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

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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>
This commit is contained in:
Patrik Jakobsson 2011-12-19 21:41:45 +00:00 • committed by Dave Airlie
parent 9bd81acdb6
commit fea578b6a1
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/gma500/psb_intel_sdvo.c
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@ -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
}
/**