This patch adds support for eDP backlight control using DPCD registers to backlight hooks in intel_panel. It checks for backlight control over AUX channel capability and sets up function pointers to get and set the backlight brightness level if supported. v2: Moved backlight functions from intel_dp.c into a new file intel_dp_aux_backlight.c. Also moved reading of eDP display control registers to intel_dp_get_dpcd v3: Correct some formatting mistakes v4: Updated to use AUX backlight control if PWM control is not possible (Jani) This patch depends on http://patchwork.freedesktop.org/patch/64253/ Cc: Bob Paauwe <bob.j.paauwe@xxxxxxxxx> Cc: Jani Nikula <jani.nikula@xxxxxxxxx> Acked-by: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx> Signed-off-by: Yetunde Adebisi <yetundex.adebisi@xxxxxxxxx> --- drivers/gpu/drm/i915/Makefile | 1 + drivers/gpu/drm/i915/intel_dp.c | 17 ++- drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 181 ++++++++++++++++++++++++++ drivers/gpu/drm/i915/intel_drv.h | 6 + drivers/gpu/drm/i915/intel_panel.c | 4 + 5 files changed, 203 insertions(+), 6 deletions(-) create mode 100644 drivers/gpu/drm/i915/intel_dp_aux_backlight.c diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile index 0851de07..41250cc 100644 --- a/drivers/gpu/drm/i915/Makefile +++ b/drivers/gpu/drm/i915/Makefile @@ -77,6 +77,7 @@ i915-y += dvo_ch7017.o \ dvo_tfp410.o \ intel_crt.o \ intel_ddi.o \ + intel_dp_aux_backlight.o \ intel_dp_link_training.o \ intel_dp_mst.o \ intel_dp.o \ diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 31ba241..2b60b83 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3188,7 +3188,7 @@ static void chv_dp_post_pll_disable(struct intel_encoder *encoder) * Sinks are *supposed* to come up within 1ms from an off state, but we're also * supposed to retry 3 times per the spec. */ -static ssize_t +ssize_t intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset, void *buffer, size_t size) { @@ -3855,7 +3855,6 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); struct drm_device *dev = dig_port->base.base.dev; struct drm_i915_private *dev_priv = dev->dev_private; - uint8_t rev; if (intel_dp_dpcd_read_wake(&intel_dp->aux, 0x000, intel_dp->dpcd, sizeof(intel_dp->dpcd)) < 0) @@ -3891,6 +3890,15 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) DRM_DEBUG_KMS("PSR2 %s on sink", dev_priv->psr.psr2_support ? "supported" : "not supported"); } + + /* Read the eDP Display control capabilities registers */ + memset(intel_dp->edp_dpcd, 0, sizeof(intel_dp->edp_dpcd)); + if ((intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) && + (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_EDP_DPCD_REV, + intel_dp->edp_dpcd, sizeof(intel_dp->edp_dpcd)) == + sizeof(intel_dp->edp_dpcd))) + DRM_DEBUG_KMS("EDP DPCD : %*ph\n", (int) sizeof(intel_dp->edp_dpcd), + intel_dp->edp_dpcd); } DRM_DEBUG_KMS("Display Port TPS3 support: source %s, sink %s\n", @@ -3898,10 +3906,7 @@ intel_dp_get_dpcd(struct intel_dp *intel_dp) yesno(drm_dp_tps3_supported(intel_dp->dpcd))); /* Intermediate frequency support */ - if (is_edp(intel_dp) && - (intel_dp->dpcd[DP_EDP_CONFIGURATION_CAP] & DP_DPCD_DISPLAY_CONTROL_CAPABLE) && - (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_EDP_DPCD_REV, &rev, 1) == 1) && - (rev >= 0x03)) { /* eDp v1.4 or higher */ + if (is_edp(intel_dp) && (intel_dp->edp_dpcd[0] >= 0x03)) { /* eDp v1.4 or higher */ __le16 sink_rates[DP_MAX_SUPPORTED_RATES]; int i; diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c new file mode 100644 index 0000000..3bba6b5 --- /dev/null +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c @@ -0,0 +1,181 @@ +/* + * Copyright © 2015 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS + * IN THE SOFTWARE. + * + */ + +#include "intel_drv.h" + +static bool is_aux_backlight_enabled(struct drm_dp_aux *aux) +{ + uint8_t read_val = 0; + + if (intel_dp_dpcd_read_wake(aux, DP_EDP_DISPLAY_CONTROL_REGISTER, + &read_val, sizeof(read_val)) < 0) + DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", + DP_EDP_DISPLAY_CONTROL_REGISTER); + + return read_val & DP_EDP_BACKLIGHT_ENABLE; +} + +static void set_aux_backlight_enable(struct intel_dp *intel_dp, bool enable) +{ + uint8_t reg_val = 0; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_EDP_DISPLAY_CONTROL_REGISTER, + ®_val, sizeof(reg_val)) < 0) { + DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", + DP_EDP_DISPLAY_CONTROL_REGISTER); + return; + } + if (enable) + reg_val |= DP_EDP_BACKLIGHT_ENABLE; + else + reg_val &= ~(DP_EDP_BACKLIGHT_ENABLE); + + if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_DISPLAY_CONTROL_REGISTER, + reg_val) < 0) { + DRM_DEBUG_KMS("Failed to %s aux backlight\n", + enable ? "enable" : "disable"); + } +} + +/* + * Read the current backlight value from DPCD register(s) based + * on if 8-bit(MSB) or 16-bit(MSB and LSB) values are supported + */ +static uint32_t intel_dp_aux_get_backlight(struct intel_connector *connector) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); + uint8_t read_val[2] = { 