[PATCH 1/8] drm/i915/sdvo: Filter out invalid outputs more sensibly

[Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>]

From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

We try to filter out the corresponding xxx1 output
if the xxx0 output is not present. But the way that is
being done is pretty awkward. Make it less so.

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
 drivers/gpu/drm/i915/display/intel_sdvo.c | 29 ++++++++++++++++++-----
 1 file changed, 23 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_sdvo.c b/drivers/gpu/drm/i915/display/intel_sdvo.c
index cf8e80936d8e..c6200a91a777 100644
--- a/drivers/gpu/drm/i915/display/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/display/intel_sdvo.c
@@ -2925,16 +2925,33 @@ intel_sdvo_lvds_init(struct intel_sdvo *intel_sdvo, int device)
 	return false;
 }
 
-static bool
-intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
+static u16 intel_sdvo_filter_output_flags(u16 flags)
 {
+	flags &= SDVO_OUTPUT_MASK;
+
 	/* SDVO requires XXX1 function may not exist unless it has XXX0 function.*/
+	if (!(flags & SDVO_OUTPUT_TMDS0))
+		flags &= ~SDVO_OUTPUT_TMDS1;
+
+	if (!(flags & SDVO_OUTPUT_RGB0))
+		flags &= ~SDVO_OUTPUT_RGB1;
+
+	if (!(flags & SDVO_OUTPUT_LVDS0))
+		flags &= ~SDVO_OUTPUT_LVDS1;
+
+	return flags;
+}
+
+static bool
+intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
+{
+	flags = intel_sdvo_filter_output_flags(flags);
 
 	if (flags & SDVO_OUTPUT_TMDS0)
 		if (!intel_sdvo_dvi_init(intel_sdvo, 0))
 			return false;
 
-	if ((flags & SDVO_TMDS_MASK) == SDVO_TMDS_MASK)
+	if (flags & SDVO_OUTPUT_TMDS1)
 		if (!intel_sdvo_dvi_init(intel_sdvo, 1))
 			return false;
 
@@ -2955,7 +2972,7 @@ intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
 		if (!intel_sdvo_analog_init(intel_sdvo, 0))
 			return false;
 
-	if ((flags & SDVO_RGB_MASK) == SDVO_RGB_MASK)
+	if (flags & SDVO_OUTPUT_RGB1)
 		if (!intel_sdvo_analog_init(intel_sdvo, 1))
 			return false;
 
@@ -2963,11 +2980,11 @@ intel_sdvo_output_setup(struct intel_sdvo *intel_sdvo, u16 flags)
 		if (!intel_sdvo_lvds_init(intel_sdvo, 0))
 			return false;
 
-	if ((flags & SDVO_LVDS_MASK) == SDVO_LVDS_MASK)
+	if (flags & SDVO_OUTPUT_LVDS1)
 		if (!intel_sdvo_lvds_init(intel_sdvo, 1))
 			return false;
 
-	if ((flags & SDVO_OUTPUT_MASK) == 0) {
+	if (flags == 0) {
 		unsigned char bytes[2];
 
 		intel_sdvo->controlled_output = 0;
-- 
2.37.4