linux-kernel - [PATCH v2 1/4] [media] exynos-gsc: Use 576p instead 720p as a threshold for colorspaces

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Date:   Thu,  9 Feb 2017 17:04:17 -0300
From:   Thibault Saunier <thibault.saunier@....samsung.com>
To:     linux-kernel@...r.kernel.org
Cc:     Mauro Carvalho Chehab <mchehab@...pensource.com>,
        Andi Shyti <andi.shyti@...sung.com>,
        Shuah Khan <shuahkh@....samsung.com>,
        Inki Dae <inki.dae@...sung.com>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Kukjin Kim <kgene@...nel.org>,
        linux-samsung-soc@...r.kernel.org,
        Sylwester Nawrocki <s.nawrocki@...sung.com>,
        linux-media@...r.kernel.org, Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH v2 1/4] [media] exynos-gsc: Use 576p instead 720p as a threshold for colorspaces

From: Javier Martinez Canillas <javier@....samsung.com>

The media documentation says that the V4L2_COLORSPACE_SMPTE170M colorspace
should be used for SDTV and V4L2_COLORSPACE_REC709 for HDTV. But drivers
don't agree on the display resolution that should be used as a threshold.

Some drivers set V4L2_COLORSPACE_REC709 for 720p and higher while others
set V4L2_COLORSPACE_REC709 for anything higher than 576p. Newers drivers
use the latter and that also matches what user-space multimedia programs
do (i.e: GStreamer), so change the driver logic to be aligned with this.

Also, check for the resolution in G_FMT instead unconditionally setting
the V4L2_COLORSPACE_REC709 colorspace.

Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
---
 drivers/media/platform/exynos-gsc/gsc-core.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/exynos-gsc/gsc-core.c b/drivers/media/platform/exynos-gsc/gsc-core.c
index cbb03768f5d7..2beb43401987 100644
--- a/drivers/media/platform/exynos-gsc/gsc-core.c
+++ b/drivers/media/platform/exynos-gsc/gsc-core.c
@@ -445,7 +445,7 @@ int gsc_try_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
 
 	pix_mp->num_planes = fmt->num_planes;
 
-	if (pix_mp->width >= 1280) /* HD */
+	if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
 		pix_mp->colorspace = V4L2_COLORSPACE_REC709;
 	else /* SD */
 		pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
@@ -492,7 +492,10 @@ int gsc_g_fmt_mplane(struct gsc_ctx *ctx, struct v4l2_format *f)
 	pix_mp->height		= frame->f_height;
 	pix_mp->field		= V4L2_FIELD_NONE;
 	pix_mp->pixelformat	= frame->fmt->pixelformat;
-	pix_mp->colorspace	= V4L2_COLORSPACE_REC709;
+	if (pix_mp->width > 720 && pix_mp->height > 576) /* HD */
+		pix_mp->colorspace = V4L2_COLORSPACE_REC709;
+	else /* SD */
+		pix_mp->colorspace = V4L2_COLORSPACE_SMPTE170M;
 	pix_mp->num_planes	= frame->fmt->num_planes;
 
 	for (i = 0; i < pix_mp->num_planes; ++i) {
-- 
2.11.1