[Intel-gfx] [PATCH] drm/i915: CABC support for backlight control
Deepak, M
m.deepak at intel.com
Mon Sep 14 08:31:15 PDT 2015
>-----Original Message-----
>From: Jani Nikula [mailto:jani.nikula at linux.intel.com]
>Sent: Monday, September 14, 2015 5:51 PM
>To: Deepak, M; intel-gfx at lists.freedesktop.org
>Cc: Deepak, M
>Subject: Re: [Intel-gfx] [PATCH] drm/i915: CABC support for backlight control
>
>On Mon, 14 Sep 2015, Deepak M <m.deepak at intel.com> wrote:
>> 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.
>>
>> In this design there will be no PWM signal from the SoC and DCS
>> commands are sent to enable and control the backlight brightness.
>
>I think CABC is a confusing name for this. At the high level, this should be
>called, say, DCS backlight control. I think CABC is a special case of backlight
>control in the DSI panel; there are panels with brightness control via DCS
>*without* CABC.
>
>See further comments inline.
>
>>
>> v2:
>> - Created a new backlight driver for cabc, which will be registered
>> only when it cabc is supported by panel. (Daniel Vetter)
>> v3:
>> - Use for_each_dsi_port macro for handling port C also (Gaurav)
>> - Rebase
>>
>> Signed-off-by: Deepak M <m.deepak at intel.com>
>> ---
>> drivers/gpu/drm/i915/Makefile | 1 +
>> drivers/gpu/drm/i915/intel_dsi.c | 18 +-
>> drivers/gpu/drm/i915/intel_dsi_cabc.c | 310
>+++++++++++++++++++++++++++++++++
>> drivers/gpu/drm/i915/intel_dsi_cabc.h | 46 +++++
>> drivers/gpu/drm/i915/intel_panel.c | 23 ++-
>> include/video/mipi_display.h | 8 +
>> 6 files changed, 399 insertions(+), 7 deletions(-) create mode
>> 100644 drivers/gpu/drm/i915/intel_dsi_cabc.c
>> create mode 100644 drivers/gpu/drm/i915/intel_dsi_cabc.h
>>
>> diff --git a/drivers/gpu/drm/i915/Makefile
>> b/drivers/gpu/drm/i915/Makefile index 44d290a..d87c690 100644
>> --- a/drivers/gpu/drm/i915/Makefile
>> +++ b/drivers/gpu/drm/i915/Makefile
>> @@ -82,6 +82,7 @@ i915-y += dvo_ch7017.o \
>> intel_dsi.o \
>> intel_dsi_panel_vbt.o \
>> intel_dsi_pll.o \
>> + intel_dsi_cabc.o \
>> intel_dvo.o \
>> intel_hdmi.o \
>> intel_i2c.o \
>> diff --git a/drivers/gpu/drm/i915/intel_dsi.c
>> b/drivers/gpu/drm/i915/intel_dsi.c
>> index 781c267..1d98ed8 100644
>> --- a/drivers/gpu/drm/i915/intel_dsi.c
>> +++ b/drivers/gpu/drm/i915/intel_dsi.c
>> @@ -35,6 +35,7 @@
>> #include "i915_drv.h"
>> #include "intel_drv.h"
>> #include "intel_dsi.h"
>> +#include "intel_dsi_cabc.h"
>>
>> static const struct {
>> u16 panel_id;
>> @@ -398,7 +399,10 @@ static void intel_dsi_enable(struct intel_encoder
>*encoder)
>> intel_dsi_port_enable(encoder);
>> }
>>
>> - intel_panel_enable_backlight(intel_dsi->attached_connector);
>> + if (dev_priv->vbt.dsi.config->cabc_supported)
>> + cabc_enable_backlight(intel_dsi->attached_connector);
>> + else
>> + intel_panel_enable_backlight(intel_dsi-
>>attached_connector);
>
>See my patch at [1] for how I think all of this should be handled.
>
>[1] http://mid.gmane.org/cover.1442227790.git.jani.nikula@intel.com
>
[Deepak M] Will go through that patch.
