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drm/i915/dsi: CABC support for Panel PWM backlight control

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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
This commit is contained in:
Deepak M
2016-04-26 16:14:26 +03:00
committed by Jani Nikula
parent 90198355b8
commit 1ecc1c6cb7
3 changed files with 40 additions and 0 deletions
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17
drivers/gpu/drm/i915/intel_dsi.c
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@@ -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;