mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
OMAPDSS: DISPC: work-around for errata i631
Errata i631 description: "When in YUV4:2:0 format in 1D burst, the DISPC DMA skips lines when fetching Chroma sampling." Workaround: "If YUV4:2:0-1D burst is required: Set DISPC_VIDp_ATTRIBUTES[22]DOUBLESTRIDE to 0x0 and DISPC_VIDp_ATTRIBUTES[13:12]ROTATION to 0x1 or 0x3" The description is somewhat confusing, but testing has shown that DSS fetches extra rows from memory when using NV12 format in 1D mode. If the memory after the framebuffer is inaccessible, this leads to OCP errors. The driver always uses DOUBLESTRIDE=0 when using 1D mode, so we only need to handle the ROTATION part. The issue exist on all OMAP4 and OMAP5 based DSS IPs. Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
parent
c65b99f046
commit
3397cc6a71
1 changed files with 9 additions and 0 deletions
|
@ -1741,6 +1741,15 @@ static void dispc_ovl_set_rotation_attrs(enum omap_plane plane, u8 rotation,
|
|||
row_repeat = false;
|
||||
}
|
||||
|
||||
/*
|
||||
* OMAP4/5 Errata i631:
|
||||
* NV12 in 1D mode must use ROTATION=1. Otherwise DSS will fetch extra
|
||||
* rows beyond the framebuffer, which may cause OCP error.
|
||||
*/
|
||||
if (color_mode == OMAP_DSS_COLOR_NV12 &&
|
||||
rotation_type != OMAP_DSS_ROT_TILER)
|
||||
vidrot = 1;
|
||||
|
||||
REG_FLD_MOD(DISPC_OVL_ATTRIBUTES(plane), vidrot, 13, 12);
|
||||
if (dss_has_feature(FEAT_ROWREPEATENABLE))
|
||||
REG_FLD_MOD(DISPC_OVL_ATTRIBUTES(plane),
|
||||
|
|
Loading…
Reference in a new issue