linux-kernel - [PATCH v2] drm/msm/dp: correct configure Colorimetry Indicator Field at MISC0

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Message-ID: <1705514068-22394-1-git-send-email-quic_khsieh@quicinc.com>
Date: Wed, 17 Jan 2024 09:54:28 -0800
From: Kuogee Hsieh <quic_khsieh@...cinc.com>
To: <dri-devel@...ts.freedesktop.org>, <robdclark@...il.com>,
        <sean@...rly.run>, <swboyd@...omium.org>, <dianders@...omium.org>,
        <vkoul@...nel.org>, <daniel@...ll.ch>, <airlied@...il.com>,
        <agross@...nel.org>, <dmitry.baryshkov@...aro.org>,
        <andersson@...nel.org>
CC: Kuogee Hsieh <quic_khsieh@...cinc.com>, <quic_abhinavk@...cinc.com>,
        <quic_jesszhan@...cinc.com>, <quic_sbillaka@...cinc.com>,
        <marijn.suijten@...ainline.org>, <freedreno@...ts.freedesktop.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] drm/msm/dp: correct configure Colorimetry Indicator Field at MISC0

MSA MISC0 bit 1 to 7 contains Colorimetry Indicator Field. At
current implementation, at DP_TEST_DYNAMIC_RANGE_CEA case the
Colorimetry Indicator Field is mistakenly left shifted one extra
bit. This patch return correct value of colorimetry at
dp_link_get_colorimetry_config() to fix this problem.

Changes in V2:
-- drop retrieving colorimetry from colorspace
-- drop dr = link->dp_link.test_video.test_dyn_range assignment

Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
Signed-off-by: Kuogee Hsieh <quic_khsieh@...cinc.com>
---
 drivers/gpu/drm/msm/dp/dp_link.c | 11 ++++++-----
 drivers/gpu/drm/msm/dp/dp_link.h |  3 +++
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
index 98427d4..2e1bdaf 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.c
+++ b/drivers/gpu/drm/msm/dp/dp_link.c
@@ -1082,7 +1082,7 @@ int dp_link_process_request(struct dp_link *dp_link)
 
 int dp_link_get_colorimetry_config(struct dp_link *dp_link)
 {
-	u32 cc;
+	u32 cc = DP_MISC0_LEGACY_RGB;
 	struct dp_link_private *link;
 
 	if (!dp_link) {
@@ -1096,10 +1096,11 @@ int dp_link_get_colorimetry_config(struct dp_link *dp_link)
 	 * Unless a video pattern CTS test is ongoing, use RGB_VESA
 	 * Only RGB_VESA and RGB_CEA supported for now
 	 */
-	if (dp_link_is_video_pattern_requested(link))
-		cc = link->dp_link.test_video.test_dyn_range;
-	else
-		cc = DP_TEST_DYNAMIC_RANGE_VESA;
+	if (dp_link_is_video_pattern_requested(link)) {
+		if (link->dp_link.test_video.test_dyn_range &
+					DP_TEST_DYNAMIC_RANGE_CEA)
+			cc = DP_MISC0_CEA_RGB;
+	}
 
 	return cc;
 }
diff --git a/drivers/gpu/drm/msm/dp/dp_link.h b/drivers/gpu/drm/msm/dp/dp_link.h
index 9dd4dd9..fe8f716 100644
--- a/drivers/gpu/drm/msm/dp/dp_link.h
+++ b/drivers/gpu/drm/msm/dp/dp_link.h
@@ -12,6 +12,9 @@
 #define DP_TEST_BIT_DEPTH_UNKNOWN 0xFFFFFFFF
 #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)
 
+#define DP_MISC0_LEGACY_RGB		0
+#define DP_MISC0_CEA_RGB		0x04
+
 struct dp_link_info {
 	unsigned char revision;
 	unsigned int rate;
-- 
2.7.4