drm/tegra: hdmi - Disable LVDS mode

Disable LVDS mode according to register documentation. It seems like
this has no effect on the operation of HDMI, but it's probably a good
idea to do this anyway.

Signed-off-by: Thierry Reding <treding@nvidia.com>

2 files changed, 10 insertions, 1 deletions

diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 4116b08acabb..9cba9bf14079 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -846,9 +846,13 @@ static int tegra_output_hdmi_enable(struct tegra_output *output)
         tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_SEQ_INST(0));
         tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_SEQ_INST(8));
 
-        value = 0x1c800;
+        value = tegra_hdmi_readl(hdmi, HDMI_NV_PDISP_SOR_CSTM);
         value &= ~SOR_CSTM_ROTCLK(~0);
         value |= SOR_CSTM_ROTCLK(2);
+        value |= SOR_CSTM_PLLDIV;
+        value &= ~SOR_CSTM_LVDS_ENABLE;
+        value &= ~SOR_CSTM_MODE_MASK;
+        value |= SOR_CSTM_MODE_TMDS;
         tegra_hdmi_writel(hdmi, value, HDMI_NV_PDISP_SOR_CSTM);
 
         /* start SOR */
diff --git a/drivers/gpu/drm/tegra/hdmi.h b/drivers/gpu/drm/tegra/hdmi.h
index 0aebc485f7fa..919a19df4e1b 100644
--- a/drivers/gpu/drm/tegra/hdmi.h
+++ b/drivers/gpu/drm/tegra/hdmi.h
@@ -190,6 +190,11 @@
 
 #define HDMI_NV_PDISP_SOR_CSTM                                  0x5a
 #define SOR_CSTM_ROTCLK(x) (((x) & 0xf) << 24)
+#define SOR_CSTM_PLLDIV (1 << 21)
+#define SOR_CSTM_LVDS_ENABLE (1 << 16)
+#define SOR_CSTM_MODE_LVDS (0 << 12)
+#define SOR_CSTM_MODE_TMDS (1 << 12)
+#define SOR_CSTM_MODE_MASK (3 << 12)
 
 #define HDMI_NV_PDISP_SOR_LVDS                                  0x5b
 #define HDMI_NV_PDISP_SOR_CRCA                                  0x5c