diff options
Diffstat (limited to 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 161 |
1 files changed, 137 insertions, 24 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 bd798b6bdf0f..f4e4c42341b9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -1758,6 +1758,61 @@ static struct drm_mode_config_helper_funcs amdgpu_dm_mode_config_helperfuncs = { .atomic_commit_tail = amdgpu_dm_atomic_commit_tail }; +static void update_connector_ext_caps(struct amdgpu_dm_connector *aconnector) +{ + u32 max_cll, min_cll, max, min, q, r; + struct amdgpu_dm_backlight_caps *caps; + struct amdgpu_display_manager *dm; + struct drm_connector *conn_base; + struct amdgpu_device *adev; + static const u8 pre_computed_values[] = { + 50, 51, 52, 53, 55, 56, 57, 58, 59, 61, 62, 63, 65, 66, 68, 69, + 71, 72, 74, 75, 77, 79, 81, 82, 84, 86, 88, 90, 92, 94, 96, 98}; + + if (!aconnector || !aconnector->dc_link) + return; + + conn_base = &aconnector->base; + adev = conn_base->dev->dev_private; + dm = &adev->dm; + caps = &dm->backlight_caps; + caps->ext_caps = &aconnector->dc_link->dpcd_sink_ext_caps; + caps->aux_support = false; + max_cll = conn_base->hdr_sink_metadata.hdmi_type1.max_cll; + min_cll = conn_base->hdr_sink_metadata.hdmi_type1.min_cll; + + if (caps->ext_caps->bits.oled == 1 || + caps->ext_caps->bits.sdr_aux_backlight_control == 1 || + caps->ext_caps->bits.hdr_aux_backlight_control == 1) + caps->aux_support = true; + + /* From the specification (CTA-861-G), for calculating the maximum + * luminance we need to use: + * Luminance = 50*2**(CV/32) + * Where CV is a one-byte value. + * For calculating this expression we may need float point precision; + * to avoid this complexity level, we take advantage that CV is divided + * by a constant. From the Euclids division algorithm, we know that CV + * can be written as: CV = 32*q + r. Next, we replace CV in the + * Luminance expression and get 50*(2**q)*(2**(r/32)), hence we just + * need to pre-compute the value of r/32. For pre-computing the values + * We just used the following Ruby line: + * (0...32).each {|cv| puts (50*2**(cv/32.0)).round} + * The results of the above expressions can be verified at + * pre_computed_values. + */ + q = max_cll >> 5; + r = max_cll % 32; + max = (1 << q) * pre_computed_values[r]; + + // min luminance: maxLum * (CV/255)^2 / 100 + q = DIV_ROUND_CLOSEST(min_cll, 255); + min = max * DIV_ROUND_CLOSEST((q * q), 100); + + caps->aux_max_input_signal = max; + caps->aux_min_input_signal = min; +} + static void amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector) { @@ -1872,7 +1927,7 @@ amdgpu_dm_update_connector_after_detect(struct amdgpu_dm_connector *aconnector) aconnector->edid); } amdgpu_dm_update_freesync_caps(connector, aconnector->edid); - + update_connector_ext_caps(aconnector); } else { drm_dp_cec_unset_edid(&aconnector->dm_dp_aux.aux); amdgpu_dm_update_freesync_caps(connector, NULL); @@ -2484,6 +2539,7 @@ static int amdgpu_dm_mode_config_init(struct amdgpu_device *adev) #define AMDGPU_DM_DEFAULT_MIN_BACKLIGHT 12 #define AMDGPU_DM_DEFAULT_MAX_BACKLIGHT 255 +#define AUX_BL_DEFAULT_TRANSITION_TIME_MS 50 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) ||\ defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) @@ -2498,9 +2554,11 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm) amdgpu_acpi_get_backlight_caps(dm->adev, &caps); if (caps.caps_valid) { + dm->backlight_caps.caps_valid = true; + if (caps.aux_support) + return; dm->backlight_caps.min_input_signal = caps.min_input_signal; dm->backlight_caps.max_input_signal = caps.max_input_signal; - dm->backlight_caps.caps_valid = true; } else { dm->backlight_caps.min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT; @@ -2508,40 +2566,95 @@ static void amdgpu_dm_update_backlight_caps(struct amdgpu_display_manager *dm) AMDGPU_DM_DEFAULT_MAX_BACKLIGHT; } #else + if (dm->backlight_caps.aux_support) + return; + dm->backlight_caps.min_input_signal = AMDGPU_DM_DEFAULT_MIN_BACKLIGHT; dm->backlight_caps.max_input_signal = AMDGPU_DM_DEFAULT_MAX_BACKLIGHT; #endif } +static int set_backlight_via_aux(struct dc_link *link, uint32_t brightness) +{ + bool rc; + + if (!link) + return 1; + + rc = dc_link_set_backlight_level_nits(link, true, brightness, + AUX_BL_DEFAULT_TRANSITION_TIME_MS); + + return rc ? 0 : 1; +} + +static u32 convert_brightness(const struct amdgpu_dm_backlight_caps *caps, + const uint32_t user_brightness) +{ + u32 min, max, conversion_pace; + u32 brightness = user_brightness; + + if (!caps) + goto out; + + if (!caps->aux_support) { + max = caps->max_input_signal; + min = caps->min_input_signal; + /* + * The brightness input is in the range 0-255 + * It needs to be rescaled to be between the + * requested min and max input signal + * It also needs to be scaled up by 0x101 to + * match the DC interface which has a range of + * 0 to 0xffff + */ + conversion_pace = 0x101; + brightness = + user_brightness + * conversion_pace + * (max - min) + / AMDGPU_MAX_BL_LEVEL + + min * conversion_pace; + } else { + /* TODO + * We are doing a linear interpolation here, which is OK but + * does not provide the optimal result. We probably want + * something close to the Perceptual Quantizer (PQ) curve. + */ + max = caps->aux_max_input_signal; + min = caps->aux_min_input_signal; + + brightness = (AMDGPU_MAX_BL_LEVEL - user_brightness) * min + + user_brightness * max; + // Multiple the value by 1000 since we use millinits + brightness *= 1000; + brightness = DIV_ROUND_CLOSEST(brightness, AMDGPU_MAX_BL_LEVEL); + } + +out: + return brightness; +} + 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; - uint32_t brightness = bd->props.brightness; + struct dc_link *link = NULL; + u32 brightness; + bool rc; amdgpu_dm_update_backlight_caps(dm); caps = dm->backlight_caps; - /* - * The brightness input is in the range 0-255 - * It needs to be rescaled to be between the - * requested min and max input signal - * - * It also needs to be scaled up by 0x101 to - * match the DC interface which has a range of - * 0 to 0xffff - */ - brightness = - brightness - * 0x101 - * (caps.max_input_signal - caps.min_input_signal) - / AMDGPU_MAX_BL_LEVEL - + caps.min_input_signal * 0x101; - - if (dc_link_set_backlight_level(dm->backlight_link, - brightness, 0)) - return 0; - else - return 1; + + link = (struct dc_link *)dm->backlight_link; + + brightness = convert_brightness(&caps, bd->props.brightness); + // Change brightness based on AUX property + if (caps.aux_support) + return set_backlight_via_aux(link, brightness); + + rc = dc_link_set_backlight_level(dm->backlight_link, brightness, 0); + + return rc ? 0 : 1; } static int amdgpu_dm_backlight_get_brightness(struct backlight_device *bd) |