On Tue, 22 Mar 2016, Deepak M <m.deepak@xxxxxxxxx> 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.
>
> v2: Moving the CABC bkl functions to new file.(Jani)
>
> v3: Rebase
>
> v4: Rebase
>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
> Cc: Yetunde Adebisi <yetundex.adebisi@xxxxxxxxx>
> Signed-off-by: Deepak M <m.deepak@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/Makefile | 1 +
> drivers/gpu/drm/i915/i915_drv.h | 2 +-
> drivers/gpu/drm/i915/intel_dsi.c | 19 +++-
> drivers/gpu/drm/i915/intel_dsi.h | 4 +
> drivers/gpu/drm/i915/intel_dsi_cabc.c | 179 ++++++++++++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_panel.c | 4 +
> 6 files changed, 206 insertions(+), 3 deletions(-)
> create mode 100644 drivers/gpu/drm/i915/intel_dsi_cabc.c
>
> diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
> index 7ffb51b..065c410 100644
> --- a/drivers/gpu/drm/i915/Makefile
> +++ b/drivers/gpu/drm/i915/Makefile
> @@ -83,6 +83,7 @@ i915-y += dvo_ch7017.o \
> intel_dp_mst.o \
> intel_dp.o \
> intel_dsi.o \
> + intel_dsi_cabc.o \
> intel_dsi_panel_vbt.o \
> intel_dsi_pll.o \
> intel_dvo.o \
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 050d860..d196404 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -3489,7 +3489,7 @@ void intel_sbi_write(struct drm_i915_private *dev_priv, u16 reg, u32 value,
> enum intel_sbi_destination destination);
> u32 vlv_flisdsi_read(struct drm_i915_private *dev_priv, u32 reg);
> void vlv_flisdsi_write(struct drm_i915_private *dev_priv, u32 reg, u32 val);
> -
> +int intel_dsi_cabc_init_backlight_funcs(struct intel_connector *intel_connector);
This probably fits better in intel_drv.h under a /* intel_dsi_cabc.c */
comment, see the file for examples.
> int intel_gpu_freq(struct drm_i915_private *dev_priv, int val);
> int intel_freq_opcode(struct drm_i915_private *dev_priv, int val);
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 456676c..7aa707f 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -1209,10 +1209,25 @@ void intel_dsi_init(struct drm_device *dev)
> else
> intel_encoder->crtc_mask = BIT(PIPE_B);
>
> - if (dev_priv->vbt.dsi.config->dual_link)
> + if (dev_priv->vbt.dsi.config->dual_link) {
> intel_dsi->ports = BIT(PORT_A) | BIT(PORT_C);
> - else
> + switch (dev_priv->vbt.dsi.config->dl_cabc_port) {
> + case CABC_PORT_A:
> + intel_dsi->bkl_dcs_ports = BIT(PORT_A);
> + break;
> + case CABC_PORT_C:
> + intel_dsi->bkl_dcs_ports = BIT(PORT_C);
> + break;
> + case CABC_PORT_A_AND_C:
> + intel_dsi->bkl_dcs_ports = BIT(PORT_A) | BIT(PORT_C);
> + break;
> + default:
> + DRM_ERROR("Unknown MIPI ports for sending DCS\n");
> + }
> + } else {
> intel_dsi->ports = BIT(port);
> + intel_dsi->bkl_dcs_ports = BIT(port);
> + }
>
> /* Create a DSI host (and a device) for each port. */
> for_each_dsi_port(port, intel_dsi->ports) {
> diff --git a/drivers/gpu/drm/i915/intel_dsi.h b/drivers/gpu/drm/i915/intel_dsi.h
> index 0e758f1..5c07d59 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.h
> +++ b/drivers/gpu/drm/i915/intel_dsi.h
> @@ -34,6 +34,10 @@
> #define DSI_DUAL_LINK_FRONT_BACK 1
> #define DSI_DUAL_LINK_PIXEL_ALT 2
>
> +#define CABC_PORT_A 0x00
> +#define CABC_PORT_C 0x01
> +#define CABC_PORT_A_AND_C 0x02
> +
> struct intel_dsi_host;
>
> struct intel_dsi {
> 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..d14a669
> --- /dev/null
> +++ b/drivers/gpu/drm/i915/intel_dsi_cabc.c
> @@ -0,0 +1,179 @@
> +/*
> + * Copyright © 2006-2010 Intel Corporation
2016
> + *
> + * 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 "intel_drv.h"
> +#include "intel_dsi.h"
> +#include "i915_drv.h"
> +#include <drm/drm_mipi_dsi.h>
> +
> +#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_MAX_VALUE 0xFF
> +
The defines below should be added to the relevant enum in
include/video/mipi_display.h using the MIPI DCS specification
names. I'll copy them below. Please create a separate prep patch and
send it to dri-devel.
> +#define MIPI_DCS_CABC_LEVEL_RD 0x52
MIPI_DCS_GET_DISPLAY_BRIGHTNESS
> +#define MIPI_DCS_CABC_MIN_BRIGHTNESS_RD 0x5F
MIPI_DCS_GET_CABC_MIN_BRIGHTNESS
> +#define MIPI_DCS_CABC_CONTROL_RD 0x56
MIPI_DCS_GET_POWER_SAVE
> +#define MIPI_DCS_CABC_CONTROL_BRIGHT_RD 0x54
MIPI_DCS_GET_CONTROL_DISPLAY
> +#define MIPI_DCS_CABC_LEVEL_WR 0x51
MIPI_DCS_SET_DISPLAY_BRIGHTNESS
> +#define MIPI_DCS_CABC_MIN_BRIGHTNESS_WR 0x5E
MIPI_DCS_SET_CABC_MIN_BRIGHTNESS
> +#define MIPI_DCS_CABC_CONTROL_WR 0x55
MIPI_DCS_WRITE_POWER_SAVE
> +#define MIPI_DCS_CABC_CONTROL_BRIGHT_WR 0x53
MIPI_DCS_WRITE_CONTROL_DISPLAY
> +
> +static u32 cabc_get_backlight(struct intel_connector *connector)
> +{
struct intel_encoder *encoder = connector->encoder;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
Same for all functions below.
