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authorJesse Barnes <jbarnes@virtuousgeek.org>2009-07-16 13:01:02 -0700
committerEric Anholt <eric@anholt.net>2009-07-16 13:02:40 -0700
commit2a2430f4542467502d39660bfd66b0004fd8d6a9 (patch)
tree8ff5a492835af7460bc0dd713e7b84b6dacdcd86 /drivers/gpu
parent390c4dd448b1a5f04ea497c20f5ff664f8eeed01 (diff)
drm/i915: correct self-refresh calculation in "everything off" case
If no planes are enabled, the self-refresh calculation may end up doing a divide by zero. This patch should prevent that by making sure at least one of the CRTCs had a valid hdisplay value. Reported-by: Eric Anholt <eric@anholt.net> Tested-by: Eric Anholt <eric@anholt.net> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> Signed-off-by: Eric Anholt <eric@anholt.net>
Diffstat (limited to 'drivers/gpu')
-rw-r--r--drivers/gpu/drm/i915/intel_display.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 890f7108e72..a58bfadabd6 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -1906,7 +1906,7 @@ static void i9xx_update_wm(struct drm_device *dev, int planea_clock,
cwm = 2;
/* Calc sr entries for one plane configs */
- if (!planea_clock || !planeb_clock) {
+ if (sr_hdisplay && (!planea_clock || !planeb_clock)) {
/* self-refresh has much higher latency */
const static int sr_latency_ns = 6000;
@@ -1921,6 +1921,8 @@ static void i9xx_update_wm(struct drm_device *dev, int planea_clock,
srwm = total_size - sr_entries;
if (srwm < 0)
srwm = 1;
+ if (IS_I9XX(dev))
+ I915_WRITE(FW_BLC_SELF, (srwm & 0x3f));
}
DRM_DEBUG("Setting FIFO watermarks - A: %d, B: %d, C: %d, SR %d\n",
@@ -1935,8 +1937,6 @@ static void i9xx_update_wm(struct drm_device *dev, int planea_clock,
I915_WRITE(FW_BLC, fwater_lo);
I915_WRITE(FW_BLC2, fwater_hi);
- if (IS_I9XX(dev))
- I915_WRITE(FW_BLC_SELF, (srwm & 0x3f));
}
static void i830_update_wm(struct drm_device *dev, int planea_clock,