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drm/msm/mdp: Clear pending interrupt status before enable interrupt

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Pending interrupt status needs to be cleared before enable the
interrupt. Otherwise it's possible to get a pending interrupt instead
of an incoming interrupt.

Signed-off-by: Jilai Wang <jilaiw@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
Cette révision appartient à :
jilai wang
2015-08-05 15:33:29 -04:00
révisé par Rob Clark
Parent 8089082fae
révision 29f034d776
6 fichiers modifiés avec 23 ajouts et 10 suppressions
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10
drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
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@@ -19,8 +19,11 @@
#include "msm_drv.h"
#include "mdp4_kms.h"
void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask)
void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
uint32_t old_irqmask)
{
mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_CLEAR,
irqmask ^ (irqmask & old_irqmask));
mdp4_write(to_mdp4_kms(mdp_kms), REG_MDP4_INTR_ENABLE, irqmask);
}
@@ -68,9 +71,10 @@ irqreturn_t mdp4_irq(struct msm_kms *kms)
struct drm_device *dev = mdp4_kms->dev;
struct msm_drm_private *priv = dev->dev_private;
unsigned int id;
uint32_t status;
uint32_t status, enable;
status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS);
enable = mdp4_read(mdp4_kms, REG_MDP4_INTR_ENABLE);
status = mdp4_read(mdp4_kms, REG_MDP4_INTR_STATUS) & enable;
mdp4_write(mdp4_kms, REG_MDP4_INTR_CLEAR, status);
VERB("status=%08x", status);

3
drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
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@@ -167,7 +167,8 @@ static inline uint32_t mixercfg(uint32_t mixer_cfg, int mixer,
int mdp4_disable(struct mdp4_kms *mdp4_kms);
int mdp4_enable(struct mdp4_kms *mdp4_kms);
void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask);
void mdp4_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
uint32_t old_irqmask);
void mdp4_irq_preinstall(struct msm_kms *kms);
int mdp4_irq_postinstall(struct msm_kms *kms);
void mdp4_irq_uninstall(struct msm_kms *kms);