Sean,
On 08/16/2016 07:12 AM, Sean Paul wrote:
> If vop_enable fails, don't continue on, it causes system hangs.
>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
Also meet this problem on my Rk3399 Kevin board. VOP just failed to get
the pm_runtime at resume time, but ????er still just continue without
anything enable rightly, oops, and then system crashed :(
So this patch looks good to me, and also fix my problem, thanks:
??viewed-by: Yakir Yang <ykk at rock-chips.com>
Tested-by: Yakir Yang <ykk at rock-chips.com>
Thanks,
- Yakir
> ---
>
> This patch uses the new DRM_DEV_ERROR logging, so it should be applied on
> top of "[PATCH 2/2] drm/rockchip: Use DRM_DEV_ERROR in vop".
>
> Changes in v2:
> - Escalate dev_err to WARN_ON for clk_enable failures (Daniel Vetter)
>
> Sean
>
>
> drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 31 ++++++++++++++++-------------
> 1 file changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> index ec8ad00..a176d03 100644
> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
> @@ -428,7 +428,7 @@ static void vop_dsp_hold_valid_irq_disable(struct vop *vop)
> spin_unlock_irqrestore(&vop->irq_lock, flags);
> }
>
> -static void vop_enable(struct drm_crtc *crtc)
> +static int vop_enable(struct drm_crtc *crtc)
> {
> struct vop *vop = to_vop(crtc);
> int ret;
> @@ -436,26 +436,20 @@ static void vop_enable(struct drm_crtc *crtc)
> ret = pm_runtime_get_sync(vop->dev);
> if (ret < 0) {
> dev_err(vop->dev, "failed to get pm runtime: %d\n", ret);
> - return;
> + goto err_put_pm_runtime;
> }
>
> ret = clk_enable(vop->hclk);
> - if (ret < 0) {
> - dev_err(vop->dev, "failed to enable hclk - %d\n", ret);
> - return;
> - }
> + if (WARN_ON(ret < 0))
> + goto err_put_pm_runtime;
>
> ret = clk_enable(vop->dclk);
> - if (ret < 0) {
> - dev_err(vop->dev, "failed to enable dclk - %d\n", ret);
> + if (WARN_ON(ret < 0))
> goto err_disable_hclk;
> - }
>
> ret = clk_enable(vop->aclk);
> - if (ret < 0) {
> - dev_err(vop->dev, "failed to enable aclk - %d\n", ret);
> + if (WARN_ON(ret < 0))
> goto err_disable_dclk;
> - }
>
> /*
> * Slave iommu shares power, irq and clock with vop. It was associated
> @@ -485,7 +479,7 @@ static void vop_enable(struct drm_crtc *crtc)
>
> drm_crtc_vblank_on(crtc);
>
> - return;
> + return 0;
>
> err_disable_aclk:
> clk_disable(vop->aclk);
> @@ -493,6 +487,9 @@ err_disable_dclk:
> clk_disable(vop->dclk);
> err_disable_hclk:
> clk_disable(vop->hclk);
> +err_put_pm_runtime:
> + pm_runtime_put_sync(vop->dev);
> + return ret;
> }
>
> static void vop_crtc_disable(struct drm_crtc *crtc)
> @@ -912,10 +909,16 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
> u16 vact_st = adjusted_mode->vtotal - adjusted_mode->vsync_start;
> u16 vact_end = vact_st + vdisplay;
> uint32_t val;
> + int ret;
>
> WARN_ON(vop->event);
>
> - vop_enable(crtc);
> + ret = vop_enable(crtc);
> + if (ret) {
> + DRM_DEV_ERROR(vop->dev, "Failed to enable vop (%d)\n", ret);
> + return;
> + }
> +
> /*
> * If dclk rate is zero, mean that scanout is stop,
> * we don't need wait any more.
