Patch "drm: rcar-du: Use the VBK interrupt for vblank events" has been added to the 4.4-stable tree

Patch "drm: rcar-du: Use the VBK interrupt for vblank events" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm: rcar-du: Use the VBK interrupt for vblank events

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-rcar-du-use-the-vbk-interrupt-for-vblank-events.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From cbbb90b0c084d7dfb2ed8e3fecf8df200fbdd2a0 Mon Sep 17 00:00:00 2001
From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Date: Mon, 10 Jul 2017 23:46:39 +0300
Subject: drm: rcar-du: Use the VBK interrupt for vblank events

From: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

commit cbbb90b0c084d7dfb2ed8e3fecf8df200fbdd2a0 upstream.

When implementing support for interlaced modes, the driver switched from
reporting vblank events on the vertical blanking (VBK) interrupt to the
frame end interrupt (FRM). This incorrectly divided the reported refresh
rate by two. Fix it by moving back to the VBK interrupt.

Fixes: 906eff7fcada ("drm: rcar-du: Implement support for interlaced modes")
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Signed-off-by: thongsyho <thong.ho.px@rvc.renesas.com>
Signed-off-by: Nhan Nguyen <nhan.nguyen.yb@renesas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/gpu/drm/rcar-du/rcar_du_crtc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -531,7 +531,7 @@ static irqreturn_t rcar_du_crtc_irq(int
 	status = rcar_du_crtc_read(rcrtc, DSSR);
 	rcar_du_crtc_write(rcrtc, DSRCR, status & DSRCR_MASK);
 
-	if (status & DSSR_FRM) {
+	if (status & DSSR_VBK) {
 		drm_handle_vblank(rcrtc->crtc.dev, rcrtc->index);
 		rcar_du_crtc_finish_page_flip(rcrtc);
 		ret = IRQ_HANDLED;


Patches currently in stable-queue which might be from laurent.pinchart+renesas@ideasonboard.com are

queue-4.4/drm-rcar-du-use-the-vbk-interrupt-for-vblank-events.patch
queue-4.4/drm-rcar-du-fix-race-condition-when-disabling-planes-at-crtc-stop.patch