On 12/19/2015 05:28 AM, Radhakrishna Sripada wrote:
Original value of 32 blocks is not sufficient when using cursor size of
256x256 causing FIFO underruns when the reworked wm
caluclations in
commit 024c9045221fe45482863c47c4b4c47d37f97cbf
Author: Matt Roper <matthew.d.roper@xxxxxxxxx>
Date: Thu Sep 24 15:53:11 2015 -0700
drm/i915/skl: Eliminate usage of pipe_wm_parameters from SKL-style WM (v4)
are used. Increasing the number of blocks to 52 to make cursor plane tolerate
SAGV block time for the maximum possible cursor size.
v2: Included Matt's suggestion, bumping up the no of blocks in multi-pipe case
to 16.
This does fix the blanking/unblanking in case of external 4k@60 DP
monitor. Will do some test on the patch suggested by Matt in the other mail.
Regards
Shobhit
Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada@xxxxxxxxx>
Signed-off-by: Kalyan Kondapally <kalyan.kondapally@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_pm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index d385d99..c5ba4e5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2802,9 +2802,9 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
static unsigned int skl_cursor_allocation(const struct intel_wm_config *config)
{
if (config->num_pipes_active == 1)
- return 32;
+ return 52;
- return 8;
+ return 16;
}
static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry, u32 reg)
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