mirrors/linux
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git synced 2026-05-05 07:30:06 -04:00
Code Issues Packages Projects Releases Wiki Activity

drm/i915/alpm: Calculate ALPM Entry check

Browse Source 
ALPM Entry Check represents the number of lines needed to put the main link
to sleep and keep it in the sleep state before it can be taken out of the
SLEEP state (eDP requires the main link to be in the SLEEP state for a
minimum of 5us).

Bspec: 71477

v2: move display version check into _lnl_compute_alpm_param

Signed-off-by: Jouni Högander <jouni.hogander@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240130111130.3298779-4-jouni.hogander@intel.com
This commit is contained in:
Jouni Högander
2024-01-30 13:11:29 +02:00
parent 96a2494573
commit 29f3067a23
2 changed files with 32 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/gpu/drm/i915/display/intel_display_types.h
View File

@@ -1716,6 +1716,9 @@ struct intel_psr {
struct {
u8 io_wake_lines;
u8 fast_wake_lines;
/* LNL and beyond */
u8 check_entry_lines;
} alpm_parameters;
ktime_t last_entry_attempt;

29
drivers/gpu/drm/i915/display/intel_psr.c
View File

@@ -1126,6 +1126,30 @@ static bool _compute_psr2_sdp_prior_scanline_indication(struct intel_dp *intel_d
return true;
}
static bool _lnl_compute_alpm_params(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
{
struct drm_i915_private *i915 = dp_to_i915(intel_dp);
int check_entry_lines;
if (DISPLAY_VER(i915) < 20)
return true;
/* ALPM Entry Check = 2 + CEILING( 5us /tline ) */
check_entry_lines = 2 +
intel_usecs_to_scanlines(&crtc_state->hw.adjusted_mode, 5);
if (check_entry_lines > 15)
return false;
if (i915->display.params.psr_safest_params)
check_entry_lines = 15;
intel_dp->psr.alpm_parameters.check_entry_lines = check_entry_lines;
return true;
}
static bool _compute_alpm_params(struct intel_dp *intel_dp,
struct intel_crtc_state *crtc_state)
{
@@ -1140,6 +1164,8 @@ static bool _compute_alpm_params(struct intel_dp *intel_dp,
* it is not enough -> use 45 us.
*/
fast_wake_time = 45;
/* TODO: Check how we can use ALPM_CTL fast wake extended field */
max_wake_lines = 12;
} else {
io_wake_time = 50;
@@ -1156,6 +1182,9 @@ static bool _compute_alpm_params(struct intel_dp *intel_dp,
fast_wake_lines > max_wake_lines)
return false;
if (!_lnl_compute_alpm_params(intel_dp, crtc_state))
return false;
if (i915->display.params.psr_safest_params)
io_wake_lines = fast_wake_lines = max_wake_lines;