On Wed, 4 Mar 2020 at 17:28, Xinliang Liu xinliang.liu@linaro.org wrote:

On Wed, 4 Mar 2020 at 00:32, John Stultz john.stultz@linaro.org wrote:

...

This reverts commit ff57c6513820efe945b61863cf4a51b79f18b592.

With the commit ff57c6513820 ("drm: kirin: Fix for hikey620 display offset problem") we added support for handling LDI overflows by resetting the hardware.

However, its been observed that when we do hit the LDI overflow condition, the irq seems to be screaming, and we do nothing but stream: [drm:ade_irq_handler [kirin_drm]] *ERROR* LDI underflow! over and over to the screen

I've tried a few appraoches to avoid this, but none has yet been successful and the cure here is worse then the original disease, so revert this for now.

Sorry to hear that. Then it seems such underflow errors can't be recovered via reset. Anyway, for this patch Acked-by: Xinliang Liu z.liuxinliang@hisilicon.com

Sorry , should be: Acked-by: Xinliang Liu xinliang.liu@linaro.org

And applied to drm-misc .

-xinliang

...

Cc: Xinliang Liu xinliang.liu@linaro.org Cc: Rongrong Zou zourongrong@gmail.com Cc: Xinwei Kong kong.kongxinwei@hisilicon.com Cc: Chen Feng puck.chen@hisilicon.com Cc: Sam Ravnborg sam@ravnborg.org Cc: David Airlie airlied@linux.ie Cc: Daniel Vetter daniel@ffwll.ch Cc: dri-devel dri-devel@lists.freedesktop.org Fixes: ff57c6513820 ("drm: kirin: Fix for hikey620 display offset problem") Signed-off-by: John Stultz john.stultz@linaro.org

---

.../gpu/drm/hisilicon/kirin/kirin_ade_reg.h | 1 - .../gpu/drm/hisilicon/kirin/kirin_drm_ade.c | 20 ------------------- 2 files changed, 21 deletions(-)

diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_ade_reg.h b/drivers/gpu/drm/hisilicon/kirin/kirin_ade_reg.h index 0da860200410..e2ac09894a6d 100644 --- a/drivers/gpu/drm/hisilicon/kirin/kirin_ade_reg.h +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_ade_reg.h @@ -83,7 +83,6 @@ #define VSIZE_OFST 20 #define LDI_INT_EN 0x741C #define FRAME_END_INT_EN_OFST 1 -#define UNDERFLOW_INT_EN_OFST 2 #define LDI_CTRL 0x7420 #define BPP_OFST 3 #define DATA_GATE_EN BIT(2) diff --git a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c index 73cd28a6ea07..86000127d4ee 100644 --- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c +++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c @@ -46,7 +46,6 @@ struct ade_hw_ctx { struct clk *media_noc_clk; struct clk *ade_pix_clk; struct reset_control *reset;

•   struct work_struct display_reset_wq;
    bool power_on;
    int irq;
  
  

@@ -136,7 +135,6 @@ static void ade_init(struct ade_hw_ctx *ctx) */ ade_update_bits(base + ADE_CTRL, FRM_END_START_OFST, FRM_END_START_MASK, REG_EFFECTIVE_IN_ADEEN_FRMEND);

•   ade_update_bits(base + LDI_INT_EN, UNDERFLOW_INT_EN_OFST, MASK(1), 1);
  

}

static bool ade_crtc_mode_fixup(struct drm_crtc *crtc, @@ -304,17 +302,6 @@ static void ade_crtc_disable_vblank(struct drm_crtc *crtc) MASK(1), 0); }

-static void drm_underflow_wq(struct work_struct *work) -{

•   struct ade_hw_ctx *ctx = container_of(work, struct ade_hw_ctx,
  

•                                         display_reset_wq);
  

•   struct drm_device *drm_dev = ctx->crtc->dev;
  

•   struct drm_atomic_state *state;
  

•   state = drm_atomic_helper_suspend(drm_dev);
  

•   drm_atomic_helper_resume(drm_dev, state);
  

-}

static irqreturn_t ade_irq_handler(int irq, void *data) { struct ade_hw_ctx *ctx = data; @@ -331,12 +318,6 @@ static irqreturn_t ade_irq_handler(int irq, void *data) MASK(1), 1); drm_crtc_handle_vblank(crtc); }

•   if (status & BIT(UNDERFLOW_INT_EN_OFST)) {
  

•           ade_update_bits(base + LDI_INT_CLR, UNDERFLOW_INT_EN_OFST,
  

•                           MASK(1), 1);
  

•           DRM_ERROR("LDI underflow!");
  

•           schedule_work(&ctx->display_reset_wq);
  

•   }
  
    return IRQ_HANDLED;
  

} @@ -919,7 +900,6 @@ static void *ade_hw_ctx_alloc(struct platform_device *pdev, if (ret) return ERR_PTR(-EIO);

•   INIT_WORK(&ctx->display_reset_wq, drm_underflow_wq);
    ctx->crtc = crtc;
  
    return ctx;
  

-- 2.17.1