linux-kernel - [RFC PATCH 0/3] Init flow fixes for Samsung DSIM and TI SN65DSI84

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Message-Id: <20230418102947.876621-1-frieder@fris.de>
Date:   Tue, 18 Apr 2023 12:29:36 +0200
From:   Frieder Schrempf <frieder@...s.de>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        David Airlie <airlied@...il.com>,
        dri-devel@...ts.freedesktop.org, Inki Dae <inki.dae@...sung.com>,
        Jagan Teki <jagan@...rulasolutions.com>,
        linux-kernel@...r.kernel.org,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Robert Foss <rfoss@...nel.org>
Cc:     Frieder Schrempf <frieder.schrempf@...tron.de>,
        Alexander Stein <alexander.stein@...tq-group.com>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Jonas Karlman <jonas@...boo.se>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Marek Vasut <marex@...x.de>, Sam Ravnborg <sam@...nborg.org>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>
Subject: [RFC PATCH 0/3] Init flow fixes for Samsung DSIM and TI SN65DSI84

From: Frieder Schrempf <frieder.schrempf@...tron.de>

This patchset contains a proposal to fix the initialization flow for
the display pipeline used on our i.MX8MM Kontron boards:

  i.MX8MM LCDIF -> i.MX8MM DSIM -> TI SN65DSI84 -> 7" LVDS Panel

Without these changes the display works most of the time, but fails
to come up occassionally when booting or doing on/off cycling tests
with:

  echo 0 > /sys/devices/platform/soc@...2c00000.bus/32e00000.lcdif/graphics/fb0/blank
  echo 1 > /sys/devices/platform/soc@...2c00000.bus/32e00000.lcdif/graphics/fb0/blank

I also added a bit of a speculative patch 3/3 for cleaning up the
Exynos init flow, which is the main reason this is sent as RFC as
I have no idea if this is correct/working at all.

Frieder Schrempf (3):
  drm: bridge: samsung-dsim: Fix i.MX8M enable flow to meet spec
  drm/bridge: ti-sn65dsi83: Fix enable/disable flow to meet spec
  drm: bridge: samsung-dsim: Remove init quirk for Exynos

 drivers/gpu/drm/bridge/samsung-dsim.c | 34 +++++++++++++++------------
 drivers/gpu/drm/bridge/ti-sn65dsi83.c | 19 ++++++++++++---
 2 files changed, 35 insertions(+), 18 deletions(-)

-- 
2.40.0