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Date: Mon, 13 Sep 2021 15:13:38 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, Marek Vasut <marex@...x.de>, Daniel Abrecht <public@...ielabrecht.ch>, Emil Velikov <emil.l.velikov@...il.com>, Laurent Pinchart <laurent.pinchart@...asonboard.com>, Lucas Stach <l.stach@...gutronix.de>, Stefan Agner <stefan@...er.ch>, Jagan Teki <jagan@...rulasolutions.com>, Sam Ravnborg <sam@...nborg.org>, Sasha Levin <sashal@...nel.org> Subject: [PATCH 5.10 113/236] drm: mxsfb: Clear FIFO_CLEAR bit From: Marek Vasut <marex@...x.de> [ Upstream commit 5e23c98178eb1a2cdb7c4fee9a39baf8cabf282d ] Make sure the FIFO_CLEAR bit is latched in when configuring the controller, so that the FIFO is really cleared. And then clear the FIFO_CLEAR bit, since it is not self-clearing. Fixes: 45d59d704080 ("drm: Add new driver for MXSFB controller") Signed-off-by: Marek Vasut <marex@...x.de> Cc: Daniel Abrecht <public@...ielabrecht.ch> Cc: Emil Velikov <emil.l.velikov@...il.com> Cc: Laurent Pinchart <laurent.pinchart@...asonboard.com> Cc: Lucas Stach <l.stach@...gutronix.de> Cc: Stefan Agner <stefan@...er.ch> Reviewed-by: Jagan Teki <jagan@...rulasolutions.com> Tested-by: Jagan Teki <jagan@...rulasolutions.com> # i.Core MX8MM Acked-by: Lucas Stach <l.stach@...gutronix.de> Signed-off-by: Sam Ravnborg <sam@...nborg.org> Link: https://patchwork.freedesktop.org/patch/msgid/20210620224946.189524-1-marex@denx.de Signed-off-by: Sasha Levin <sashal@...nel.org> --- drivers/gpu/drm/mxsfb/mxsfb_kms.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c b/drivers/gpu/drm/mxsfb/mxsfb_kms.c index 007ea29abfcc..b535621f4f78 100644 --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c @@ -243,6 +243,9 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb) /* Clear the FIFOs */ writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET); + readl(mxsfb->base + LCDC_CTRL1); + writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_CLR); + readl(mxsfb->base + LCDC_CTRL1); if (mxsfb->devdata->has_overlay) writel(0, mxsfb->base + LCDC_AS_CTRL); -- 2.30.2
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