[PATCH 2/8] drm/i915: Gen2 FBC1 CFB pitch wants 32B units

ville.syrjala
2013-11-28T15:30:15Z

From: Ville Syrjälä <ville.syrjala@linux.intel.com>

On gen2 the compressed frame buffer pitch is specified in 32B units
rather than the 64B units used on gen3+.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 614549b..1dee34c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -103,8 +103,11 @@ static void i8xx_enable_fbc(struct drm_crtc *crtc,
if (fb->pitches[0] < cfb_pitch)
cfb_pitch = fb->pitches[0];

- /* FBC_CTL wants 64B units */
- cfb_pitch = (cfb_pitch / 64) - 1;
+ /* FBC_CTL wants 32B or 64B units */
+ if (IS_GEN2(dev))
+ cfb_pitch = (cfb_pitch / 32) - 1;
+ else
+ cfb_pitch = (cfb_pitch / 64) - 1;
plane = intel_crtc->plane == 0 ? FBC_CTL_PLANEA : FBC_CTL_PLANEB;

/* Clear old tags */
--
1.8.3.2

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