linux-kernel - [PATCH 1/2] drm/exynos: mixer: Fix color format setting

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Date:   Wed, 28 Nov 2018 16:32:11 +0100
From:   Christoph Manszewski <c.manszewski@...sung.com>
To:     dri-devel@...ts.freedesktop.org
Cc:     Christoph Manszewski <c.manszewski@...sung.com>,
        Inki Dae <inki.dae@...sung.com>,
        Joonyoung Shim <jy0922.shim@...sung.com>,
        Seung-Woo Kim <sw0312.kim@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        David Airlie <airlied@...ux.ie>, Kukjin Kim <kgene@...nel.org>,
        Krzysztof Kozlowski <krzk@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Andrzej Hajda <a.hajda@...sung.com>
Subject: [PATCH 1/2] drm/exynos: mixer: Fix color format setting

Fix color format decision based on height(pixels).

According to CEA-861-E:
"High Definition (HD) - A CE video format that, inclusively, has between
720 to 1080 active vertical lines (Vactive) lines per video frame."

Tested on Odroid-U3 with Exynos 4412 CPU, kernel next-20181128
using modetest.

Signed-off-by: Christoph Manszewski <c.manszewski@...sung.com>
---
 drivers/gpu/drm/exynos/exynos_mixer.c | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_mixer.c b/drivers/gpu/drm/exynos/exynos_mixer.c
index e3a4ecbc503b..bcc26c10095a 100644
--- a/drivers/gpu/drm/exynos/exynos_mixer.c
+++ b/drivers/gpu/drm/exynos/exynos_mixer.c
@@ -385,14 +385,9 @@ static void mixer_cfg_rgb_fmt(struct mixer_context *ctx, unsigned int height)
 {
 	u32 val;
 
-	switch (height) {
-	case 480:
-	case 576:
+	if (height < 720) {
 		val = MXR_CFG_RGB601_0_255;
-		break;
-	case 720:
-	case 1080:
-	default:
+	} else {
 		val = MXR_CFG_RGB709_16_235;
 		/* Configure the BT.709 CSC matrix for full range RGB. */
 		mixer_reg_write(ctx, MXR_CM_COEFF_Y,
@@ -402,7 +397,6 @@ static void mixer_cfg_rgb_fmt(struct mixer_context *ctx, unsigned int height)
 			MXR_CSC_CT(-0.102, -0.338,  0.440));
 		mixer_reg_write(ctx, MXR_CM_COEFF_CR,
 			MXR_CSC_CT( 0.440, -0.399, -0.040));
-		break;
 	}
 
 	mixer_reg_writemask(ctx, MXR_CFG, val, MXR_CFG_RGB_FMT_MASK);
-- 
2.7.4