github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-26 16:12:59 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

drm/i915/psr: Do not read PSR2_SU_STATUS on AlderLake and onwards

Browse Source 
Bspec comment on PSR2_SU_STATUS:

"This register has been tied-off since DG2/ADL-P (it returns zeros only)
and it has been removed on Xe2_LPD."

v2: fix inversed logic

Bspec: 69889
Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Mika Kahola <mika.kahola@intel.com>
Link: https://lore.kernel.org/r/20250516063019.2126702-1-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander 2025-05-16 09:30:19 +03:00
parent 1c57014325
commit 5666e27a50
1 changed files with 20 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/gpu/drm/i915/display/intel_psr.c
View File

@ -4021,24 +4021,30 @@ static int intel_psr_status(struct seq_file *m, struct intel_dp *intel_dp)
int frame;
/*
* Reading all 3 registers before hand to minimize crossing a
* frame boundary between register reads
* PSR2_SU_STATUS register has been tied-off since DG2/ADL-P
* (it returns zeros only) and it has been removed on Xe2_LPD.
*/
for (frame = 0; frame < PSR2_SU_STATUS_FRAMES; frame += 3) {
val = intel_de_read(display,
PSR2_SU_STATUS(display, cpu_transcoder, frame));
su_frames_val[frame / 3] = val;
}
if (DISPLAY_VER(display) < 13) {
/*
* Reading all 3 registers before hand to minimize crossing a
* frame boundary between register reads
*/
for (frame = 0; frame < PSR2_SU_STATUS_FRAMES; frame += 3) {
val = intel_de_read(display,
PSR2_SU_STATUS(display, cpu_transcoder, frame));
su_frames_val[frame / 3] = val;
}
seq_puts(m, "Frame:\tPSR2 SU blocks:\n");
seq_puts(m, "Frame:\tPSR2 SU blocks:\n");
for (frame = 0; frame < PSR2_SU_STATUS_FRAMES; frame++) {
u32 su_blocks;
for (frame = 0; frame < PSR2_SU_STATUS_FRAMES; frame++) {
u32 su_blocks;
su_blocks = su_frames_val[frame / 3] &
PSR2_SU_STATUS_MASK(frame);
su_blocks = su_blocks >> PSR2_SU_STATUS_SHIFT(frame);
seq_printf(m, "%d\t%d\n", frame, su_blocks);
su_blocks = su_frames_val[frame / 3] &
PSR2_SU_STATUS_MASK(frame);
su_blocks = su_blocks >> PSR2_SU_STATUS_SHIFT(frame);
seq_printf(m, "%d\t%d\n", frame, su_blocks);
}
}
seq_printf(m, "PSR2 selective fetch: %s\n",