linux-kernel - Re: [RESEND 0/5] drm/mxsfb: Fix runtime PM for unpowering lcdif block

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Date:   Wed, 26 Sep 2018 04:13:29 -0400
From:   Sean Paul <sean@...rly.run>
To:     Leonard Crestez <leonard.crestez@....com>
Cc:     Daniel Vetter <daniel.vetter@...ll.ch>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Marek Vasut <marex@...x.de>, Stefan Agner <stefan@...er.ch>,
        Shawn Guo <shawnguo@...nel.org>,
        Fabio Estevam <fabio.estevam@....com>,
        David Airlie <airlied@...ux.ie>,
        Robert Chiras <robert.chiras@....com>,
        Anson Huang <Anson.Huang@....com>,
        dri-devel@...ts.freedesktop.org, linux-imx@....com,
        kernel@...gutronix.de, linux-kernel@...r.kernel.org
Subject: Re: [RESEND 0/5] drm/mxsfb: Fix runtime PM for unpowering lcdif block

On Mon, Sep 17, 2018 at 04:42:10PM +0300, Leonard Crestez wrote:
> Adding lcdif nodes to a power domain currently doesn't 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.
> 
> ---
> 
> All patches in this series have review tags from a while ago and I
> tested them again on top of next-20180913. No changes since last
> version: https://lkml.org/lkml/2018/8/27/299
> 
> This series stalled so I reached out to Marek on IRC and he was
> surprised to be listed as maintainer and asked me to resend and add
> Daniel Vetter.
> 
> Perhaps it would help to clarify that the pengutronix people should feel
> free to push patches in this area?
> 
> Right now drm/imx is mostly for IPUv3 but there are other display output
> paths on imx, such as the LCDIF supported by this driver. This LCDIF
> block is included on imx8 so still quite relevant.
> 
> Leonard Crestez (5):
>   drm/mxsfb: Move axi clk enable/disable to crtc enable/disable
>   drm/mxsfb: Fix initial corrupt frame when activating display
>   drm/mxsfb: Add pm_runtime calls to pipe_enable/disable
>   drm/mxsfb: Add PM_SLEEP support
>   drm/mxsfb: Switch to drm_atomic_helper_commit_tail_rpm

The whole set is

Reviewed-by: Sean Paul <seanpaul@...omium.org>


> 
>  drivers/gpu/drm/mxsfb/mxsfb_crtc.c | 53 +++++++++++++++++++-----------
>  drivers/gpu/drm/mxsfb/mxsfb_drv.c  | 40 ++++++++++++++++++++++
>  2 files changed, 74 insertions(+), 19 deletions(-)
> 
> -- 
> 2.17.1
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS