From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Gen2 doesn't have a hardware frame counter that can be read out. Just
provide a stub .get_vblank_counter() that always returns 0 instead of
trying to read non-existing registers.
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_irq.c | 11 ++++++++++-
1 file changed, 10 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 3c31a2f..73781a0 100644
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -518,6 +518,12 @@ i915_pipe_enabled(struct drm_device *dev, int pipe)
}
}
+static u32 i8xx_get_vblank_counter(struct drm_device *dev, int pipe)
+{
+ /* Gen2 doesn't have a hardware frame counter */
+ return 0;
+}
+
/* Called from drm generic code, passed a 'crtc', which
* we use as a pipe index
*/
@@ -3231,7 +3237,10 @@ void intel_irq_init(struct drm_device *dev)
pm_qos_add_request(&dev_priv->pm_qos, PM_QOS_CPU_DMA_LATENCY, PM_QOS_DEFAULT_VALUE);
- if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
+ if (IS_GEN2(dev)) {
+ dev->max_vblank_count = 0;
+ dev->driver->get_vblank_counter = i8xx_get_vblank_counter;
+ } else if (IS_G4X(dev) || INTEL_INFO(dev)->gen >= 5) {
dev->max_vblank_count = 0xffffffff; /* full 32 bit counter */
dev->driver->get_vblank_counter = gm45_get_vblank_counter;
} else {
--
1.8.1.5
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