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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-04-13 21:19:49 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2016-04-14 14:45:15 +0300 |
| commit | 7ce4d1f2730f2bd4320425dd376913c4a12bd3b2 (patch) | |
| tree | ec3f0b65a08485007711f27f079d2b537d95171b /drivers/gpu/drm/i915/i915_irq.c | |
| parent | 34c7b8a7b8b5a2075b37654aa2d1a46b1cee9ef2 (diff) | |
| download | blackbird-op-linux-7ce4d1f2730f2bd4320425dd376913c4a12bd3b2.tar.gz blackbird-op-linux-7ce4d1f2730f2bd4320425dd376913c4a12bd3b2.zip | |
drm/i915: Clear VLV_IIR after PIPESTAT
On VLV/CHV VLV_IIR is not double double buffered, and it doesn't detect
edges from PIPESTAT & co. like it does on gen4. Instead it just
directly latches the level from PIPESTAT & co. That means we must clear
VLV_IIR after PIPESTAT & co. or else we'll get a spurious bit in VLV_IIR
every single time.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460571598-24452-4-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_irq.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_irq.c | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index b4152f1d9ed8..d0c64ed657b9 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1789,12 +1789,6 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg) I915_WRITE(GEN6_PMIIR, pm_iir); iir = I915_READ(VLV_IIR); - if (iir) { - /* Consume port before clearing IIR or we'll miss events */ - if (iir & I915_DISPLAY_PORT_INTERRUPT) - i9xx_hpd_irq_handler(dev); - I915_WRITE(VLV_IIR, iir); - } if (gt_iir == 0 && pm_iir == 0 && iir == 0) goto out; @@ -1805,9 +1799,20 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg) snb_gt_irq_handler(dev, dev_priv, gt_iir); if (pm_iir) gen6_rps_irq_handler(dev_priv, pm_iir); + + if (iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + /* Call regardless, as some status bits might not be * signalled in iir */ valleyview_pipestat_irq_handler(dev, iir); + + /* + * VLV_IIR is single buffered, and reflects the level + * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last. + */ + if (iir) + I915_WRITE(VLV_IIR, iir); } out: @@ -1840,21 +1845,22 @@ static irqreturn_t cherryview_irq_handler(int irq, void *arg) I915_WRITE(GEN8_MASTER_IRQ, 0); - /* Find, clear, then process each source of interrupt */ - - if (iir) { - /* Consume port before clearing IIR or we'll miss events */ - if (iir & I915_DISPLAY_PORT_INTERRUPT) - i9xx_hpd_irq_handler(dev); - I915_WRITE(VLV_IIR, iir); - } - gen8_gt_irq_handler(dev_priv, master_ctl); + if (iir & I915_DISPLAY_PORT_INTERRUPT) + i9xx_hpd_irq_handler(dev); + /* Call regardless, as some status bits might not be * signalled in iir */ valleyview_pipestat_irq_handler(dev, iir); + /* + * VLV_IIR is single buffered, and reflects the level + * from PIPESTAT/PORT_HOTPLUG_STAT, hence clear it last. + */ + if (iir) + I915_WRITE(VLV_IIR, iir); + I915_WRITE(GEN8_MASTER_IRQ, GEN8_MASTER_IRQ_CONTROL); POSTING_READ(GEN8_MASTER_IRQ); } while (0); |