>> }
>>
>> static void intel_dsi_pre_enable(struct intel_encoder *encoder) @@
>> -458,12 +462,17 @@ static void intel_dsi_enable_nop(struct
>> intel_encoder *encoder)
>>
>> static void intel_dsi_pre_disable(struct intel_encoder *encoder) {
>> + struct drm_device *dev = encoder->base.dev;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
>> enum port port;
>>
>> DRM_DEBUG_KMS("\n");
>>
>> - intel_panel_disable_backlight(intel_dsi->attached_connector);
>> + if (dev_priv->vbt.dsi.config->cabc_supported)
>> + cabc_disable_backlight(intel_dsi->attached_connector);
>> + else
>> + intel_panel_disable_backlight(intel_dsi-
>>attached_connector);
>>
>> if (is_vid_mode(intel_dsi)) {
>> /* Send Shutdown command to the panel in LP mode */ @@ -
>1133,7
>> +1142,10 @@ void intel_dsi_init(struct drm_device *dev)
>> }
>>
>> intel_panel_init(&intel_connector->panel, fixed_mode, NULL);
>> - intel_panel_setup_backlight(connector, INVALID_PIPE);
>> + if (dev_priv->vbt.dsi.config->cabc_supported)
>> + cabc_setup_backlight(connector, INVALID_PIPE);
>> + else
>> + intel_panel_setup_backlight(connector, INVALID_PIPE);
>>
>> return;
>>
>> diff --git a/drivers/gpu/drm/i915/intel_dsi_cabc.c
>> b/drivers/gpu/drm/i915/intel_dsi_cabc.c
>> new file mode 100644
>> index 0000000..c2fcd95
>> --- /dev/null
>> +++ b/drivers/gpu/drm/i915/intel_dsi_cabc.c
>> @@ -0,0 +1,310 @@
>> +/*
>> + * Copyright © 2006-2010 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.
>> + *
>> + * Author: Deepak M <m.deepak at intel.com> */
>> +
>> +#include <linux/kernel.h>
>> +#include <linux/moduleparam.h>
>> +#include "intel_drv.h"
>> +#include "intel_dsi.h"
>> +#include "i915_drv.h"
>> +#include "intel_dsi_cabc.h"
>> +#include <video/mipi_display.h>
>> +#include <drm/drm_mipi_dsi.h>
>> +
>> +static inline enum port get_cabc_port(struct intel_dsi *intel_dsi) {
>> + if (intel_dsi->dl_cabc_port == CABC_PORT_C)
>> + return PORT_C;
>> + else
>> + return PORT_A;
>> +}
>> +
>> +int cabc_setup_backlight(struct drm_connector *connector,
>> + enum pipe unused)
>> +{
>> + struct drm_device *dev = connector->dev;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> + struct intel_connector *intel_connector =
>to_intel_connector(connector);
>> + struct intel_panel *panel = &intel_connector->panel;
>> +
>> + if (dev_priv->vbt.backlight.present)
>> + panel->backlight.present = true;
>> + else {
>> + DRM_ERROR("no backlight present per VBT\n");
>> + return 0;
>> + }
>> +
>> + panel->backlight.max = CABC_MAX_VALUE;
>> + panel->backlight.level = CABC_MAX_VALUE;
>> +
>> + return 0;
>> +}
>> +
>> +u32 cabc_get_backlight(struct intel_connector *connector) {
>> + struct drm_device *dev = connector->base.dev;
>> + struct intel_dsi *intel_dsi = NULL;
>> + struct drm_crtc *crtc = NULL;
>> + struct intel_encoder *encoder = NULL;
>> + struct mipi_dsi_device *dsi_device;
>> + u8 data[2] = {0};
>> + enum port port;
>> + u32 ret;
>> +
>> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>> + for_each_encoder_on_crtc(dev, crtc, encoder) {
>> + if (encoder->type == INTEL_OUTPUT_DSI) {
>> + intel_dsi = enc_to_intel_dsi(&encoder-
>>base);
>> + break;
>> + }
>> + }
>> + if (intel_dsi != NULL)
>> + break;
>> + }
>
>You can get at intel_dsi via connector->encoder. No need for this kind of
>loops.
>
[Deepak M] Okay
>Same for similar loops below.
>
>> +
>> + for_each_dsi_port(port, intel_dsi->ports) {
>> + if (intel_dsi->dual_link)
>> + port = get_cabc_port(intel_dsi);
>> +
>> + dsi_device = intel_dsi->dsi_hosts[port]->device;
>> + mipi_dsi_dcs_read(dsi_device, MIPI_DCS_CABC_LEVEL_RD,
>data, 2);
>> +
>> + if (intel_dsi->dual_link &&
>> + !(intel_dsi->dl_cabc_port ==
>CABC_PORT_A_AND_C))
>> + break;
>> + }
>
>That is a really confusing way to do the dcs command on one or more ports.
>How about making dl_cabc_port (hopefully renamed to something referring
>to dcs rather than cabc) a bitmap of ports similar to intel_dsi->ports, so you
>can make this loop simply:
>
> for_each_dsi_port(port, dcs_backlight_ports)
> ...
