[Intel-gfx] [PATCH 09/11] drm/i915/glk: IPC linetime watermark workaround for GLK
Mahesh Kumar
mahesh1.kumar at intel.com
Wed Jul 5 14:31:52 UTC 2017
From: "Kumar, Mahesh" <mahesh1.kumar at intel.com>
IF IPC is enabled LINETIME_WM value should be half of calculated value
line time = ROUNDDOWN(1/2 * Calculated Line Time)
Earlier code was rounding-up the value, But updated Bspec says we should
take the ROUNDDOWN. This patch corrects that as well.
Signed-off-by: Mahesh Kumar <mahesh1.kumar at intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 9a6540adcb0d..231a7463868c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4571,9 +4571,10 @@ skl_compute_linetime_wm(struct intel_crtc_state *cstate)
linetime_wm = fixed16_to_u32_round_up(mul_u32_fixed16(8, linetime_us));
- /* Display WA #1135: bxt. */
- if (IS_BROXTON(dev_priv) && dev_priv->ipc_enabled)
- linetime_wm = DIV_ROUND_UP(linetime_wm, 2);
+ /* Display WA #1135: bxt:ALL GLK:ALL */
+ if ((IS_BROXTON(dev_priv) || IS_GEMINILAKE(dev_priv)) &&
+ dev_priv->ipc_enabled)
+ linetime_wm /= 2;
return linetime_wm;
}
--
2.13.0
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