Patch "drm/imx: ipuv3-plane: Switch EBA buffer only when we don't need modeset" has been added to the 4.8-stable tree

[<gregkh@linuxfoundation.org>]

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

    drm/imx: ipuv3-plane: Switch EBA buffer only when we don't need modeset

to the 4.8-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-imx-ipuv3-plane-switch-eba-buffer-only-when-we-don-t-need-modeset.patch
and it can be found in the queue-4.8 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 43daa01323da37a3692cabe1579ef5c2c4372e06 Mon Sep 17 00:00:00 2001
From: Liu Ying <gnuiyl@gmail.com>
Date: Mon, 10 Oct 2016 14:50:06 +0800
Subject: drm/imx: ipuv3-plane: Switch EBA buffer only when we don't need modeset

From: Liu Ying <gnuiyl@gmail.com>

commit 43daa01323da37a3692cabe1579ef5c2c4372e06 upstream.

We added active plane reconfiguration support by forcing a full modeset
operation.  So, looking at old_plane_state->fb to determine whether we need to
switch EBA buffer(for hardware double buffering) in ipu_plane_atomic_set_base()
or not is no more correct.  Instead, we should do that only when we don't need
modeset, otherwise, we initialize the two EBA buffers with the buffer address.

Fixes: c6c1f9bc798b ("drm/imx: Add active plane reconfiguration support")
Signed-off-by: Liu Ying <gnuiyl@gmail.com>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/imx/ipuv3-plane.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/gpu/drm/imx/ipuv3-plane.c
+++ b/drivers/gpu/drm/imx/ipuv3-plane.c
@@ -108,6 +108,7 @@ static void ipu_plane_atomic_set_base(st
 {
 	struct drm_plane *plane = &ipu_plane->base;
 	struct drm_plane_state *state = plane->state;
+	struct drm_crtc_state *crtc_state = state->crtc->state;
 	struct drm_framebuffer *fb = state->fb;
 	unsigned long eba, ubo, vbo;
 	int active;
@@ -149,7 +150,7 @@ static void ipu_plane_atomic_set_base(st
 		break;
 	}
 
-	if (old_state->fb) {
+	if (!drm_atomic_crtc_needs_modeset(crtc_state)) {
 		active = ipu_idmac_get_current_buffer(ipu_plane->ipu_ch);
 		ipu_cpmem_set_buffer(ipu_plane->ipu_ch, !active, eba);
 		ipu_idmac_select_buffer(ipu_plane->ipu_ch, !active);


Patches currently in stable-queue which might be from gnuiyl@gmail.com are

queue-4.8/drm-imx-ipuv3-plane-access-old-u-vbo-properly-in-atomic_check-for-yu12-yv12.patch
queue-4.8/drm-imx-ipuv3-plane-switch-eba-buffer-only-when-we-don-t-need-modeset.patch