linux-kernel - [PATCH v3 0/4] drm/mxsfb: Fix runtime PM for unpowering lcdif block

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Date:   Mon,  6 Aug 2018 22:31:06 +0300
From:   Leonard Crestez <leonard.crestez@....com>
To:     Stefan Agner <stefan@...er.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Marek Vasut <marex@...x.de>
Cc:     Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        Robert Chiras <robert.chiras@....com>,
        Mirela Rabulea <mirela.rabulea@....com>,
        Anson Huang <Anson.Huang@....com>,
        dri-devel@...ts.freedesktop.org,
        Dong Aisheng <aisheng.dong@....com>, linux-imx@....com,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: [PATCH v3 0/4] drm/mxsfb: Fix runtime PM for unpowering lcdif block

Adding lcdif nodes to a power domain currently does work, it results in
black/corrupted screens or hangs. While the driver does enable runtime
pm it does not deal correctly with the block being unpowered.

Changes since v2:
 * Split into multiple commits.
 * Use #ifdef CONFIG_PM_SLEEP.
 * Switch to drm_atomic_helper_commit_tail_rpm

Patch 1 was split because it's useful alone.

Patches 2/3 could maybe be squashed.

I'm not sure patch 4 handles vblanks correctly. It does not replace
patch 1 because there is still a small window between enabling the pipe
and the first atomic_update and also somebody needs to write to
NEXT_BUF.

Link to v2: https://lkml.org/lkml/2018/7/17/414

 drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 42 +++++++++++++++++++++---------
 drivers/gpu/drm/mxsfb/mxsfb_drv.c  | 40 ++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 13 deletions(-)

-- 
2.17.1