A recent bugfix to adv7180 brought to light that the rcar-vin driver are
looking for the wrong media bus format. It was looking for a YUVU format
but then expecting UYVY data. The bugfix for adv7180 will break the
usage of rcar-vin together with a adv7180 as found on Renesas R-Car2
Koelsch boards for example.
This patch fix the rcar-vin driver to look for the correct UYVU formats
and adds a legacy mode. The legacy mode is needed since I don't know if
other devices provide a incorrect media bus format and I don't want to
break any working configurations. Hopefully the legacy mode can be
removed sometime in the future.
Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
drivers/media/platform/rcar-vin/rcar-core.c | 39 +++++++++++++++++++++++++++--
drivers/media/platform/rcar-vin/rcar-dma.c | 4 +--
2 files changed, 39 insertions(+), 4 deletions(-)
diff --git a/drivers/media/platform/rcar-vin/rcar-core.c
b/drivers/media/platform/rcar-vin/rcar-core.c
index 4b2007b..481d82a 100644
--- a/drivers/media/platform/rcar-vin/rcar-core.c
+++ b/drivers/media/platform/rcar-vin/rcar-core.c
@@ -37,6 +37,7 @@ static int rvin_mbus_supported(struct rvin_dev *vin)
struct v4l2_subdev_mbus_code_enum code = {
.which = V4L2_SUBDEV_FORMAT_ACTIVE,
};
+ bool found;
sd = vin_to_source(vin);
@@ -45,8 +46,8 @@ static int rvin_mbus_supported(struct rvin_dev *vin)
code.index++;
switch (code.code) {
case MEDIA_BUS_FMT_YUYV8_1X16:
- case MEDIA_BUS_FMT_YUYV8_2X8:
- case MEDIA_BUS_FMT_YUYV10_2X10:
+ case MEDIA_BUS_FMT_UYVY8_2X8:
+ case MEDIA_BUS_FMT_UYVY10_2X10:
case MEDIA_BUS_FMT_RGB888_1X24:
vin->source.code = code.code;
vin_dbg(vin, "Found supported media bus format: %d\n",
@@ -57,6 +58,40 @@ static int rvin_mbus_supported(struct rvin_dev *vin)
}
}
+ /*
+ * Older versions where looking for the wrong media bus format.
+ * It where looking for a YUVY format but then treated it as a
+ * UYVY format. This was not noticed since atlest one subdevice
+ * used for testing (adv7180) reported a YUVY media bus format
+ * but provided UYVY data. There might be other unknown subdevices
+ * which also do this, to not break compatibility try to use them
+ * in legacy mode.
+ */
+ found = false;
+ code.index = 0;
+ while (!v4l2_subdev_call(sd, pad, enum_mbus_code, NULL, &code)) {
+ code.index++;
+ switch (code.code) {
+ case MEDIA_BUS_FMT_YUYV8_2X8:
+ vin->source.code = MEDIA_BUS_FMT_UYVY8_2X8;
+ found = true;
+ break;
+ case MEDIA_BUS_FMT_YUYV10_2X10:
+ vin->source.code = MEDIA_BUS_FMT_UYVY10_2X10;
+ found = true;
+ break;
+ default:
+ break;
+ }
+
+ if (found) {
+ vin_err(vin,
+ "media bus %d not supported, trying legacy mode
%d\n",
+ code.code, vin->source.code);
+ return true;
+ }
+ }
+
return false;
}
diff --git a/drivers/media/platform/rcar-vin/rcar-dma.c
b/drivers/media/platform/rcar-vin/rcar-dma.c
index dad3b03..0836b15 100644
--- a/drivers/media/platform/rcar-vin/rcar-dma.c
+++ b/drivers/media/platform/rcar-vin/rcar-dma.c
@@ -169,7 +169,7 @@ static int rvin_setup(struct rvin_dev *vin)
vnmc |= VNMC_INF_YUV16;
input_is_yuv = true;
break;
- case MEDIA_BUS_FMT_YUYV8_2X8:
+ case MEDIA_BUS_FMT_UYVY8_2X8:
/* BT.656 8bit YCbCr422 or BT.601 8bit YCbCr422 */
vnmc |= vin->mbus_cfg.type == V4L2_MBUS_BT656 ?
VNMC_INF_YUV8_BT656 : VNMC_INF_YUV8_BT601;
@@ -178,7 +178,7 @@ static int rvin_setup(struct rvin_dev *vin)
case MEDIA_BUS_FMT_RGB888_1X24:
vnmc |= VNMC_INF_RGB888;
break;
- case MEDIA_BUS_FMT_YUYV10_2X10:
+ case MEDIA_BUS_FMT_UYVY10_2X10:
/* BT.656 10bit YCbCr422 or BT.601 10bit YCbCr422 */
vnmc |= vin->mbus_cfg.type == V4L2_MBUS_BT656 ?
VNMC_INF_YUV10_BT656 : VNMC_INF_YUV10_BT601;
--
2.9.0
--
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