2016-03-22 15:08:24

by Tomeu Vizoso

Subject: [PATCH v2] drm/rockchip: vop: Disable planes when disabling CRTC

When a VOP is re-enabled, it will start scanning right away the
framebuffers that were configured from the last time, even if those have
been destroyed already.

To prevent the VOP from trying to access freed memory, disable all its
windows when the CRTC is being disabled, then each window will get a
valid framebuffer address before it's enabled again.

Signed-off-by: Tomeu Vizoso <[email protected]>
Link: http://lkml.kernel.org/g/CAAObsKAv+05ih5U+=4kic_NsjGMhfxYheHR8xXXmacZs+p5SHw@mail.gmail.com
---
drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 15 +++++++++++++++
1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
index 5e57f5b2e4b0..e2118e62345b 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
@@ -499,10 +499,25 @@ err_disable_hclk:
static void vop_crtc_disable(struct drm_crtc *crtc)
{
struct vop *vop = to_vop(crtc);
+ int i;

if (!vop->is_enabled)
return;

+ /*
+ * We need to make sure that all windows are disabled before we
+ * disable that crtc. Otherwise we might try to scan from a destroyed
+ * buffer later.
+ */
+ for (i = 0; i < vop->data->win_size; i++) {
+ struct vop_win *vop_win = &vop->win[i];
+ const struct vop_win_data *win = vop_win->data;
+
+ spin_lock(&vop->reg_lock);
+ VOP_WIN_SET(vop, win, enable, 0);
+ spin_unlock(&vop->reg_lock);
+ }
+
drm_crtc_vblank_off(crtc);

/*
--
2.5.0

2016-03-28 06:39:50

by Mark yao

Subject: Re: [PATCH v2] drm/rockchip: vop: Disable planes when disabling CRTC

On 2016年03月22日 23:08, Tomeu Vizoso wrote:
> When a VOP is re-enabled, it will start scanning right away the
> framebuffers that were configured from the last time, even if those have
> been destroyed already.
>
> To prevent the VOP from trying to access freed memory, disable all its
> windows when the CRTC is being disabled, then each window will get a
> valid framebuffer address before it's enabled again.
>
> Signed-off-by: Tomeu Vizoso <[email protected]>
> Link: http://lkml.kernel.org/g/CAAObsKAv+05ih5U+=4kic_NsjGMhfxYheHR8xXXmacZs+p5SHw@mail.gmail.com
> ---
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 15 +++++++++++++++
> 1 file changed, 15 insertions(+)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index 5e57f5b2e4b0..e2118e62345b 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -499,10 +499,25 @@ err_disable_hclk:
> static void vop_crtc_disable(struct drm_crtc *crtc)
> {
> struct vop *vop = to_vop(crtc);
> + int i;
>
> if (!vop->is_enabled)
> return;
>
> + /*
> + * We need to make sure that all windows are disabled before we
> + * disable that crtc. Otherwise we might try to scan from a destroyed
> + * buffer later.
> + */
> + for (i = 0; i < vop->data->win_size; i++) {
> + struct vop_win *vop_win = &vop->win[i];
> + const struct vop_win_data *win = vop_win->data;
> +
> + spin_lock(&vop->reg_lock);
> + VOP_WIN_SET(vop, win, enable, 0);
> + spin_unlock(&vop->reg_lock);
> + }
> +
> drm_crtc_vblank_off(crtc);
>
> /*
Looks good for me, and it works on my board.

Applied to my drm-fixes.

Thanks

--
Ｍark Yao