drivers: video: tegra: fix AVI RGB quantization

The HDMI 2.0 Specification (section 7.3) recommends that the AVI Q
field is always set to either Limited or Full regardless of the EDID QS
bit.

Remove the default value (Q=0) as well as the checking for QS bit.

Bug 2805930

Change-Id: Id757e546583336c8dd48aca169a5e1feca864563
Signed-off-by: Ahung Cheng <ahcheng@nvidia.com>
(cherry picked from commit f64c72c28c31f671199feb429e7770c177b48058)
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2318701
Reviewed-by: automaticguardword <automaticguardword@nvidia.com>
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Prafull Suryawanshi <prafulls@nvidia.com>
Reviewed-by: Naveen Kumar S <nkumars@nvidia.com>
Reviewed-by: Bibek Basu <bbasu@nvidia.com>
Reviewed-by: Ujwal Patel <ujwalp@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit

1 files changed, 3 insertions, 10 deletions

diff --git a/drivers/video/tegra/dc/hdmi2.0.c b/drivers/video/tegra/dc/hdmi2.0.c
index 5863e5996..dc7be64c0 100644
--- a/drivers/video/tegra/dc/hdmi2.0.c
+++ b/drivers/video/tegra/dc/hdmi2.0.c
@@ -1,7 +1,7 @@
 /*
  * hdmi2.0.c: hdmi2.0 driver.
  *
- * Copyright (c) 2014-2019, NVIDIA CORPORATION, All rights reserved.
+ * Copyright (c) 2014-2020, NVIDIA CORPORATION, All rights reserved.
  * Author: Animesh Kishore <ankishore@nvidia.com>
  *
  * This software is licensed under the terms of the GNU General Public
@@ -2070,7 +2070,6 @@ static u32 tegra_hdmi_get_ex_colorimetry(struct tegra_hdmi *hdmi)
 static u32 tegra_hdmi_get_rgb_quant(struct tegra_hdmi *hdmi)
 {
         u32 vmode = hdmi->dc->mode.vmode;
-        u32 hdmi_quant = HDMI_AVI_RGB_QUANT_DEFAULT;
 
         /*
          * For seamless HDMI, read Q0/Q1 from bootloader
@@ -2095,14 +2094,8 @@ static u32 tegra_hdmi_get_rgb_quant(struct tegra_hdmi *hdmi)
                 }
         }
 
-        dev_info(&hdmi->dc->ndev->dev, "hdmi: get RGB quant from EDID.\n");
-        if (tegra_edid_is_rgb_quantization_selectable(hdmi->edid)) {
-                if (vmode & FB_VMODE_LIMITED_RANGE)
-                        hdmi_quant = HDMI_AVI_RGB_QUANT_LIMITED;
-                else
-                        hdmi_quant = HDMI_AVI_RGB_QUANT_FULL;
-        }
-        return hdmi_quant;
+        return (vmode & FB_VMODE_LIMITED_RANGE) ? HDMI_AVI_RGB_QUANT_LIMITED :
+                HDMI_AVI_RGB_QUANT_FULL;
 }
 
 static u32 tegra_hdmi_get_ycc_quant(struct tegra_hdmi *hdmi)