[PATCH 11/23] OMAP: DSS2: Taal: add mutex to protect panel data
Tomi Valkeinen
tomi.valkeinen at nokia.com
Tue May 18 08:35:02 EDT 2010
Signed-off-by: Tomi Valkeinen <tomi.valkeinen at nokia.com>
---
drivers/video/omap2/displays/panel-taal.c | 140 ++++++++++++++++++++++++-----
1 files changed, 119 insertions(+), 21 deletions(-)
diff --git a/drivers/video/omap2/displays/panel-taal.c b/drivers/video/omap2/displays/panel-taal.c
index 4f3988a..1799096 100644
--- a/drivers/video/omap2/displays/panel-taal.c
+++ b/drivers/video/omap2/displays/panel-taal.c
@@ -31,6 +31,7 @@
#include <linux/completion.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
+#include <linux/mutex.h>
#include <plat/display.h>
@@ -67,6 +68,8 @@
static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable);
struct taal_data {
+ struct mutex lock;
+
struct backlight_device *bldev;
unsigned long hw_guard_end; /* next value of jiffies when we can
@@ -510,6 +513,8 @@ static int taal_probe(struct omap_dss_device *dssdev)
}
td->dssdev = dssdev;
+ mutex_init(&td->lock);
+
td->esd_wq = create_singlethread_workqueue("taal_esd");
if (td->esd_wq == NULL) {
dev_err(&dssdev->dev, "can't create ESD workqueue\n");
@@ -733,54 +738,96 @@ static void taal_power_off(struct omap_dss_device *dssdev)
static int taal_enable(struct omap_dss_device *dssdev)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
int r;
+
dev_dbg(&dssdev->dev, "enable\n");
- if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED)
- return -EINVAL;
+ mutex_lock(&td->lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_DISABLED) {
+ r = -EINVAL;
+ goto err;
+ }
r = taal_power_on(dssdev);
if (r)
- return r;
+ goto err;
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+ mutex_unlock(&td->lock);
+
+ return 0;
+err:
+ dev_dbg(&dssdev->dev, "enable failed\n");
+ mutex_unlock(&td->lock);
return r;
}
static void taal_disable(struct omap_dss_device *dssdev)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
+
dev_dbg(&dssdev->dev, "disable\n");
+ mutex_lock(&td->lock);
+
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE)
taal_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_DISABLED;
+
+ mutex_unlock(&td->lock);
}
static int taal_suspend(struct omap_dss_device *dssdev)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
+ int r;
+
dev_dbg(&dssdev->dev, "suspend\n");
- if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE)
- return -EINVAL;
+ mutex_lock(&td->lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_ACTIVE) {
+ r = -EINVAL;
+ goto err;
+ }
taal_power_off(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_SUSPENDED;
+ mutex_unlock(&td->lock);
+
return 0;
+err:
+ mutex_unlock(&td->lock);
+ return r;
}
static int taal_resume(struct omap_dss_device *dssdev)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
int r;
+
dev_dbg(&dssdev->dev, "resume\n");
- if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED)
- return -EINVAL;
+ mutex_lock(&td->lock);
+
+ if (dssdev->state != OMAP_DSS_DISPLAY_SUSPENDED) {
+ r = -EINVAL;
+ goto err;
+ }
r = taal_power_on(dssdev);
dssdev->state = OMAP_DSS_DISPLAY_ACTIVE;
+
+ mutex_unlock(&td->lock);
+
+ return r;
+err:
+ mutex_unlock(&td->lock);
return r;
}
@@ -799,6 +846,7 @@ static int taal_update(struct omap_dss_device *dssdev,
dev_dbg(&dssdev->dev, "update %d, %d, %d x %d\n", x, y, w, h);
+ mutex_lock(&td->lock);
dsi_bus_lock();
if (!td->enabled) {
@@ -820,18 +868,24 @@ static int taal_update(struct omap_dss_device *dssdev,
goto err;
/* note: no bus_unlock here. unlock is in framedone_cb */
+ mutex_unlock(&td->lock);
return 0;
err:
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return r;
}
static int taal_sync(struct omap_dss_device *dssdev)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
+
dev_dbg(&dssdev->dev, "sync\n");
+ mutex_lock(&td->lock);
dsi_bus_lock();
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
dev_dbg(&dssdev->dev, "sync done\n");
@@ -861,13 +915,16 @@ static int _taal_enable_te(struct omap_dss_device *dssdev, bool enable)
static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
int r;
+ mutex_lock(&td->lock);
dsi_bus_lock();
r = _taal_enable_te(dssdev, enable);
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return r;
