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drm/i915/overlay: Workaround i830 overlay activation bug.

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On i830, there exists a bug where an overlay on pipe B requires the mode
clock on pipe A in order to activate. So workaround this by activating
pipe A when trying to enable the overlay on pipe B.

References:

  [Bug 29007] GPU hang on video playback with overlay
  https://bugs.freedesktop.org/show_bug.cgi?id=29007

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-07-16 17:13:01 +01:00
parent 5fe82c5ee1
commit 106dadacbe
1 changed files with 67 additions and 4 deletions
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71
drivers/gpu/drm/i915/intel_overlay.c
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@ -243,18 +243,76 @@ static int intel_overlay_do_wait_request(struct intel_overlay *overlay,
return 0;
}
/* Workaround for i830 bug where pipe a must be enable to change control regs */
static int
i830_activate_pipe_a(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct intel_crtc *crtc;
struct drm_crtc_helper_funcs *crtc_funcs;
struct drm_display_mode vesa_640x480 = {
DRM_MODE("640x480", DRM_MODE_TYPE_DRIVER, 25175, 640, 656,
752, 800, 0, 480, 489, 492, 525, 0,
DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC)
}, *mode;
crtc = to_intel_crtc(dev_priv->pipe_to_crtc_mapping[0]);
if (crtc->dpms_mode == DRM_MODE_DPMS_ON)
return 0;
/* most i8xx have pipe a forced on, so don't trust dpms mode */
if (I915_READ(PIPEACONF) & PIPEACONF_ENABLE)
return 0;
crtc_funcs = crtc->base.helper_private;
if (crtc_funcs->dpms == NULL)
return 0;
DRM_DEBUG_DRIVER("Enabling pipe A in order to enable overlay\n");
mode = drm_mode_duplicate(dev, &vesa_640x480);
drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
if(!drm_crtc_helper_set_mode(&crtc->base, mode,
crtc->base.x, crtc->base.y,
crtc->base.fb))
return 0;
crtc_funcs->dpms(&crtc->base, DRM_MODE_DPMS_ON);
return 1;
}
static void
i830_deactivate_pipe_a(struct drm_device *dev)
{
drm_i915_private_t *dev_priv = dev->dev_private;
struct drm_crtc *crtc = dev_priv->pipe_to_crtc_mapping[0];
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
crtc_funcs->dpms(crtc, DRM_MODE_DPMS_OFF);
}
/* overlay needs to be disable in OCMD reg */
static int intel_overlay_on(struct intel_overlay *overlay)
{
struct drm_device *dev = overlay->dev;
struct drm_i915_gem_request *request;
int pipe_a_quirk = 0;
int ret;
BUG_ON(overlay->active);
overlay->active = 1;
if (IS_I830(dev)) {
pipe_a_quirk = i830_activate_pipe_a(dev);
if (pipe_a_quirk < 0)
return pipe_a_quirk;
}
request = kzalloc(sizeof(*request), GFP_KERNEL);
if (request == NULL)
return -ENOMEM;
if (request == NULL) {
ret = -ENOMEM;
goto out;
}
BEGIN_LP_RING(4);
OUT_RING(MI_OVERLAY_FLIP | MI_OVERLAY_ON);
@ -263,8 +321,13 @@ static int intel_overlay_on(struct intel_overlay *overlay)
OUT_RING(MI_NOOP);
ADVANCE_LP_RING();
return intel_overlay_do_wait_request(overlay, request, true,
NEEDS_WAIT_FOR_FLIP);
ret = intel_overlay_do_wait_request(overlay, request, true,
NEEDS_WAIT_FOR_FLIP);
out:
if (pipe_a_quirk)
i830_deactivate_pipe_a(dev);
return ret;
}
/* overlay needs to be enabled in OCMD reg */