| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-Id: <1438803209-9904-1-git-send-email-jilaiw@codeaurora.org>
Date: Wed, 5 Aug 2015 15:33:29 -0400
From: Jilai Wang <jilaiw@...eaurora.org>
To: dri-devel@...ts.freedesktop.org
Cc: linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
robdclark@...il.com, Jilai Wang <jilaiw@...eaurora.org>
Subject: [PATCH] drm/msm/mdp: Clear pending interrupt status before enable interrupt
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@...eaurora.org>
---
drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c | 10 +++++++---
drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h | 3 ++-
drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c | 10 +++++++---
drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h | 3 ++-
drivers/gpu/drm/msm/mdp/mdp_kms.c | 3 ++-
drivers/gpu/drm/msm/mdp/mdp_kms.h | 4 +++-
6 files changed, 23 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
index 7369ee7f..b6d491c 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_irq.c
@@ -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_mdp5_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);
diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
index 1aaedad..0cdf777 100644
--- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.h
@@ -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);
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
index 33bd4c6..7115043 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_irq.c
@@ -21,8 +21,11 @@
#include "msm_drv.h"
#include "mdp5_kms.h"
-void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask)
+void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
+ uint32_t old_irqmask)
{
+ mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_CLEAR(0),
+ irqmask ^ (irqmask & old_irqmask));
mdp5_write(to_mdp5_kms(mdp_kms), REG_MDP5_MDP_INTR_EN(0), irqmask);
}
@@ -71,9 +74,10 @@ static void mdp5_irq_mdp(struct mdp_kms *mdp_kms)
struct drm_device *dev = mdp5_kms->dev;
struct msm_drm_private *priv = dev->dev_private;
unsigned int id;
- uint32_t status;
+ uint32_t status, enable;
- status = mdp5_read(mdp5_kms, REG_MDP5_MDP_INTR_STATUS(0));
+ enable = mdp5_read(mdp5_kms, REG_MDP5_MDP_INTR_EN(0));
+ status = mdp5_read(mdp5_kms, REG_MDP5_MDP_INTR_STATUS(0)) & enable;
mdp5_write(mdp5_kms, REG_MDP5_MDP_INTR_CLEAR(0), status);
VERB("status=%08x", status);
diff --git a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
index 8542b30..403a6f5 100644
--- a/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp5/mdp5_kms.h
@@ -186,7 +186,8 @@ static inline uint32_t lm2ppdone(int lm)
int mdp5_disable(struct mdp5_kms *mdp5_kms);
int mdp5_enable(struct mdp5_kms *mdp5_kms);
-void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask);
+void mdp5_set_irqmask(struct mdp_kms *mdp_kms, uint32_t irqmask,
+ uint32_t old_irqmask);
void mdp5_irq_preinstall(struct msm_kms *kms);
int mdp5_irq_postinstall(struct msm_kms *kms);
void mdp5_irq_uninstall(struct msm_kms *kms);
diff --git a/drivers/gpu/drm/msm/mdp/mdp_kms.c b/drivers/gpu/drm/msm/mdp/mdp_kms.c
index 1988c24..6428730 100644
--- a/drivers/gpu/drm/msm/mdp/mdp_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp_kms.c
@@ -39,7 +39,8 @@ static void update_irq(struct mdp_kms *mdp_kms)
list_for_each_entry(irq, &mdp_kms->irq_list, node)
irqmask |= irq->irqmask;
- mdp_kms->funcs->set_irqmask(mdp_kms, irqmask);
+ mdp_kms->funcs->set_irqmask(mdp_kms, irqmask, mdp_kms->cur_irq_mask);
+ mdp_kms->cur_irq_mask = irqmask;
}
/* if an mdp_irq's irqmask has changed, such as when mdp5 crtc<->encoder
diff --git a/drivers/gpu/drm/msm/mdp/mdp_kms.h b/drivers/gpu/drm/msm/mdp/mdp_kms.h
index 3db25df..39ead11 100644
--- a/drivers/gpu/drm/msm/mdp/mdp_kms.h
+++ b/drivers/gpu/drm/msm/mdp/mdp_kms.h
@@ -30,7 +30,8 @@ struct mdp_kms;
struct mdp_kms_funcs {
struct msm_kms_funcs base;
- void (*set_irqmask)(struct mdp_kms *mdp_kms, uint32_t irqmask);
+ void (*set_irqmask)(struct mdp_kms *mdp_kms, uint32_t irqmask,
+ uint32_t old_irqmask);
};
struct mdp_kms {
@@ -42,6 +43,7 @@ struct mdp_kms {
bool in_irq;
struct list_head irq_list; /* list of mdp4_irq */
uint32_t vblank_mask; /* irq bits set for userspace vblank */
+ uint32_t cur_irq_mask; /* current irq mask */
};
#define to_mdp_kms(x) container_of(x, struct mdp_kms, base)
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists