From: John Stultz john.stultz@linaro.org

commit 1b79cfd99ff5127e6a143767b51694a527b3ea38 upstream.

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.

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 Acked-by: Xinliang Liu xinliang.liu@linaro.org Signed-off-by: Xinliang Liu xinliang.liu@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20200303163228.52741-1-john.st... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

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

--- 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) --- 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 * */ 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(stru 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 i 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 pla if (ret) return ERR_PTR(-EIO);

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

return ctx;