drm/i915: correctly set the DDI_FUNC_CTL bpc field

Correctly erase the values previously set and also check for 6bpc and
10bpc.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 896b279..f3fafb8 100644 (file)
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4308,6 +4308,7 @@
 #define  PIPE_DDI_MODE_SELECT_DP_SST   (2<<24)
 #define  PIPE_DDI_MODE_SELECT_DP_MST   (3<<24)
 #define  PIPE_DDI_MODE_SELECT_FDI              (4<<24)
+#define  PIPE_DDI_BPC_MASK                     (7<<20)
 #define  PIPE_DDI_BPC_8                                        (0<<20)
 #define  PIPE_DDI_BPC_10                               (1<<20)
 #define  PIPE_DDI_BPC_6                                        (2<<20)

diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 1fbd67c..8b38359 100644 (file)
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -725,14 +725,28 @@ void intel_ddi_mode_set(struct drm_encoder *encoder,
        /* Enable PIPE_DDI_FUNC_CTL for the pipe to work in HDMI mode */
        temp = I915_READ(DDI_FUNC_CTL(pipe));
        temp &= ~PIPE_DDI_PORT_MASK;
-       temp &= ~PIPE_DDI_BPC_12;
+       temp &= ~PIPE_DDI_BPC_MASK;
        temp &= ~PIPE_DDI_MODE_SELECT_MASK;
        temp &= ~(PIPE_DDI_PVSYNC | PIPE_DDI_PHSYNC);
-       temp |= PIPE_DDI_SELECT_PORT(port) |
-                       ((intel_crtc->bpp > 24) ?
-                               PIPE_DDI_BPC_12 :
-                               PIPE_DDI_BPC_8) |
-                       PIPE_DDI_FUNC_ENABLE;
+       temp |= PIPE_DDI_FUNC_ENABLE | PIPE_DDI_SELECT_PORT(port);
+
+       switch (intel_crtc->bpp) {
+       case 18:
+               temp |= PIPE_DDI_BPC_6;
+               break;
+       case 24:
+               temp |= PIPE_DDI_BPC_8;
+               break;
+       case 30:
+               temp |= PIPE_DDI_BPC_10;
+               break;
+       case 36:
+               temp |= PIPE_DDI_BPC_12;
+               break;
+       default:
+               WARN(1, "%d bpp unsupported by pipe DDI function\n",
+                    intel_crtc->bpp);
+       }
 
        if (intel_hdmi->has_hdmi_sink)
                temp |= PIPE_DDI_MODE_SELECT_HDMI;