On 07/08/2016 12:43 PM, Niklas Söderlund wrote:
> 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.
I'd rather have a version without the legacy code. You have to assume that
subdevs return correct values otherwise what's the point of the mediabus
formats?
So this is simply an adv7180 bug fix + this r-car fix to stay consistent
with the adv7180.
Regards,
Hans
>
> 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;
>
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