From: Michael Walle <mwalle@kernel.org>
To: Andrzej Hajda <andrzej.hajda@intel.com>,
Neil Armstrong <neil.armstrong@linaro.org>,
Robert Foss <rfoss@kernel.org>,
Laurent Pinchart <Laurent.pinchart@ideasonboard.com>,
Jonas Karlman <jonas@kwiboo.se>,
Jernej Skrabec <jernej.skrabec@gmail.com>,
Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
David Airlie <airlied@gmail.com>,
Daniel Vetter <daniel@ffwll.ch>,
Chun-Kuang Hu <chunkuang.hu@kernel.org>,
Philipp Zabel <p.zabel@pengutronix.de>,
Matthias Brugger <matthias.bgg@gmail.com>,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@collabora.com>,
Sam Ravnborg <sam@ravnborg.org>,
Vinay Simha BN <simhavcs@gmail.com>,
Tony Lindgren <tony@atomide.com>
Cc: Daniel Semkowicz <dse@thaumatec.com>,
dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
linux-mediatek@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
Michael Walle <mwalle@kernel.org>
Subject: [PATCH 00/20] drm/bridge: tc358775: proper bridge bringup and code cleanup
Date: Mon, 06 May 2024 15:34:29 +0200 [thread overview]
Message-ID: <20240506-tc358775-fix-powerup-v1-0-545dcf00b8dd@kernel.org> (raw)
This patchset fixes the bridge initialization according to the
datasheet. Not sure how that even worked before. Maybe because the
initialization was done prior to linux (?).
The bridge has some peculiarities:
(1) The reset has to be deasserted in LP-11 mode
(2) For I2C access the bridge needs the DSI clock
(3) The bridge has to be configured while the video stream is
disabled.
(4) The bridge has limitations on the display timings. In particular,
the horizontal pulse width has to be at least 8 pixels wide and
both the horizontal pulse width as well as the back porch has to
be even. According to the datasheet the horizontal front porch as
well but in line sync mode, this is ignored. Also line sync is the
only supported mode for this bridge, therefore, the front porch
is always ignored.
The most controversial patch is probably "drm/bridge: add
dsi_lp11_notify mechanism" which is needed for (1) above. Some time ago
there was a series [1] to add a manual power-up, which was abandoned and
which didn't suite the needs for this bridge anyway.
Also, this will gradually change the tc_ prefix to tc358775_ while the
functions are refactored.
The bridge was successfully tested on a Mediatek MT8195 SoC with the
following panels:
- Innolux G101ICE
- AUO G121EAN01.0
- Innolux G156HCE (dual-link LVDS)
[1] https://lore.kernel.org/r/20231016165355.1327217-1-dmitry.baryshkov@linaro.org/
Signed-off-by: Michael Walle <mwalle@kernel.org>
---
Michael Walle (20):
drm/bridge: add dsi_lp11_notify mechanism
drm/mediatek: dsi: provide LP-11 mode during .pre_enable
drm/mediatek: dsi: add support for .dsi_lp11_notity()
drm/bridge: tc358775: fix regulator supply id
drm/bridge: tc358775: add crtc modes fixup
drm/bridge: tc358775: redefine LV_MX()
drm/bridge: tc358775: use regmap instead of open coded access functions
drm/bridge: tc358775: remove error message if regulator is missing
drm/bridge: tc358775: remove complex vsdelay calculation
drm/bridge: tc358775: simplify lvds_link property
drm/bridge: tc358775: reformat weird indentation
drm/bridge: tc358775: correctly configure LVDS clock
drm/bridge: tc358775: split the init code
drm/bridge: tc358775: configure PLL depending on the LVDS clock
drm/bridge: tc358775: dynamically configure DSI link settings
drm/bridge: tc358775: use proper defines to configure LVDS timings
drm/bridge: tc358775: move bridge power up/down into functions
drm/bridge: tc358775: fix the power-up/down delays
drm/bridge: tc358775: fix power-up sequencing
drm/bridge: tc358775: use devm_drm_bridge_add()
drivers/gpu/drm/bridge/Kconfig | 1 +
drivers/gpu/drm/bridge/tc358775.c | 601 ++++++++++++++++++++-----------------
drivers/gpu/drm/drm_bridge.c | 16 +
drivers/gpu/drm/mediatek/mtk_dsi.c | 8 +-
include/drm/drm_bridge.h | 12 +
5 files changed, 355 insertions(+), 283 deletions(-)
---
base-commit: 9221b2819b8a4196eecf5476d66201be60fbcf29
change-id: 20240506-tc358775-fix-powerup-53f490043179
next reply other threads:[~2024-05-06 13:35 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-06 13:34 Michael Walle [this message]
2024-05-06 13:34 ` [PATCH 01/20] drm/bridge: add dsi_lp11_notify mechanism Michael Walle
2024-05-07 8:37 ` Alexander Stein
2024-05-07 13:39 ` Dmitry Baryshkov
2024-05-06 13:34 ` [PATCH 02/20] drm/mediatek: dsi: provide LP-11 mode during .pre_enable Michael Walle
2024-05-06 13:34 ` [PATCH 03/20] drm/mediatek: dsi: add support for .dsi_lp11_notity() Michael Walle
2024-05-06 13:34 ` [PATCH 04/20] drm/bridge: tc358775: fix regulator supply id Michael Walle
2024-05-06 13:34 ` [PATCH 05/20] drm/bridge: tc358775: add crtc modes fixup Michael Walle
2024-05-06 13:34 ` [PATCH 06/20] drm/bridge: tc358775: redefine LV_MX() Michael Walle
2024-05-06 13:34 ` [PATCH 07/20] drm/bridge: tc358775: use regmap instead of open coded access functions Michael Walle
2024-05-06 13:34 ` [PATCH 08/20] drm/bridge: tc358775: remove error message if regulator is missing Michael Walle
2024-05-06 13:34 ` [PATCH 09/20] drm/bridge: tc358775: remove complex vsdelay calculation Michael Walle
2024-05-06 13:34 ` [PATCH 10/20] drm/bridge: tc358775: simplify lvds_link property Michael Walle
2024-05-06 13:34 ` [PATCH 11/20] drm/bridge: tc358775: reformat weird indentation Michael Walle
2024-05-06 13:34 ` [PATCH 12/20] drm/bridge: tc358775: correctly configure LVDS clock Michael Walle
2024-05-06 13:34 ` [PATCH 13/20] drm/bridge: tc358775: split the init code Michael Walle
2024-05-06 13:34 ` [PATCH 14/20] drm/bridge: tc358775: configure PLL depending on the LVDS clock Michael Walle
2024-05-06 13:34 ` [PATCH 15/20] drm/bridge: tc358775: dynamically configure DSI link settings Michael Walle
2024-05-06 13:34 ` [PATCH 16/20] drm/bridge: tc358775: use proper defines to configure LVDS timings Michael Walle
2024-05-06 13:34 ` [PATCH 17/20] drm/bridge: tc358775: move bridge power up/down into functions Michael Walle
2024-05-06 13:34 ` [PATCH 18/20] drm/bridge: tc358775: fix the power-up/down delays Michael Walle
2024-05-06 13:34 ` [PATCH 19/20] drm/bridge: tc358775: fix power-up sequencing Michael Walle
2024-05-06 13:34 ` [PATCH 20/20] drm/bridge: tc358775: use devm_drm_bridge_add() Michael Walle
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