From: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
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@xxxxxxxxxxx>.
Fixes: d455b45f8393 ("v4l: vsp1: Add support for new VSP2-BS, VSP2-DL and VSP2-D instances")
Signed-off-by: Sergei Shtylyov <sergei.shtylyov@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
[Removed braces, added VI6_IP_VERSION_MASK to improve readabiliy]
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@xxxxxxxxxxxxxxxx>
---
drivers/media/platform/vsp1/vsp1_lif.c | 12 ++++++++++++
drivers/media/platform/vsp1/vsp1_regs.h | 6 ++++++
2 files changed, 18 insertions(+)
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 = {
diff --git a/drivers/media/platform/vsp1/vsp1_regs.h b/drivers/media/platform/vsp1/vsp1_regs.h
index b1912c83a1da..dae0c1901297 100644
--- a/drivers/media/platform/vsp1/vsp1_regs.h
+++ b/drivers/media/platform/vsp1/vsp1_regs.h
@@ -693,6 +693,11 @@
#define VI6_LIF_CSBTH_LBTH_MASK (0x7ff << 0)
#define VI6_LIF_CSBTH_LBTH_SHIFT 0
+#define VI6_LIF_LBA 0x3b0c
+#define VI6_LIF_LBA_LBA0 (1 << 31)
+#define VI6_LIF_LBA_LBA1_MASK (0xfff << 16)
+#define VI6_LIF_LBA_LBA1_SHIFT 16
+
/* -----------------------------------------------------------------------------
* Security Control Registers
*/
@@ -705,6 +710,7 @@
*/
#define VI6_IP_VERSION 0x3f00
+#define VI6_IP_VERSION_MASK (0xffff << 0)
#define VI6_IP_VERSION_MODEL_MASK (0xff << 8)
#define VI6_IP_VERSION_MODEL_VSPS_H2 (0x09 << 8)
#define VI6_IP_VERSION_MODEL_VSPR_H2 (0x0a << 8)
--
Regards,
Laurent Pinchart
