target/linux/layerscape/patches-5.4/805-display-0030-drm-imx-hdp-fix-issue-with-non-SCDC-HDMI-sinks.patch

   1 From d9440f7cb8fa5853b9dcc6e2b165725ac3e8b70c Mon Sep 17 00:00:00 2001
   2 From: Laurentiu Palcu <laurentiu.palcu@nxp.com>
   3 Date: Wed, 27 Nov 2019 13:34:51 +0200
   4 Subject: [PATCH] drm/imx/hdp: fix issue with non-SCDC HDMI sinks
   5
   6 Currently, if sink does not support SCDC, even if the sink is HDMI 1.4 or 2.0,
   7 the hdmi_type is left to default value (MODE_DVI). Hence the HDMI controler is
   8 not properly initialized when cdns_hdmi_ctrl_init() is called.
   9
  10 Signed-off-by: Laurentiu Palcu <laurentiu.palcu@nxp.com>
  11 Reported-by: Jared Hu <jared.hu@nxp.com>
  12 Reviewed-by: Sandor Yu <sandor.yu@nxp.com>
  13 ---
  14  drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c | 20 ++++++++++----------
  15  1 file changed, 10 insertions(+), 10 deletions(-)
  16
  17 --- a/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
  18 +++ b/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
  19 @@ -29,11 +29,17 @@
  20  static void hdmi_sink_config(struct cdns_mhdp_device *mhdp)
  21  {
  22         struct drm_scdc *scdc = &mhdp->connector.base.display_info.hdmi.scdc;
  23 -       u8 buff;
  24 +       struct drm_display_info *di = &mhdp->connector.base.display_info;
  25 +       u8 buff = 0;
  26 +
  27 +       if (scdc->supported || di->color_formats & DRM_COLOR_FORMAT_YCRCB420)
  28 +               mhdp->hdmi.hdmi_type = MODE_HDMI_2_0;
  29 +       else
  30 +               mhdp->hdmi.hdmi_type = MODE_HDMI_1_4;
  31
  32         /* check sink support SCDC or not */
  33 -       if (scdc->supported != true) {
  34 -               DRM_INFO("Sink Not Support SCDC\n");
  35 +       if (!scdc->supported) {
  36 +               DRM_INFO("Sink does not support SCDC\n");
  37                 return;
  38         }
  39
  40 @@ -43,19 +49,13 @@ static void hdmi_sink_config(struct cdns
  41                  * Enable scrambling and TMDS_Bit_Clock_Ratio
  42                  */
  43                 buff = SCDC_TMDS_BIT_CLOCK_RATIO_BY_40 | SCDC_SCRAMBLING_ENABLE;
  44 -               mhdp->hdmi.hdmi_type = MODE_HDMI_2_0;
  45         } else  if (scdc->scrambling.low_rates) {
  46                 /*
  47                  * Enable scrambling and HDMI2.0 when scrambling capability of sink
  48                  * be indicated in the HF-VSDB LTE_340Mcsc_scramble bit
  49                  */
  50                 buff = SCDC_SCRAMBLING_ENABLE;
  51 -               mhdp->hdmi.hdmi_type = MODE_HDMI_2_0;
  52 -       } else {
  53 -               /* Default work in HDMI1.4 */
  54 -               buff = 0;
  55 -               mhdp->hdmi.hdmi_type = MODE_HDMI_1_4;
  56 -        }
  57 +       }
  58
  59         /* TMDS config */
  60         cdns_hdmi_scdc_write(mhdp, 0x20, buff);