>
>There'd be no need for special casing and conditional breaks out of the loop or
>anything.
>
>Same for similar loops below.
>
[Deepak M] Nice, will try to implement this way
>> +
>> + ret = data[1];
>> +
>> + return ret;
>> +}
>> +
>> +void cabc_set_backlight(struct intel_connector *connector, u32 level)
>> +{
>> + struct drm_device *dev = connector->base.dev;
>> + struct intel_dsi *intel_dsi = NULL;
>> + struct drm_crtc *crtc = NULL;
>> + struct intel_encoder *encoder = NULL;
>> + struct mipi_dsi_device *dsi_device;
>> + u8 data[2] = {0};
>> + enum port port;
>> +
>> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>> + for_each_encoder_on_crtc(dev, crtc, encoder) {
>> + if (encoder->type == INTEL_OUTPUT_DSI) {
>> + intel_dsi = enc_to_intel_dsi(&encoder-
>>base);
>> + break;
>> + }
>> + }
>> + if (intel_dsi != NULL)
>> + break;
>> + }
>> +
>> + for_each_dsi_port(port, intel_dsi->ports) {
>> + if (intel_dsi->dual_link)
>> + port = get_cabc_port(intel_dsi);
>> +
>> + dsi_device = intel_dsi->dsi_hosts[port]->device;
>> + data[1] = level;
>> + data[0] = MIPI_DCS_CABC_LEVEL_WR;
>> + mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
>> +
>> + if (intel_dsi->dual_link &&
>> + !(intel_dsi->dl_cabc_port == CABC_PORT_A_AND_C))
>> + break;
>> + }
>> +}
>> +
>> +void cabc_enable_backlight(struct intel_connector *connector) {
>> + struct drm_device *dev = connector->base.dev;
>> + struct intel_dsi *intel_dsi = NULL;
>> + struct drm_crtc *crtc = NULL;
>> + struct intel_encoder *encoder = NULL;
>> + struct intel_panel *panel = &connector->panel;
>> + struct mipi_dsi_device *dsi_device;
>> + enum port port;
>> + u8 data[2] = {0};
>> +
>> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>> + for_each_encoder_on_crtc(dev, crtc, encoder) {
>> + if (encoder->type == INTEL_OUTPUT_DSI) {
>> + intel_dsi = enc_to_intel_dsi(&encoder-
>>base);
>> + break;
>> + }
>> + }
>> + if (intel_dsi != NULL)
>> + break;
>> + }
>> +
>> + for_each_dsi_port(port, intel_dsi->ports) {
>> + if (intel_dsi->dual_link)
>> + port = get_cabc_port(intel_dsi);
>> +
>> + dsi_device = intel_dsi->dsi_hosts[port]->device;
>> + data[0] = MIPI_DCS_CABC_CONTROL_BRIGHT_WR;
>> + data[1] = CABC_BACKLIGHT | CABC_DIMMING_DISPLAY |
>CABC_BCTRL;
>> + mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
>> + data[0] = MIPI_DCS_CABC_CONTROL_WR;
>> + data[1] = CABC_STILL_PICTURE;
>> + mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
>> +
>> + if (intel_dsi->dual_link &&
>> + !(intel_dsi->dl_cabc_port ==
>CABC_PORT_A_AND_C))
>> + break;
>> + }
>> +
>> + cabc_set_backlight(connector, panel->backlight.level); }
>> +
>> +void cabc_disable_backlight(struct intel_connector *connector) {
>> + struct drm_device *dev = connector->base.dev;
>> + struct intel_dsi *intel_dsi = NULL;
>> + struct drm_crtc *crtc = NULL;
>> + struct intel_encoder *encoder = NULL;
>> + struct mipi_dsi_device *dsi_device;
>> + enum port port;
>> + u8 data[2] = {0};
>> +
>> + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
>> + for_each_encoder_on_crtc(dev, crtc, encoder) {
>> + if (encoder->type == INTEL_OUTPUT_DSI) {
>> + intel_dsi = enc_to_intel_dsi(&encoder-
>>base);
>> + break;
>> + }
>> + }
>> + if (intel_dsi != NULL)
>> + break;
>> + }
>> +
>> + cabc_set_backlight(connector, 0);
>> +
>> + for_each_dsi_port(port, intel_dsi->ports) {
>> + if (intel_dsi->dual_link)
>> + port = get_cabc_port(intel_dsi);
>> + dsi_device = intel_dsi->dsi_hosts[port]->device;
>> +
