diff options
| author | Sergei Shtylyov <sergei.shtylyov@cogentembedded.com> | 2018-01-18 17:05:51 +0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@s-opensource.com> | 2018-02-26 18:27:28 +0300 |
| commit | 7f43ff953f4009655a8b19a6f2fd1f665f4d7c2e (patch) | |
| tree | 0833cefc04a9d823e72bf5a8406c9a824ba7abb8 /drivers/media/platform/vsp1/vsp1_lif.c | |
| parent | 06227008670afddd5eb66cc6a85c27fd5e72f41e (diff) | |
| download | linux-7f43ff953f4009655a8b19a6f2fd1f665f4d7c2e.tar.xz | |
media: v4l: vsp1: Fix video output on R8A77970
Commit d455b45f8393 ("v4l: vsp1: Add support for new VSP2-BS, VSP2-DL,
and VSP2-D instances") added support for the VSP2-D found in the R-Car
V3M (R8A77970) but the video output that VSP2-D sends to DU has a greenish
garbage-like line repeated every 8 screen rows. It turns out that R-Car
V3M has the LIF0 buffer attribute register that you need to set to a non-
default value in order to get rid of the output artifacts.
Based on the original (and large) patch by Daisuke Matsushita
<daisuke.matsushita.ns@hitachi.com>.
Fixes: d455b45f8393 ("v4l: vsp1: Add support for new VSP2-BS, VSP2-DL and VSP2-D instances")
[Removed braces, added VI6_IP_VERSION_MASK to improve readabiliy]
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/platform/vsp1/vsp1_lif.c')
| -rw-r--r-- | drivers/media/platform/vsp1/vsp1_lif.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/media/platform/vsp1/vsp1_lif.c b/drivers/media/platform/vsp1/vsp1_lif.c index e6fa16d7fda8..704920753998 100644 --- a/drivers/media/platform/vsp1/vsp1_lif.c +++ b/drivers/media/platform/vsp1/vsp1_lif.c @@ -155,6 +155,18 @@ static void lif_configure(struct vsp1_entity *entity, (obth << VI6_LIF_CTRL_OBTH_SHIFT) | (format->code == 0 ? VI6_LIF_CTRL_CFMT : 0) | VI6_LIF_CTRL_REQSEL | VI6_LIF_CTRL_LIF_EN); + + /* + * On R-Car V3M the LIF0 buffer attribute register has to be set to a + * non-default value to guarantee proper operation (otherwise artifacts + * may appear on the output). The value required by the manual is not + * explained but is likely a buffer size or threshold. + */ + if ((entity->vsp1->version & VI6_IP_VERSION_MASK) == + (VI6_IP_VERSION_MODEL_VSPD_V3 | VI6_IP_VERSION_SOC_V3M)) + vsp1_lif_write(lif, dl, VI6_LIF_LBA, + VI6_LIF_LBA_LBA0 | + (1536 << VI6_LIF_LBA_LBA1_SHIFT)); } static const struct vsp1_entity_operations lif_entity_ops = { |