drm: rcar-du: Fix external clock error checks

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[ Upstream commit 63a298f22a ]

The rcar-du driver supports probe deferral for external clocks, but
implements it badly by checking the wrong pointer due to a bad copy and
paste. Fix it.

While at it, reject invalid clocks outright for DU channels that have a
display PLL, as the external clock is mandatory in that case. This
avoids a WARN_ON() at runtime.

Fixes: 1b30dbde85 ("drm: rcar-du: Add support for external pixel clock")
Reported-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Laurent Pinchart 2018-11-06 17:13:44 +02:00 • committed by Greg Kroah-Hartman

parent f9acb02096

commit fe6148df4d

1 changed files with 9 additions and 5 deletions

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drivers/gpu/drm/rcar-du/rcar_du_crtc.c

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