> + struct intel_dsi *intel_dsi = NULL;
> + struct intel_encoder *encoder = NULL;
> + struct mipi_dsi_device *dsi_device;
> + u8 data[2] = {0};
> + enum port port;
> +
> + encoder = connector->encoder;
> + intel_dsi = enc_to_intel_dsi(&encoder->base);
> +
> + for_each_dsi_port(port, intel_dsi->bkl_dcs_ports) {
> + dsi_device = intel_dsi->dsi_hosts[port]->device;
> + mipi_dsi_dcs_read(dsi_device, MIPI_DCS_CABC_LEVEL_RD, data, 2);
> + }
> +
> + return data[1];
Hmm, it's up to the manufacturer whether the this is 8 or 16 bits. I
guess you're just assuming 8 bits? I wonder if this should be more
generic wrt 8 vs. 16 bits.
> +}
> +
> +static void cabc_set_backlight(struct intel_connector *connector, u32 level)
> +{
> + struct intel_dsi *intel_dsi = NULL;
> + struct intel_encoder *encoder = NULL;
> + struct mipi_dsi_device *dsi_device;
> + u8 data[2] = {0};
> + enum port port;
> +
> + encoder = connector->encoder;
> + intel_dsi = enc_to_intel_dsi(&encoder->base);
> +
> + for_each_dsi_port(port, intel_dsi->bkl_dcs_ports) {
> + 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);
Please use mipi_dsi_dcs_write(). Same for all functions below.
> + }
> +}
> +
> +static void cabc_disable_backlight(struct intel_connector *connector)
> +{
> + struct intel_dsi *intel_dsi = NULL;
> + struct intel_encoder *encoder = NULL;
> + struct mipi_dsi_device *dsi_device;
> + enum port port;
> + u8 data[2] = {0};
> +
> + encoder = connector->encoder;
> + intel_dsi = enc_to_intel_dsi(&encoder->base);
> +
> + cabc_set_backlight(connector, 0);
> +
> + for_each_dsi_port(port, intel_dsi->bkl_dcs_ports) {
> + 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);
> + }
> +}
> +
> +static void cabc_enable_backlight(struct intel_connector *connector)
> +{
> + struct intel_dsi *intel_dsi = 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};
> +
> + encoder = connector->encoder;
> + intel_dsi = enc_to_intel_dsi(&encoder->base);
> +
> + for_each_dsi_port(port, intel_dsi->bkl_dcs_ports) {
> + 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);
> + }
> +
> + cabc_set_backlight(connector, panel->backlight.level);
> +}
> +
> +static int cabc_setup_backlight(struct intel_connector *connector,
> + enum pipe unused)
> +{
> + struct drm_device *dev = connector->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_panel *panel = &connector->panel;
> +
> + if (dev_priv->vbt.backlight.present)
> + panel->backlight.present = true;
> + else {
> + DRM_ERROR("no backlight present per VBT\n");
> + return 0;
> + }
None of the above is needed.
dev_priv->vbt.backlight.present is checked higher level in
intel_panel_setup_backlight(), and panel->backlight.present = true is
set there as well if this hook returns 0.
> +
> + panel->backlight.max = CABC_MAX_VALUE;
> + panel->backlight.level = CABC_MAX_VALUE;
> +
> + return 0;
> +}
> +
> +int intel_dsi_cabc_init_backlight_funcs(struct intel_connector *intel_connector)
> +{
> + struct drm_device *dev = intel_connector->base.dev;
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + struct intel_encoder *encoder = intel_connector->encoder;
> + struct intel_panel *panel = &intel_connector->panel;
> +
> + if (!dev_priv->vbt.dsi.config->cabc_supported)
> + return -EINVAL;
-ENODEV seems more appropriate.
> +
> + if (encoder->type != INTEL_OUTPUT_DSI) {
> + DRM_ERROR("Use DSI encoder for CABC\n");
> + return -EINVAL;
> + }
if (WARN_ON(encoder->type != INTEL_OUTPUT_DSI))
return -EINVAL;
> +
> + panel->backlight.setup = cabc_setup_backlight;
> + panel->backlight.enable = cabc_enable_backlight;
> + panel->backlight.disable = cabc_disable_backlight;
> + panel->backlight.set = cabc_set_backlight;
> + panel->backlight.get = cabc_get_backlight;
> +
> + return 0;
> +}
> diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> index 8c8996f..0f9bf80 100644
> --- a/drivers/gpu/drm/i915/intel_panel.c
> +++ b/drivers/gpu/drm/i915/intel_panel.c
> @@ -1718,6 +1718,10 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
> container_of(panel, struct intel_connector, panel);
> struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
>
> + if (connector->base.connector_type == DRM_MODE_CONNECTOR_DSI &&
> + intel_dsi_cabc_init_backlight_funcs(connector) == 0)
Indentation is not quite right.
> + return;
> +
> if (IS_BROXTON(dev_priv)) {
> panel->backlight.setup = bxt_setup_backlight;
> panel->backlight.enable = bxt_enable_backlight;
--
Jani Nikula, Intel Open Source Technology Center
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