From 1ecc1c6cb7d3549d8854b0d6ac5a86a622ca6fa3 Mon Sep 17 00:00:00 2001 From: Deepak M Date: Tue, 26 Apr 2016 16:14:26 +0300 Subject: [PATCH] drm/i915/dsi: CABC support for Panel PWM backlight control In CABC (Content Adaptive Brightness Control) content grey level scale can be increased while simultaneously decreasing brightness of the backlight to achieve same perceived brightness. The CABC is not standardized and panel vendors are free to follow their implementation. The CABC implementaion here assumes that the panels use standard SW register for control. CABC is supported only when the PWM source for backlight is from the panel. v2 by Jani: rebase, renames, check cabc support earlier, etc. Signed-off-by: Deepak M Signed-off-by: Jani Nikula Link: http://patchwork.freedesktop.org/patch/msgid/883faade74d2e598b143221ccc7df6daf4393a13.1461676337.git.jani.nikula@intel.com --- drivers/gpu/drm/i915/intel_dsi.c | 17 ++++++++++++++ drivers/gpu/drm/i915/intel_dsi.h | 1 + .../gpu/drm/i915/intel_dsi_dcs_backlight.c | 22 +++++++++++++++++++ 3 files changed, 40 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index edb6bea870d6..4009618a5b34 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -1489,11 +1489,28 @@ void intel_dsi_init(struct drm_device *dev) intel_dsi->dcs_backlight_ports = BIT(PORT_A) | BIT(PORT_C); break; } + + switch (dev_priv->vbt.dsi.config->dl_dcs_cabc_ports) { + case DL_DCS_PORT_A: + intel_dsi->dcs_cabc_ports = BIT(PORT_A); + break; + case DL_DCS_PORT_C: + intel_dsi->dcs_cabc_ports = BIT(PORT_C); + break; + default: + case DL_DCS_PORT_A_AND_C: + intel_dsi->dcs_cabc_ports = BIT(PORT_A) | BIT(PORT_C); + break; + } } else { intel_dsi->ports = BIT(port); intel_dsi->dcs_backlight_ports = BIT(port); + intel_dsi->dcs_cabc_ports = BIT(port); } + if (!dev_priv->vbt.dsi.config->cabc_supported) + intel_dsi->dcs_cabc_ports = 0; + /* Create a DSI host (and a device) for each port. */ for_each_dsi_port(port, intel_dsi->ports) { struct intel_dsi_host *host; diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h index b00fb3fbb0b1..5967ea6d6045 100644 --- a/drivers/gpu/drm/i915/intel_dsi.h +++ b/drivers/gpu/drm/i915/intel_dsi.h @@ -80,6 +80,7 @@ struct intel_dsi { u8 dual_link; u16 dcs_backlight_ports; + u16 dcs_cabc_ports; u8 pixel_overlap; u32 port_bits; diff --git a/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c b/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c index 7f9bbffa7f8c..f0dc427743f8 100644 --- a/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c +++ b/drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c @@ -33,6 +33,12 @@ #define CONTROL_DISPLAY_DD (1 << 3) #define CONTROL_DISPLAY_BL (1 << 2) +#define POWER_SAVE_OFF (0 << 0) +#define POWER_SAVE_LOW (1 << 0) +#define POWER_SAVE_MEDIUM (2 << 0) +#define POWER_SAVE_HIGH (3 << 0) +#define POWER_SAVE_OUTDOOR_MODE (4 << 0) + #define PANEL_PWM_MAX_VALUE 0xFF static u32 dcs_get_backlight(struct intel_connector *connector) @@ -79,6 +85,14 @@ static void dcs_disable_backlight(struct intel_connector *connector) dcs_set_backlight(connector, 0); + for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) { + u8 cabc = POWER_SAVE_OFF; + + dsi_device = intel_dsi->dsi_hosts[port]->device; + mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, + &cabc, sizeof(cabc)); + } + for_each_dsi_port(port, intel_dsi->dcs_backlight_ports) { u8 ctrl = 0; @@ -120,6 +134,14 @@ static void dcs_enable_backlight(struct intel_connector *connector) &ctrl, sizeof(ctrl)); } + for_each_dsi_port(port, intel_dsi->dcs_cabc_ports) { + u8 cabc = POWER_SAVE_MEDIUM; + + dsi_device = intel_dsi->dsi_hosts[port]->device; + mipi_dsi_dcs_write(dsi_device, MIPI_DCS_WRITE_POWER_SAVE, + &cabc, sizeof(cabc)); + } + dcs_set_backlight(connector, panel->backlight.level); } -- GitLab