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%3Ba=su...
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