diff options
| author | Deepak M <m.deepak@intel.com> | 2016-04-26 16:14:26 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2016-05-17 16:12:39 +0300 |
| commit | 1ecc1c6cb7d3549d8854b0d6ac5a86a622ca6fa3 (patch) | |
| tree | 929fe0744596f8bf26f1a8b237507234b8942dfa /drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c | |
| parent | 90198355b83c79e2158ec591085858b191f08502 (diff) | |
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 <m.deepak@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/883faade74d2e598b143221ccc7df6daf4393a13.1461676337.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dsi_dcs_backlight.c | 22 |
1 files changed, 22 insertions, 0 deletions
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); } |