}
@@ -875,7 +932,13 @@ static int taal_enable_te(struct omap_dss_device *dssdev, bool enable)
static int taal_get_te(struct omap_dss_device *dssdev)
{
struct taal_data *td = dev_get_drvdata(&dssdev->dev);
- return td->te_enabled;
+ int r;
+
+ mutex_lock(&td->lock);
+ r = td->te_enabled;
+ mutex_unlock(&td->lock);
+
+ return r;
}
static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
@@ -885,6 +948,7 @@ static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
dev_dbg(&dssdev->dev, "rotate %d\n", rotate);
+ mutex_lock(&td->lock);
dsi_bus_lock();
if (td->enabled) {
@@ -896,16 +960,24 @@ static int taal_rotate(struct omap_dss_device *dssdev, u8 rotate)
td->rotate = rotate;
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return 0;
err:
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return r;
}
static u8 taal_get_rotate(struct omap_dss_device *dssdev)
{
struct taal_data *td = dev_get_drvdata(&dssdev->dev);
- return td->rotate;
+ int r;
+
+ mutex_lock(&td->lock);
+ r = td->rotate;
+ mutex_unlock(&td->lock);
+
+ return r;
}
static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
@@ -915,6 +987,7 @@ static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
dev_dbg(&dssdev->dev, "mirror %d\n", enable);
+ mutex_lock(&td->lock);
dsi_bus_lock();
if (td->enabled) {
r = taal_set_addr_mode(td->rotate, enable);
@@ -925,23 +998,33 @@ static int taal_mirror(struct omap_dss_device *dssdev, bool enable)
td->mirror = enable;
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return 0;
err:
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return r;
}
static bool taal_get_mirror(struct omap_dss_device *dssdev)
{
struct taal_data *td = dev_get_drvdata(&dssdev->dev);
- return td->mirror;
+ int r;
+
+ mutex_lock(&td->lock);
+ r = td->mirror;
+ mutex_unlock(&td->lock);
+
+ return r;
}
static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
{
+ struct taal_data *td = dev_get_drvdata(&dssdev->dev);
u8 id1, id2, id3;
int r;
+ mutex_lock(&td->lock);
dsi_bus_lock();
r = taal_dcs_read_1(DCS_GET_ID1, &id1);
@@ -955,9 +1038,11 @@ static int taal_run_test(struct omap_dss_device *dssdev, int test_num)
goto err;
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return 0;
err:
dsi_bus_unlock();
+ mutex_unlock(&td->lock);
return r;
}
@@ -971,12 +1056,16 @@ static int taal_memory_read(struct omap_dss_device *dssdev,
unsigned buf_used = 0;
struct taal_data *td = dev_get_drvdata(&dssdev->dev);
- if (!td->enabled)
- return -ENODEV;
-
if (size < w * h * 3)
return -ENOMEM;
+ mutex_lock(&td->lock);
+
+ if (!td->enabled) {
+ r = -ENODEV;
+ goto err1;
+ }
+
size = min(w * h * 3,
dssdev->panel.timings.x_res *
dssdev->panel.timings.y_res * 3);
@@ -995,7 +1084,7 @@ static int taal_memory_read(struct omap_dss_device *dssdev,
r = dsi_vc_set_max_rx_packet_size(TCH, plen);
if (r)
- goto err0;
+ goto err2;
while (buf_used < size) {
u8 dcs_cmd = first ? 0x2e : 0x3e;
@@ -1006,7 +1095,7 @@ static int taal_memory_read(struct omap_dss_device *dssdev,
if (r < 0) {
dev_err(&dssdev->dev, "read error\n");
- goto err;
+ goto err3;
}
buf_used += r;
@@ -1020,16 +1109,18 @@ static int taal_memory_read(struct omap_dss_device *dssdev,
dev_err(&dssdev->dev, "signal pending, "
"aborting memory read\n");
r = -ERESTARTSYS;
- goto err;
+ goto err3;
}
}
r = buf_used;
-err:
+err3:
dsi_vc_set_max_rx_packet_size(TCH, 1);
-err0:
+err2:
dsi_bus_unlock();
+err1:
+ mutex_unlock(&td->lock);
return r;
}
@@ -1041,8 +1132,12 @@ static void taal_esd_work(struct work_struct *work)
u8 state1, state2;
int r;
- if (!td->enabled)
+ mutex_lock(&td->lock);
+
+ if (!td->enabled) {
+ mutex_unlock(&td->lock);
return;
+ }
dsi_bus_lock();
@@ -1084,16 +1179,19 @@ static void taal_esd_work(struct work_struct *work)
queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
+ mutex_unlock(&td->lock);
return;
err:
dev_err(&dssdev->dev, "performing LCD reset\n");
- taal_disable(dssdev);
- taal_enable(dssdev);
+ taal_power_off(dssdev);
+ taal_power_on(dssdev);
dsi_bus_unlock();
queue_delayed_work(td->esd_wq, &td->esd_work, TAAL_ESD_CHECK_PERIOD);
+
+ mutex_unlock(&td->lock);
}
static int taal_set_update_mode(struct omap_dss_device *dssdev,
--
1.7.0.4
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