Re: FAILED: patch "[PATCH] drm: atmel-hlcdc: enable clock before configuring timing" failed to apply to 4.19-stable tree

[Sasha Levin <sashal@kernel.org>]

On Sun, Feb 09, 2020 at 12:40:20PM +0100, gregkh@linuxfoundation.org wrote:
>
>The patch below does not apply to the 4.19-stable tree.
>If someone wants it applied there, or to any other stable or longterm
>tree, then please email the backport, including the original git commit
>id to <stable@vger.kernel.org>.
>
>thanks,
>
>greg k-h
>
>------------------ original commit in Linus's tree ------------------
>
>From 2c1fb9d86f6820abbfaa38a6836157c76ccb4e7b Mon Sep 17 00:00:00 2001
>From: Claudiu Beznea <claudiu.beznea@microchip.com>
>Date: Wed, 18 Dec 2019 14:28:25 +0200
>Subject: [PATCH] drm: atmel-hlcdc: enable clock before configuring timing
> engine
>
>Changing pixel clock source without having this clock source enabled
>will block the timing engine and the next operations after (in this case
>setting ATMEL_HLCDC_CFG(5) settings in atmel_hlcdc_crtc_mode_set_nofb()
>will fail). It is recomended (although in datasheet this is not present)
>to actually enabled pixel clock source before doing any changes on timing
>enginge (only SAM9X60 datasheet specifies that the peripheral clock and
>pixel clock must be enabled before using LCD controller).
>
>Fixes: 1a396789f65a ("drm: add Atmel HLCDC Display Controller support")
>Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
>Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
>Cc: Boris Brezillon <boris.brezillon@free-electrons.com>
>Cc: <stable@vger.kernel.org> # v4.0+
>Link: https://patchwork.freedesktop.org/patch/msgid/1576672109-22707-3-git-send-email-claudiu.beznea@microchip.com

I've adjusted context because we don't have:

a6eca2abdd42 ("drm: atmel-hlcdc: add config option for clock selection")
319711f98208 ("drm/atmel-hlcdc: prefer a higher rate clock as pixel-clock base")

and queued it for 4.19-4.4.

-- 
Thanks,
Sasha