gma500: SDVO DDC bus guessing isn't working so hardcode it instead

We currently don't have support for parsing SDVO mappings from BIOS so we're
guessing the bus switch parameter. This isn't working so hardcode it to a
configuration known to work on most poulsbo hardware.

Signed-off-by: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/gma500/psb_intel_sdvo.c

@@ -1876,6 +1876,13 @@ static const struct drm_encoder_funcs psb_intel_sdvo_enc_funcs = {
 static void
 psb_intel_sdvo_guess_ddc_bus(struct psb_intel_sdvo *sdvo)
 {
+	/* FIXME: At the moment, ddc_bus = 2 is the only thing that works.
+	 * We need to figure out if this is true for all available poulsbo
+	 * hardware, or if we need to fiddle with the guessing code above.
+	 * The problem might go away if we can parse sdvo mappings from bios */
+	sdvo->ddc_bus = 2;
+
+#if 0
 	uint16_t mask = 0;
 	unsigned int num_bits;
 
@@ -1907,6 +1914,7 @@ psb_intel_sdvo_guess_ddc_bus(struct psb_intel_sdvo *sdvo)
 
 	/* Corresponds to SDVO_CONTROL_BUS_DDCx */
 	sdvo->ddc_bus = 1 << num_bits;
+#endif
 }
 
 /**