>> + data[1] = CABC_OFF;
>> + data[0] = MIPI_DCS_CABC_CONTROL_WR;
>> + mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
>> + data[0] = MIPI_DCS_CABC_CONTROL_BRIGHT_WR;
>> + mipi_dsi_dcs_write_buffer(dsi_device, data, 2);
>> +
>> + if (intel_dsi->dual_link &&
>> + !(intel_dsi->dl_cabc_port ==
>CABC_PORT_A_AND_C))
>> + break;
>> + }
>> +}
>> +static int cabc_backlight_device_update_status(struct
>> +backlight_device *bd) {
>> + struct intel_connector *connector = bl_get_data(bd);
>> + struct drm_device *dev = connector->base.dev;
>> +
>> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
>> + DRM_DEBUG_KMS("updating intel_backlight, brightness=%d/%d\n",
>> + bd->props.brightness, bd->props.max_brightness);
>> +
>> + cabc_set_backlight(connector, bd->props.brightness);
>> +
>> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
>> +
>> + return 0;
>> +}
>> +
>> +static int cabc_backlight_device_get_brightness(struct
>> +backlight_device *bd) {
>> + struct intel_connector *connector = bl_get_data(bd);
>> + struct drm_device *dev = connector->base.dev;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>> + int ret;
>> +
>> + intel_runtime_pm_get(dev_priv);
>> + drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
>> +
>> + ret = cabc_get_backlight(connector);
>> +
>> + drm_modeset_unlock(&dev->mode_config.connection_mutex);
>> + intel_runtime_pm_put(dev_priv);
>> +
>> + return ret;
>> +}
>> +
>> +static const struct backlight_ops cabc_backlight_device_ops = {
>> + .update_status = cabc_backlight_device_update_status,
>> + .get_brightness = cabc_backlight_device_get_brightness,
>> +};
>> +
>> +int cabc_backlight_device_register(struct intel_connector *connector)
>> +{
>> + struct intel_panel *panel = &connector->panel;
>> + struct backlight_properties props;
>> +
>> + if (WARN_ON(panel->backlight.device))
>> + return -ENODEV;
>> +
>> + if (!panel->backlight.present) {
>> + DRM_ERROR("No backlight present\n");
>> + return 0;
>> + }
>> +
>> + WARN_ON(panel->backlight.max == 0);
>> +
>> + memset(&props, 0, sizeof(props));
>> + props.type = BACKLIGHT_FIRMWARE;
>> + props.max_brightness = panel->backlight.max;
>> + props.brightness = props.max_brightness;
>> +
>> + /*
>> + * Note: using the same name independent of the connector prevents
>> + * registration of multiple backlight devices in the driver.
>> + */
>> + panel->backlight.device =
>> + backlight_device_register("intel_backlight",
>> + connector->base.kdev,
>> + connector,
>> + &cabc_backlight_device_ops, &props);
>> +
>> + if (IS_ERR(panel->backlight.device)) {
>> + DRM_ERROR("Failed to register backlight: %ld\n",
>> + PTR_ERR(panel->backlight.device));
>> + panel->backlight.device = NULL;
>> + return -ENODEV;
>> + }
>> +
>> + DRM_DEBUG_KMS("Connector %s backlight sysfs interface
>registered\n",
>> + connector->base.name);
>> +
>> + return 0;
>> +}
>> +
>> +void cabc_backlight_device_unregister(struct intel_connector
>> +*connector) {
>> + struct intel_panel *panel = &connector->panel;
>> +
>> + if (panel->backlight.device) {
>> + backlight_device_unregister(panel->backlight.device);
>> + panel->backlight.device = NULL;
>> + }
>> +}
>> diff --git a/drivers/gpu/drm/i915/intel_dsi_cabc.h
>> b/drivers/gpu/drm/i915/intel_dsi_cabc.h
>> new file mode 100644
>> index 0000000..b1a79d9
>> --- /dev/null
>> +++ b/drivers/gpu/drm/i915/intel_dsi_cabc.h
>> @@ -0,0 +1,46 @@
>> +/*
>> + * Copyright © 2013 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.