0x0 }; + uint16_t level = 0; + + if (intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, + &read_val, sizeof(read_val)) < 0) { + DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n", + DP_EDP_BACKLIGHT_BRIGHTNESS_MSB); + return 0; + } + level = read_val[0]; + if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) + level = (read_val[0] << 8 | read_val[1]); + + return level; +} + +/* + * Sends the current backlight level over the aux channel, checking if its using + * 8-bit or 16 bit value (MSB and LSB) + */ +static void +intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); + uint8_t vals[2] = { 0x0 }; + + vals[0] = level; + + /* Write the MSB and/or LSB */ + if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) { + vals[0] = (level & 0xFF00) >> 8; + vals[1] = (level & 0xFF); + } + if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, + vals, sizeof(vals)) < 0) { + DRM_DEBUG_KMS("Failed to write aux backlight level\n"); + return; + } +} + +static void intel_dp_aux_enable_backlight(struct intel_connector *connector) +{ + set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), true); +} + +static void intel_dp_aux_disable_backlight(struct intel_connector *connector) +{ + set_aux_backlight_enable(enc_to_intel_dp(&connector->encoder->base), false); +} + +static int intel_dp_aux_setup_backlight(struct intel_connector *connector, + enum pipe pipe) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); + struct intel_panel *panel = &connector->panel; + + if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT) + panel->backlight.max = 0xFFFF; + else + panel->backlight.max = 0xFF; + + panel->backlight.min = 0; + + panel->backlight.level = intel_dp_aux_get_backlight(connector); + panel->backlight.enabled = is_aux_backlight_enabled(&intel_dp->aux); + + return 0; +} + +static bool +intel_dp_aux_display_control_capable(struct intel_connector *connector) +{ + struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base); + uint8_t dpcd_buf = 0; + + /* Check the eDP Display control capabilities registers to determine if + * the panel can support backlight control over the aux channel + */ + + if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP && + (intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) && + !(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) { + + DRM_DEBUG_KMS("AUX Backlight Control Supported!\n"); + set_aux_backlight_enable(intel_dp, true); + if ((intel_dp_dpcd_read_wake(&intel_dp->aux, + DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &dpcd_buf, 1) == 1) && + ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) == + DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET)) + drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, + (dpcd_buf | DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD)); + + return true; + } + return false; +} + +int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector) +{ + struct intel_panel *panel = &intel_connector->panel; + + if (!intel_dp_aux_display_control_capable(intel_connector)) + return -ENODEV; + + panel->backlight.setup = intel_dp_aux_setup_backlight; + panel->backlight.enable = intel_dp_aux_enable_backlight; + panel->backlight.disable = intel_dp_aux_disable_backlight; + panel->backlight.set = intel_dp_aux_set_backlight; + panel->backlight.get = intel_dp_aux_get_backlight; + + return 0; +} diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 798463e..3d03bea 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -753,6 +753,7 @@ struct intel_dp { uint8_t dpcd[DP_RECEIVER_CAP_SIZE]; uint8_t psr_dpcd[EDP_PSR_RECEIVER_CAP_SIZE]; uint8_t downstream_ports[DP_MAX_DOWNSTREAM_PORTS]; + uint8_t edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]; /* sink rates as reported by DP_SUPPORTED_LINK_RATES */ uint8_t num_sink_rates; int sink_rates[DP_MAX_SUPPORTED_RATES]; @@ -1279,6 +1280,11 @@ void intel_dp_compute_rate(struct intel_dp *intel_dp, int port_clock, bool intel_dp_source_supports_hbr2(struct intel_dp *intel_dp); bool intel_dp_get_link_status(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]); +ssize_t intel_dp_dpcd_read_wake(struct drm_dp_aux *aux, unsigned int offset, + void *buffer, size_t size); + +/* intel_dp_aux_backlight.c */ +int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector); /* intel_dp_mst.c */ int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_id); diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c index 72183a0..cc76f8c 100644 --- a/drivers/gpu/drm/i915/intel_panel.c +++ b/drivers/gpu/drm/i915/intel_panel.c @@ -1760,6 +1760,10 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel) struct drm_device *dev = intel_connector->base.dev; struct drm_i915_private *dev_priv = dev->dev_private; + if (intel_connector->base.connector_type == DRM_MODE_CONNECTOR_eDP && + intel_dp_aux_init_backlight_funcs(intel_connector) == 0) + return; + if (IS_BROXTON(dev)) { panel->backlight.setup = bxt_setup_backlight; panel->backlight.enable = bxt_enable_backlight; -- 1.9.3 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
