From 78b1d470d57dd7a6e0efda63ebad97f0d44e817c Mon Sep 17 00:00:00 2001
From: Hai Li <hali@codeaurora.org>
Date: Mon, 27 Jul 2015 13:49:45 -0400
Subject: drm/msm: Enable clocks during enable/disable_vblank() callbacks
AHB clock should be enabled before accessing registers during
enable/disable_vblank(). Since these 2 callbacks are called in
atomic context while clk_prepare may cause thread sleep, a work
is scheduled to control vblanks.
v2: fixup spinlock initialization
Signed-off-by: Hai Li <hali@codeaurora.org>
[add comment about cancel_work_sync() before drm_irq_uninstall()]
Signed-off-by: Rob Clark <robdclark@gmail.com>
---
drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c | 9 +++++++++
1 file changed, 9 insertions(+)
(limited to 'drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c')
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
index 7369ee7f0c55..64d24fcbf01a 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
@@ -86,13 +86,22 @@ irqreturn_t mdp4_irq(struct msm_kms *kms)
int mdp4_enable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+
+ mdp4_enable(mdp4_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp4_crtc_vblank(crtc), true);
+ mdp4_disable(mdp4_kms);
+
return 0;
}
void mdp4_disable_vblank(struct msm_kms *kms, struct drm_crtc *crtc)
{
+ struct mdp4_kms *mdp4_kms = to_mdp4_kms(to_mdp_kms(kms));
+
+ mdp4_enable(mdp4_kms);
mdp_update_vblank_mask(to_mdp_kms(kms),
mdp4_crtc_vblank(crtc), false);
+ mdp4_disable(mdp4_kms);
}
--
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