3d9 | |
| parent | 74ee24a54b3cb17fce170ee1d8b6c60df980b506 (diff) | |
| download | kernel_samsung_tuna-f9ace53d7c88c687d3ca7d8f73a1ce3022bf09cb.zip kernel_samsung_tuna-f9ace53d7c88c687d3ca7d8f73a1ce3022bf09cb.tar.gz kernel_samsung_tuna-f9ace53d7c88c687d3ca7d8f73a1ce3022bf09cb.tar.bz2 | |
OMAP:DSS: Fix buffer underflow errors
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 <molnar@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 4d03fd4..a676cf1 100644 --- a/drivers/video/omap2/dss/dispc.c +++ b/drivers/video/omap2/dss/dispc.c @@ -1148,6 +1148,9 @@ void dispc_setup_plane_fifo(enum omap_plane plane, u32 low, u32 high) hi_start, hi_end), low, high); + /* 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)); |