[PATCH 4.9 32/38] drm/hisilicon: Ensure LDI regs are properly configured.

Greg Kroah-Hartman
2017-12-04T16:02:41Z

From: Peter Griffin <peter.griffin@linaro.org>

commit a2f042430784d86eb2b7a6d2a869f552da30edba upstream.

This patch fixes the following soft lockup:
BUG: soft lockup - CPU#0 stuck for 23s! [weston:307]

On weston idle-timeout the IP is powered down and reset
asserted. On weston resume we get a massive vblank
IRQ storm due to the LDI registers having lost some state.

This state loss is caused by ade_crtc_atomic_begin() not
calling ade_ldi_set_mode(). With this patch applied
resuming from Weston idle-timeout works well.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Tested-by: John Stultz <john.stultz@linaro.org>
Reviewed-by: Xinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: Xinliang Liu <xinliang.liu@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
+++ b/drivers/gpu/drm/hisilicon/kirin/kirin_drm_ade.c
@@ -521,9 +521,12 @@ static void ade_crtc_atomic_begin(struct
{
struct ade_crtc *acrtc = to_ade_crtc(crtc);
struct ade_hw_ctx *ctx = acrtc->ctx;
+ struct drm_display_mode *mode = &crtc->state->mode;
+ struct drm_display_mode *adj_mode = &crtc->state->adjusted_mode;

if (!ctx->power_on)
(void)ade_power_up(ctx);
+ ade_ldi_set_mode(acrtc, mode, adj_mode);
}

static void ade_crtc_atomic_flush(struct drm_crtc *crtc,