diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c index 5d499b99aba9..c7715a17f388 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c @@ -2995,6 +2995,53 @@ static int allow_edp_hotplug_detection_set(void *data, u64 val) return 0; } +/* check if kernel disallow eDP enter psr state + * cat /sys/kernel/debug/dri/0/eDP-X/disallow_edp_enter_psr + * 0: allow edp enter psr; 1: disallow + */ +static int disallow_edp_enter_psr_get(void *data, u64 *val) +{ + struct amdgpu_dm_connector *aconnector = data; + + *val = (u64) aconnector->disallow_edp_enter_psr; + return 0; +} + +/* set kernel disallow eDP enter psr state + * echo 0x0 /sys/kernel/debug/dri/0/eDP-X/disallow_edp_enter_psr + * 0: allow edp enter psr; 1: disallow + * + * usage: test app read crc from PSR eDP rx. + * + * during kernel boot up, kernel write dpcd 0x170 = 5. + * this notify eDP rx psr enable and let rx check crc. + * rx fw will start checking crc for rx internal logic. + * crc read count within dpcd 0x246 is not updated and + * value is 0. when eDP tx driver wants to read rx crc + * from dpcd 0x246, 0x270, read count 0 lead tx driver + * timeout. + * + * to avoid this, we add this debugfs to let test app to disbable + * rx crc checking for rx internal logic. then test app can read + * non-zero crc read count. + * + * expected app sequence is as below: + * 1. disable eDP PHY and notify eDP rx with dpcd 0x600 = 2. + * 2. echo 0x1 /sys/kernel/debug/dri/0/eDP-X/disallow_edp_enter_psr + * 3. enable eDP PHY and notify eDP rx with dpcd 0x600 = 1 but + * without dpcd 0x170 = 5. + * 4. read crc from rx dpcd 0x270, 0x246, etc. + * 5. echo 0x0 /sys/kernel/debug/dri/0/eDP-X/disallow_edp_enter_psr. + * this will let eDP back to normal with psr setup dpcd 0x170 = 5. + */ +static int disallow_edp_enter_psr_set(void *data, u64 val) +{ + struct amdgpu_dm_connector *aconnector = data; + + aconnector->disallow_edp_enter_psr = val ? true : false; + return 0; +} + static int dmub_trace_mask_set(void *data, u64 val) { struct amdgpu_device *adev = data; @@ -3116,6 +3163,10 @@ DEFINE_DEBUGFS_ATTRIBUTE(allow_edp_hotplug_detection_fops, allow_edp_hotplug_detection_get, allow_edp_hotplug_detection_set, "%llu\n"); +DEFINE_DEBUGFS_ATTRIBUTE(disallow_edp_enter_psr_fops, + disallow_edp_enter_psr_get, + disallow_edp_enter_psr_set, "%llu\n"); + DEFINE_SHOW_ATTRIBUTE(current_backlight); DEFINE_SHOW_ATTRIBUTE(target_backlight); @@ -3289,6 +3340,8 @@ void connector_debugfs_init(struct amdgpu_dm_connector *connector) &edp_ilr_debugfs_fops); debugfs_create_file("allow_edp_hotplug_detection", 0644, dir, connector, &allow_edp_hotplug_detection_fops); + debugfs_create_file("disallow_edp_enter_psr", 0644, dir, connector, + &disallow_edp_enter_psr_fops); } for (i = 0; i < ARRAY_SIZE(connector_debugfs_entries); i++) { |