Vop standby will take effect at end of current frame, if dsp_hold_valid_irq happen, it means vop standby complete.

we must wait standby complete when we want to disable aclk, if not, memory bus maybe dead.

Reviewed-by: Heiko Stuebner heiko@sntech.de Reviewed-by: Daniel Kurtz djkurtz@chromium.org Signed-off-by: Mark Yao mark.yao@rock-chips.com --- Changes in v4: - fix comment syntax error

Changes in v3: - if vop write vop regs when vop clocks is disabled, WARN_ON maybe have no chance to do crash dump, so reuse BUG_ON. - dsp hold irq only happen when standby bit 0->1 take effect, no need to do completion check.

Changes in v2: - use WARN_ON instead of BUG_ON.

drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 75 ++++++++++++++++++++++----- 1 file changed, 62 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c index fb25836..8032071 100644 --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c @@ -89,6 +89,7 @@ struct vop { /* mutex vsync_ work */ struct mutex vsync_mutex; bool vsync_work_pending; + struct completion dsp_hold_completion;

const struct vop_data *data;

@@ -382,6 +383,34 @@ static bool is_alpha_support(uint32_t format) } }

+static void vop_dsp_hold_valid_irq_enable(struct vop *vop) +{ + unsigned long flags; + + BUG_ON(!vop->is_enabled); + + spin_lock_irqsave(&vop->irq_lock, flags); + + vop_mask_write(vop, INTR_CTRL0, DSP_HOLD_VALID_INTR_MASK, + DSP_HOLD_VALID_INTR_EN(1)); + + spin_unlock_irqrestore(&vop->irq_lock, flags); +} + +static void vop_dsp_hold_valid_irq_disable(struct vop *vop) +{ + unsigned long flags; + + BUG_ON(!vop->is_enabled); + + spin_lock_irqsave(&vop->irq_lock, flags); + + vop_mask_write(vop, INTR_CTRL0, DSP_HOLD_VALID_INTR_MASK, + DSP_HOLD_VALID_INTR_EN(0)); + + spin_unlock_irqrestore(&vop->irq_lock, flags); +} + static void vop_enable(struct drm_crtc *crtc) { struct vop *vop = to_vop(crtc); @@ -454,26 +483,36 @@ static void vop_disable(struct drm_crtc *crtc)

drm_vblank_off(crtc->dev, vop->pipe);

- disable_irq(vop->irq); - /* - * TODO: Since standby doesn't take effect until the next vblank, - * when we turn off dclk below, the vop is probably still active. + * Vop standby will take effect at end of current frame, + * if dsp hold valid irq happen, it means standby complete. + * + * we must wait standby complete when we want to disable aclk, + * if not, memory bus maybe dead. */ + reinit_completion(&vop->dsp_hold_completion); + vop_dsp_hold_valid_irq_enable(vop); + spin_lock(&vop->reg_lock);

VOP_CTRL_SET(vop, standby, 1);

spin_unlock(&vop->reg_lock);

+ wait_for_completion(&vop->dsp_hold_completion); + + vop_dsp_hold_valid_irq_disable(vop); + + disable_irq(vop->irq); + vop->is_enabled = false; + /* - * disable dclk to stop frame scan, so we can safely detach iommu, + * vop standby complete, so iommu detach is safe. */ - clk_disable(vop->dclk); - rockchip_drm_dma_detach_device(vop->drm_dev, vop->dev);

+ clk_disable(vop->dclk); clk_disable(vop->aclk); clk_disable(vop->hclk); } @@ -1086,6 +1125,7 @@ static irqreturn_t vop_isr(int irq, void *data) struct vop *vop = data; uint32_t intr0_reg, active_irqs; unsigned long flags; + int ret = IRQ_NONE;

/* * INTR_CTRL0 register has interrupt status, enable and clear bits, we @@ -1104,15 +1144,23 @@ static irqreturn_t vop_isr(int irq, void *data) if (!active_irqs) return IRQ_NONE;

- /* Only Frame Start Interrupt is enabled; other irqs are spurious. */ - if (!(active_irqs & FS_INTR)) { - DRM_ERROR("Unknown VOP IRQs: %#02x\n", active_irqs); - return IRQ_NONE; + if (active_irqs & DSP_HOLD_VALID_INTR) { + complete(&vop->dsp_hold_completion); + active_irqs &= ~DSP_HOLD_VALID_INTR; + ret = IRQ_HANDLED; }

- drm_handle_vblank(vop->drm_dev, vop->pipe); + if (active_irqs & FS_INTR) { + drm_handle_vblank(vop->drm_dev, vop->pipe); + active_irqs &= ~FS_INTR; + ret = (vop->vsync_work_pending) ? IRQ_WAKE_THREAD : IRQ_HANDLED; + }

- return (vop->vsync_work_pending) ? IRQ_WAKE_THREAD : IRQ_HANDLED; + /* Unhandled irqs are spurious. */ + if (active_irqs) + DRM_ERROR("Unknown VOP IRQs: %#02x\n", active_irqs); + + return ret; }

static int vop_create_crtc(struct vop *vop) @@ -1194,6 +1242,7 @@ static int vop_create_crtc(struct vop *vop) goto err_cleanup_crtc; }

+ init_completion(&vop->dsp_hold_completion); crtc->port = port; vop->pipe = drm_crtc_index(crtc); rockchip_register_crtc_funcs(drm_dev, &private_crtc_funcs, vop->pipe);