From 118b4627d6777d8d422786ded6a0bd8e2934d11f Mon Sep 17 00:00:00 2001 From: Mikita Lipski Date: Wed, 14 Apr 2021 14:51:02 -0400 Subject: [PATCH] drm/amd/display: multi-eDP backlight support [why] Currently the assumption is that we are using a single eDP connector so there will only be one backlight object. Need changes to allow brightness update and reading for multiple eDP connectors. [how] - register a single device - turn backlight link from a pointer to an array of pointers - update brightness of all eDP links at the same time when request is registered - read brightness level only of the primary eDP panel - turn current_backlight_pwm and targer_backlight_pwm debugfs enteries into per connector enteries. Signed-off-by: Mikita Lipski Reviewed-by: Nicholas Kazlauskas Acked-by: Wayne Lin Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 42 ++++++++--- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 6 +- .../drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 86 ++++++++++++---------- 3 files changed, 82 insertions(+), 52 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 15070bf..e5efae6 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -3415,22 +3415,37 @@ static int amdgpu_dm_backlight_update_status(struct backlight_device *bd) { struct amdgpu_display_manager *dm = bl_get_data(bd); struct amdgpu_dm_backlight_caps caps; - struct dc_link *link = NULL; + struct dc_link *link[AMDGPU_DM_MAX_NUM_EDP]; u32 brightness; bool rc; + int i; amdgpu_dm_update_backlight_caps(dm); caps = dm->backlight_caps; - link = (struct dc_link *)dm->backlight_link; + for (i = 0; i < dm->num_of_edps; i++) + link[i] = (struct dc_link *)dm->backlight_link[i]; brightness = convert_brightness_from_user(&caps, bd->props.brightness); // Change brightness based on AUX property - if (caps.aux_support) - rc = dc_link_set_backlight_level_nits(link, true, brightness, - AUX_BL_DEFAULT_TRANSITION_TIME_MS); - else - rc = dc_link_set_backlight_level(dm->backlight_link, brightness, 0); + if (caps.aux_support) { + for (i = 0; i < dm->num_of_edps; i++) { + rc = dc_link_set_backlight_level_nits(link[i], true, brightness, + AUX_BL_DEFAULT_TRANSITION_TIME_MS); + if (!rc) { + DRM_ERROR("DM: Failed to update backlight via AUX on eDP[%d]\n", i); + break; + } + } + } else { + for (i = 0; i < dm->num_of_edps; i++) { + rc = dc_link_set_backlight_level(dm->backlight_link[i], brightness, 0); + if (!rc) { + DRM_ERROR("DM: Failed to update backlight on eDP[%d]\n", i); + break; + } + } + } return rc ? 0 : 1; } @@ -3444,7 +3459,7 @@ static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd) caps = dm->backlight_caps; if (caps.aux_support) { - struct dc_link *link = (struct dc_link *)dm->backlight_link; + struct dc_link *link = (struct dc_link *)dm->backlight_link[0]; u32 avg, peak; bool rc; @@ -3453,7 +3468,7 @@ static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd) return bd->props.brightness; return convert_brightness_to_user(&caps, avg); } else { - int ret = dc_link_get_backlight_level(dm->backlight_link); + int ret = dc_link_get_backlight_level(dm->backlight_link[0]); if (ret == DC_ERROR_UNEXPECTED) return bd->props.brightness; @@ -3550,10 +3565,13 @@ static void register_backlight_device(struct amdgpu_display_manager *dm, * DM initialization because not having a backlight control * is better then a black screen. */ - amdgpu_dm_register_backlight_device(dm); + if (!dm->backlight_dev) + amdgpu_dm_register_backlight_device(dm); - if (dm->backlight_dev) - dm->backlight_link = link; + if (dm->backlight_dev) { + dm->backlight_link[dm->num_of_edps] = link; + dm->num_of_edps++; + } } #endif } diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h index 47c658c..724ace5 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h @@ -46,6 +46,7 @@ #define AMDGPU_DM_MAX_CRTC 6 +#define AMDGPU_DM_MAX_NUM_EDP 2 /* #include "include/amdgpu_dal_power_if.h" #include "amdgpu_dm_irq.h" @@ -354,7 +355,10 @@ struct amdgpu_display_manager { struct backlight_device *backlight_dev; - const struct dc_link *backlight_link; + const struct dc_link *backlight_link[AMDGPU_DM_MAX_NUM_EDP]; + + uint8_t num_of_edps; + struct amdgpu_dm_backlight_caps backlight_caps; struct mod_freesync *freesync_module; 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 8bf0b56..9fbbd01 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 @@ -2377,6 +2377,44 @@ unlock: return size; } +/* + * Backlight at this moment. Read only. + * As written to display, taking ABM and backlight lut into account. + * Ranges from 0x0 to 0x10000 (= 100% PWM) + * + * Example usage: cat /sys/kernel/debug/dri/0/eDP-1/current_backlight + */ +static int current_backlight_show(struct seq_file *m, void *unused) +{ + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(m->private); + struct dc_link *link = aconnector->dc_link; + unsigned int backlight; + + backlight = dc_link_get_backlight_level(link); + seq_printf(m, "0x%x\n", backlight); + + return 0; +} + +/* + * Backlight value that is being approached. Read only. + * As written to display, taking ABM and backlight lut into account. + * Ranges from 0x0 to 0x10000 (= 100% PWM) + * + * Example usage: cat /sys/kernel/debug/dri/0/eDP-1/target_backlight + */ +static int target_backlight_show(struct seq_file *m, void *unused) +{ + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(m->private); + struct dc_link *link = aconnector->dc_link; + unsigned int backlight; + + backlight = dc_link_get_target_backlight_pwm(link); + seq_printf(m, "0x%x\n", backlight); + + return 0; +} + DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support); DEFINE_SHOW_ATTRIBUTE(dmub_fw_state); DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer); @@ -2611,6 +2649,9 @@ DEFINE_DEBUGFS_ATTRIBUTE(dmcub_trace_event_state_fops, dmcub_trace_event_state_g DEFINE_DEBUGFS_ATTRIBUTE(psr_fops, psr_get, NULL, "%llu\n"); +DEFINE_SHOW_ATTRIBUTE(current_backlight); +DEFINE_SHOW_ATTRIBUTE(target_backlight); + static const struct { char *name; const struct file_operations *fops; @@ -2634,8 +2675,13 @@ void connector_debugfs_init(struct amdgpu_dm_connector *connector) dp_debugfs_entries[i].fops); } } - if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) + if (connector->base.connector_type == DRM_MODE_CONNECTOR_eDP) { debugfs_create_file_unsafe("psr_state", 0444, dir, connector, &psr_fops); + debugfs_create_file("amdgpu_current_backlight_pwm", 0444, dir, connector, + ¤t_backlight_fops); + debugfs_create_file("amdgpu_target_backlight_pwm", 0444, dir, connector, + &target_backlight_fops); + } for (i = 0; i < ARRAY_SIZE(connector_debugfs_entries); i++) { debugfs_create_file(connector_debugfs_entries[i].name, @@ -2938,38 +2984,6 @@ static ssize_t dtn_log_write( return size; } -/* - * Backlight at this moment. Read only. - * As written to display, taking ABM and backlight lut into account. - * Ranges from 0x0 to 0x10000 (= 100% PWM) - */ -static int current_backlight_show(struct seq_file *m, void *unused) -{ - struct amdgpu_device *adev = (struct amdgpu_device *)m->private; - struct amdgpu_display_manager *dm = &adev->dm; - - unsigned int backlight = dc_link_get_backlight_level(dm->backlight_link); - - seq_printf(m, "0x%x\n", backlight); - return 0; -} - -/* - * Backlight value that is being approached. Read only. - * As written to display, taking ABM and backlight lut into account. - * Ranges from 0x0 to 0x10000 (= 100% PWM) - */ -static int target_backlight_show(struct seq_file *m, void *unused) -{ - struct amdgpu_device *adev = (struct amdgpu_device *)m->private; - struct amdgpu_display_manager *dm = &adev->dm; - - unsigned int backlight = dc_link_get_target_backlight_pwm(dm->backlight_link); - - seq_printf(m, "0x%x\n", backlight); - return 0; -} - static int mst_topo_show(struct seq_file *m, void *unused) { struct amdgpu_device *adev = (struct amdgpu_device *)m->private; @@ -3152,8 +3166,6 @@ static int visual_confirm_get(void *data, u64 *val) return 0; } -DEFINE_SHOW_ATTRIBUTE(current_backlight); -DEFINE_SHOW_ATTRIBUTE(target_backlight); DEFINE_SHOW_ATTRIBUTE(mst_topo); DEFINE_DEBUGFS_ATTRIBUTE(visual_confirm_fops, visual_confirm_get, visual_confirm_set, "%llu\n"); @@ -3233,10 +3245,6 @@ void dtn_debugfs_init(struct amdgpu_device *adev) struct drm_minor *minor = adev_to_drm(adev)->primary; struct dentry *root = minor->debugfs_root; - debugfs_create_file("amdgpu_current_backlight_pwm", 0444, - root, adev, ¤t_backlight_fops); - debugfs_create_file("amdgpu_target_backlight_pwm", 0444, - root, adev, &target_backlight_fops); debugfs_create_file("amdgpu_mst_topology", 0444, root, adev, &mst_topo_fops); debugfs_create_file("amdgpu_dm_dtn_log", 0644, root, adev, -- 2.7.4