[Intel-gfx] [PATCH 1/8] drm/i915: fix pipe DDI mode select

[Paulo Zanoni]

From: Paulo Zanoni <paulo.r.zanoni at intel.com>

Mask the value before changing it and also select DVI when needed.

DVI was working in cases where the BIOS was setting the correct value
because we were not masking the value before changing it.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h  | 1 +
 drivers/gpu/drm/i915/intel_ddi.c | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 1310caa..97f00fb 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -4302,6 +4302,7 @@
 /* Those bits are ignored by pipe EDP since it can only connect to DDI A */
 #define  PIPE_DDI_PORT_MASK			(7<<28)
 #define  PIPE_DDI_SELECT_PORT(x)		((x)<<28)
+#define  PIPE_DDI_MODE_SELECT_MASK		(7<<24)
 #define  PIPE_DDI_MODE_SELECT_HDMI		(0<<24)
 #define  PIPE_DDI_MODE_SELECT_DVI		(1<<24)
 #define  PIPE_DDI_MODE_SELECT_DP_SST	(2<<24)
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 32604ac..0d7acd7 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -726,13 +726,18 @@ void intel_ddi_mode_set(struct drm_encoder *encoder,
 	temp = I915_READ(DDI_FUNC_CTL(pipe));
 	temp &= ~PIPE_DDI_PORT_MASK;
 	temp &= ~PIPE_DDI_BPC_12;
+	temp &= ~PIPE_DDI_MODE_SELECT_MASK;
 	temp |= PIPE_DDI_SELECT_PORT(port) |
-			PIPE_DDI_MODE_SELECT_HDMI |
 			((intel_crtc->bpp > 24) ?
 				PIPE_DDI_BPC_12 :
 				PIPE_DDI_BPC_8) |
 			PIPE_DDI_FUNC_ENABLE;
 
+	if (intel_hdmi->has_hdmi_sink)
+		temp |= PIPE_DDI_MODE_SELECT_HDMI;
+	else
+		temp |= PIPE_DDI_MODE_SELECT_DVI;
+
 	I915_WRITE(DDI_FUNC_CTL(pipe), temp);
 
 	intel_hdmi->set_infoframes(encoder, adjusted_mode);
-- 
1.7.11.2