Patch "drm/hisilicon: Ensure LDI regs are properly configured." has been added to the 4.9-stable tree

This is a note to let you know that I've just added the patch titled

drm/hisilicon: Ensure LDI regs are properly configured.

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
drm-hisilicon-ensure-ldi-regs-are-properly-configured.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Peter Griffin <[email protected]>
Date: Tue, 15 Aug 2017 15:14:25 +0100
Subject: drm/hisilicon: Ensure LDI regs are properly configured.

From: Peter Griffin <[email protected]>

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.

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

@@ -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,

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/drm-hisilicon-ensure-ldi-regs-are-properly-configured.patch