From: Rajeev Nandan <rajeevny@codeaurora.org>
To: dri-devel@lists.freedesktop.org, linux-arm-msm@vger.kernel.org,
freedreno@lists.freedesktop.org, devicetree@vger.kernel.org
Cc: Rajeev Nandan <rajeevny@codeaurora.org>,
linux-kernel@vger.kernel.org, robdclark@gmail.com,
dianders@chromium.org, mkrishn@codeaurora.org,
kalyan_t@codeaurora.org, hoegsberg@chromium.org,
abhinavk@codeaurora.org, seanpaul@chromium.org
Subject: [v1 0/3] drm: Add support for backlight control of eDP panel on ti-sn65dsi86 bridge
Date: Wed, 14 Apr 2021 22:09:47 +0530 [thread overview]
Message-ID: <1618418390-15055-1-git-send-email-rajeevny@codeaurora.org> (raw)
The backlight level of an eDP panel can be controlled through the AUX
channel using DPCD registers of the panel.
The capability for the Source device to adjust backlight characteristics
within the panel, using the Sink device DPCD registers is indicated by
the TCON_BACKLIGHT_ADJUSTMENT_CAPABLE bit in the EDP_GENERAL_CAPABILITY_1
register (DPCD Address 701h, bit0). In this configuration, the eDP TCON
receives the backlight level information from the host, through the AUX
channel.
The changes in this patch series do the following:
- Add drm_dp_aux_backlight_ APIs to support backlight control using DPCD
registers on the DisplayPort AUX channel.
The current version only supports backlight brightness control by the
EDP_BACKLIGHT_BRIGHTNESS_MSB/LSB registers (DPCD Addresses 722h-723h).
- Add support for backlight control of the eDP panel connected to the
ti-sn65dsi86 bridge.
Rajeev Nandan (3):
drm/dp: Add DisplayPort aux backlight control support
dt-bindings: drm/bridge: ti-sn65dsi86: Document use-aux-backlight
drm/bridge: ti-sn65dsi86: Add DisplayPort aux backlight support
.../bindings/display/bridge/ti,sn65dsi86.yaml | 8 +
drivers/gpu/drm/Kconfig | 8 +
drivers/gpu/drm/Makefile | 1 +
drivers/gpu/drm/bridge/Kconfig | 1 +
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 26 +++
drivers/gpu/drm/drm_dp_aux_backlight.c | 191 +++++++++++++++++++++
include/drm/drm_dp_aux_backlight.h | 29 ++++
7 files changed, 264 insertions(+)
create mode 100644 drivers/gpu/drm/drm_dp_aux_backlight.c
create mode 100644 include/drm/drm_dp_aux_backlight.h
--
2.7.4
next reply other threads:[~2021-04-14 16:41 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-14 16:39 Rajeev Nandan [this message]
2021-04-14 16:39 ` [v1 1/3] drm/dp: Add DisplayPort aux backlight control support Rajeev Nandan
2021-04-14 16:39 ` [v1 2/3] dt-bindings: drm/bridge: ti-sn65dsi86: Document use-aux-backlight Rajeev Nandan
2021-04-15 22:04 ` Rob Herring
2021-04-14 16:39 ` [v1 3/3] drm/bridge: ti-sn65dsi86: Add DisplayPort aux backlight support Rajeev Nandan
2021-04-16 23:02 ` [v1 0/3] drm: Add support for backlight control of eDP panel on ti-sn65dsi86 bridge Doug Anderson
2021-04-20 8:14 ` Jani Nikula
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