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drm/amd/display: Enforce 60us prefetch for 200Mhz DCFCLK modes

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commit b504f99cca upstream.

[Description]
- Due to bandwidth / arbitration issues at 200Mhz DCFCLK,
  we want to enforce minimum 60us of prefetch to avoid
  intermittent underflow issues
- Since 60us prefetch is already enforced for UCLK DPM0,
  and many DCFCLK's > 200Mhz are mapped to UCLK DPM1, in
  theory there should not be any UCLK DPM regressions by
  enforcing greater prefetch

Reviewed-by: Nevenko Stupar <Nevenko.Stupar@amd.com>
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Cc: Mario Limonciello <mario.limonciello@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alvin Lee
2023-04-27 15:10:13 -04:00
committed by Greg Kroah-Hartman
parent 7a8248317b
commit 348dcdf102
2 changed files with 4 additions and 2 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.c
View File

@@ -807,7 +807,8 @@ static void DISPCLKDPPCLKDCFCLKDeepSleepPrefetchParametersWatermarksAndPerforman
v->SwathHeightY[k], v->SwathHeightY[k],
v->SwathHeightC[k], v->SwathHeightC[k],
TWait, TWait,
v->DRAMSpeedPerState[mode_lib->vba.VoltageLevel] <= MEM_STROBE_FREQ_MHZ ? (v->DRAMSpeedPerState[mode_lib->vba.VoltageLevel] <= MEM_STROBE_FREQ_MHZ ||
v->DCFCLKPerState[mode_lib->vba.VoltageLevel] <= MIN_DCFCLK_FREQ_MHZ) ?
mode_lib->vba.ip.min_prefetch_in_strobe_us : 0, mode_lib->vba.ip.min_prefetch_in_strobe_us : 0,
/* Output */ /* Output */
&v->DSTXAfterScaler[k], &v->DSTXAfterScaler[k],
@@ -3288,7 +3289,7 @@ void dml32_ModeSupportAndSystemConfigurationFull(struct display_mode_lib *mode_l
v->swath_width_chroma_ub_this_state[k], v->swath_width_chroma_ub_this_state[k],
v->SwathHeightYThisState[k], v->SwathHeightYThisState[k],
v->SwathHeightCThisState[k], v->TWait, v->SwathHeightCThisState[k], v->TWait,
v->DRAMSpeedPerState[i] <= MEM_STROBE_FREQ_MHZ ? (v->DRAMSpeedPerState[i] <= MEM_STROBE_FREQ_MHZ || v->DCFCLKState[i][j] <= MIN_DCFCLK_FREQ_MHZ) ?
mode_lib->vba.ip.min_prefetch_in_strobe_us : 0, mode_lib->vba.ip.min_prefetch_in_strobe_us : 0,
/* Output */ /* Output */

1
drivers/gpu/drm/amd/display/dc/dml/dcn32/display_mode_vba_32.h
View File

@@ -52,6 +52,7 @@
#define BPP_BLENDED_PIPE 0xffffffff #define BPP_BLENDED_PIPE 0xffffffff
#define MEM_STROBE_FREQ_MHZ 1600 #define MEM_STROBE_FREQ_MHZ 1600
#define MIN_DCFCLK_FREQ_MHZ 200
#define MEM_STROBE_MAX_DELIVERY_TIME_US 60.0 #define MEM_STROBE_MAX_DELIVERY_TIME_US 60.0
struct display_mode_lib; struct display_mode_lib;