We round-trip quite often from sdvo dtd timings through drm mode back
to sdvo dtd timings, e.g. due to mode_fixup. Add an informational
message that tells us when we lose things on the way.
Signed-Off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
---
drivers/gpu/drm/i915/intel_sdvo.c | 5 +++++
1 files changed, 5 insertions(+), 0 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c
index a6de3a6..2c14e37 100644
--- a/drivers/gpu/drm/i915/intel_sdvo.c
+++ b/drivers/gpu/drm/i915/intel_sdvo.c
@@ -804,6 +804,11 @@ static void intel_sdvo_get_mode_from_dtd(struct drm_display_mode * mode,
mode->clock = dtd->part1.clock * 10;
+ if (dtd->part2.dtd_flags & ~(0x2 | 0x4) || dtd->part2.sdvo_flags)
+ DRM_INFO("Potentially losing SDVO DTD parameters, "
+ "dtd_flags: 0x%02x, sdvo_flags: 0x%02x\n",
+ dtd->part2.dtd_flags, dtd->part2.sdvo_flags);
+
mode->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
if (dtd->part2.dtd_flags & 0x2)
mode->flags |= DRM_MODE_FLAG_PHSYNC;
--
1.7.9.1
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