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

From: Leonard Crestez <leonard.crestez@nxp.com>
To: Stefan Agner <stefan@agner.ch>,
	Philipp Zabel <p.zabel@pengutronix.de>,
	Marek Vasut <marex@denx.de>
Cc: Shawn Guo <shawnguo@kernel.org>,
	Fabio Estevam <fabio.estevam@nxp.com>,
	Robert Chiras <robert.chiras@nxp.com>,
	Mirela Rabulea <mirela.rabulea@nxp.com>,
	Anson Huang <Anson.Huang@nxp.com>,
	dri-devel@lists.freedesktop.org,
	Dong Aisheng <aisheng.dong@nxp.com>,
	linux-imx@nxp.com, kernel@pengutronix.de,
	linux-kernel@vger.kernel.org
Subject: [PATCH v3 0/4] drm/mxsfb: Fix runtime PM for unpowering lcdif block
Date: Mon,  6 Aug 2018 22:31:06 +0300	[thread overview]
Message-ID: <cover.1533583611.git.leonard.crestez@nxp.com> (raw)

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