>> + *
>> + * Author: Deepak M <m.deepak at intel.com> */
>> +
>> +extern int cabc_backlight_device_register(struct intel_connector
>> +*connector); extern void cabc_backlight_device_unregister(struct
>> +intel_connector *connector); void cabc_set_backlight(struct
>> +intel_connector *connector, u32 level);
>> +u32 cabc_get_backlight(struct intel_connector *connector); void
>> +cabc_enable_backlight(struct intel_connector *connector); void
>> +cabc_disable_backlight(struct intel_connector *connector); int
>> +cabc_setup_backlight(struct drm_connector *connector, enum pipe
>> +unused);
>> +
>> +#define CABC_OFF (0 << 0)
>> +#define CABC_USER_INTERFACE_IMAGE (1 << 0)
>> +#define CABC_STILL_PICTURE (2 << 0)
>> +#define CABC_VIDEO_MODE (3 << 0)
>> +
>> +#define CABC_BACKLIGHT (1 << 2)
>> +#define CABC_DIMMING_DISPLAY (1 << 3)
>> +#define CABC_BCTRL (1 << 5)
>> +
>> +#define CABC_PORT_A 0x00
>> +#define CABC_PORT_C 0x01
>> +#define CABC_PORT_A_AND_C 0x02
>> +#define CABC_MAX_VALUE 0xff
>> diff --git a/drivers/gpu/drm/i915/intel_panel.c
>> b/drivers/gpu/drm/i915/intel_panel.c
>> index e2ab3f6..ff2e586 100644
>> --- a/drivers/gpu/drm/i915/intel_panel.c
>> +++ b/drivers/gpu/drm/i915/intel_panel.c
>> @@ -34,6 +34,7 @@
>> #include <linux/moduleparam.h>
>> #include <linux/pwm.h>
>> #include "intel_drv.h"
>> +#include "intel_dsi_cabc.h"
>>
>> #define CRC_PMIC_PWM_PERIOD_NS 21333
>>
>> @@ -1586,15 +1587,29 @@ void intel_panel_fini(struct intel_panel
>> *panel) void intel_backlight_register(struct drm_device *dev) {
>> struct intel_connector *connector;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>>
>> - list_for_each_entry(connector, &dev->mode_config.connector_list,
>base.head)
>> - intel_backlight_device_register(connector);
>> + list_for_each_entry(connector, &dev->mode_config.connector_list,
>> + base.head) {
>> + if (connector->encoder->type == INTEL_OUTPUT_DSI &&
>> + dev_priv->vbt.dsi.config->cabc_supported)
>> + cabc_backlight_device_register(connector);
>> + else
>> + intel_backlight_device_register(connector);
>> + }
>> }
>>
>> void intel_backlight_unregister(struct drm_device *dev) {
>> struct intel_connector *connector;
>> + struct drm_i915_private *dev_priv = dev->dev_private;
>>
>> - list_for_each_entry(connector, &dev->mode_config.connector_list,
>base.head)
>> - intel_backlight_device_unregister(connector);
>> + list_for_each_entry(connector, &dev->mode_config.connector_list,
>> + base.head) {
>> + if (connector->encoder->type == INTEL_OUTPUT_DSI &&
>> + dev_priv->vbt.dsi.config->cabc_supported)
>> + cabc_backlight_device_unregister(connector);
>> + else
>> + intel_backlight_device_unregister(connector);
>> + }
>> }
>> diff --git a/include/video/mipi_display.h
>> b/include/video/mipi_display.h index ddcc8ca..5b8eeec 100644
>> --- a/include/video/mipi_display.h
>> +++ b/include/video/mipi_display.h
>> @@ -117,6 +117,14 @@ enum {
>> MIPI_DCS_GET_SCANLINE = 0x45,
>> MIPI_DCS_READ_DDB_START = 0xA1,
>> MIPI_DCS_READ_DDB_CONTINUE = 0xA8,
>> + MIPI_DCS_CABC_LEVEL_RD = 0x52,
>> + MIPI_DCS_CABC_MIN_BRIGHTNESS_RD = 0x5F,
>> + MIPI_DCS_CABC_CONTROL_RD = 0x56,
>> + MIPI_DCS_CABC_CONTROL_BRIGHT_RD = 0x54,
>> + MIPI_DCS_CABC_LEVEL_WR = 0x51,
>> + MIPI_DCS_CABC_MIN_BRIGHTNESS_WR = 0x5E,
>> + MIPI_DCS_CABC_CONTROL_WR = 0x55,
>> + MIPI_DCS_CABC_CONTROL_BRIGHT_WR = 0x53,
>
>These changes need to be a separate patch. And what's the spec reference, I
>can't find these.
>
[Deepak M] The HLD can be found in the link https://securewiki.ith.intel.com/display/GfxDisplay/MIPI+Display (it is under Intel firewall)
>BR,
>Jani.
>
>
>> };
>>
>> /* MIPI DCS pixel formats */
>> --
>> 1.7.9.5
>>
>> _______________________________________________
>> Intel-gfx mailing list
>> Intel-gfx at lists.freedesktop.org
>> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
>--
>Jani Nikula, Intel Open Source Technology Center
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