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msm_fb: display: Make sysfs read request interruptible

Browse source 
Change blocking sysfs read request to be interruptible and protect
vsync timestamp value to prevent corruption.

Change-Id: I510d84134b0ab70d17729e8c53c91fa926035142
Signed-off-by: Mayank Chopra <makchopra@codeaurora.org>

Conflicts:

	drivers/video/msm/mdp4_overlay_dsi_cmd.c
	drivers/video/msm/mdp4_overlay_dsi_video.c

Signed-off-by: Siddhartha Agrawal <agrawals@codeaurora.org>
This commit is contained in:
Mayank Chopra 2012-10-04 20:29:52 +05:30 committed by Stephen Boyd
parent 46fd6a9478
commit 7fa332360f
4 changed files with 37 additions and 14 deletions
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10
drivers/video/msm/mdp4_overlay_dsi_cmd.c
View file

@ -513,9 +513,9 @@ static void primary_rdptr_isr(int cndx)
pr_debug("%s: ISR, tick=%d pan=%d cpu=%d\n", __func__,
vctrl->expire_tick, vctrl->pan_display, smp_processor_id());
vctrl->rdptr_intr_tot++;
vctrl->vsync_time = ktime_get();
spin_lock(&vctrl->spin_lock);
vctrl->vsync_time = ktime_get();
complete_all(&vctrl->vsync_comp);
vctrl->wait_vsync_cnt = 0;
@ -655,6 +655,7 @@ static ssize_t vsync_show_event(struct device *dev,
struct vsycn_ctrl *vctrl;
ssize_t ret = 0;
unsigned long flags;
u64 vsync_tick;
cndx = 0;
vctrl = &vsync_ctrl_db[0];
@ -672,8 +673,11 @@ static ssize_t vsync_show_event(struct device *dev,
if (ret < 0)
return ret;
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu",
ktime_to_ns(vctrl->vsync_time));
spin_lock_irqsave(&vctrl->spin_lock, flags);
vsync_tick = ktime_to_ns(vctrl->vsync_time);
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu", vsync_tick);
buf[strlen(buf) + 1] = '\0';
return ret;
}

11
drivers/video/msm/mdp4_overlay_dsi_video.c
View file

@ -381,6 +381,7 @@ static ssize_t vsync_show_event(struct device *dev,
struct vsycn_ctrl *vctrl;
ssize_t ret = 0;
unsigned long flags;
u64 vsync_tick;
cndx = 0;
vctrl = &vsync_ctrl_db[0];
@ -398,8 +399,11 @@ static ssize_t vsync_show_event(struct device *dev,
if (ret < 0)
return ret;
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu",
ktime_to_ns(vctrl->vsync_time));
spin_lock_irqsave(&vctrl->spin_lock, flags);
vsync_tick = ktime_to_ns(vctrl->vsync_time);
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu", vsync_tick);
buf[strlen(buf) + 1] = '\0';
return ret;
}
@ -937,9 +941,10 @@ void mdp4_primary_vsync_dsi_video(void)
cndx = 0;
vctrl = &vsync_ctrl_db[cndx];
pr_debug("%s: cpu=%d\n", __func__, smp_processor_id());
vctrl->vsync_time = ktime_get();
spin_lock(&vctrl->spin_lock);
vctrl->vsync_time = ktime_get();
if (vctrl->wait_vsync_cnt) {
complete_all(&vctrl->vsync_comp);
vctrl->wait_vsync_cnt = 0;

15
drivers/video/msm/mdp4_overlay_dtv.c
View file

@ -322,6 +322,7 @@ static ssize_t vsync_show_event(struct device *dev,
struct vsycn_ctrl *vctrl;
ssize_t ret = 0;
unsigned long flags;
u64 vsync_tick;
cndx = 0;
vctrl = &vsync_ctrl_db[0];
@ -336,10 +337,15 @@ static ssize_t vsync_show_event(struct device *dev,
INIT_COMPLETION(vctrl->vsync_comp);
vctrl->wait_vsync_cnt++;
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
wait_for_completion(&vctrl->vsync_comp);
ret = wait_for_completion_interruptible(&vctrl->vsync_comp);
if (ret)
return ret;
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu",
ktime_to_ns(vctrl->vsync_time));
spin_lock_irqsave(&vctrl->spin_lock, flags);
vsync_tick = ktime_to_ns(vctrl->vsync_time);
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu", vsync_tick);
buf[strlen(buf) + 1] = '\0';
return ret;
}
@ -861,9 +867,10 @@ void mdp4_external_vsync_dtv(void)
cndx = 0;
vctrl = &vsync_ctrl_db[cndx];
pr_debug("%s: cpu=%d\n", __func__, smp_processor_id());
vctrl->vsync_time = ktime_get();
spin_lock(&vctrl->spin_lock);
vctrl->vsync_time = ktime_get();
if (vctrl->wait_vsync_cnt) {
complete_all(&vctrl->vsync_comp);
vctrl->wait_vsync_cnt = 0;

15
drivers/video/msm/mdp4_overlay_lcdc.c
View file

@ -366,6 +366,7 @@ static ssize_t vsync_show_event(struct device *dev,
struct vsycn_ctrl *vctrl;
ssize_t ret = 0;
unsigned long flags;
u64 vsync_tick;
cndx = 0;
vctrl = &vsync_ctrl_db[0];
@ -379,10 +380,15 @@ static ssize_t vsync_show_event(struct device *dev,
INIT_COMPLETION(vctrl->vsync_comp);
vctrl->wait_vsync_cnt++;
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
wait_for_completion(&vctrl->vsync_comp);
ret = wait_for_completion_interruptible(&vctrl->vsync_comp);
if (ret)
return ret;
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu",
ktime_to_ns(vctrl->vsync_time));
spin_lock_irqsave(&vctrl->spin_lock, flags);
vsync_tick = ktime_to_ns(vctrl->vsync_time);
spin_unlock_irqrestore(&vctrl->spin_lock, flags);
ret = snprintf(buf, PAGE_SIZE, "VSYNC=%llu", vsync_tick);
buf[strlen(buf) + 1] = '\0';
return ret;
}
@ -811,9 +817,10 @@ void mdp4_primary_vsync_lcdc(void)
cndx = 0;
vctrl = &vsync_ctrl_db[cndx];
pr_debug("%s: cpu=%d\n", __func__, smp_processor_id());
vctrl->vsync_time = ktime_get();
spin_lock(&vctrl->spin_lock);
vctrl->vsync_time = ktime_get();
if (vctrl->wait_vsync_cnt) {
complete_all(&vctrl->vsync_comp);
vctrl->wait_vsync_cnt = 0;