OMAPDSS: DPI: Add locking for DPI interface
The DPI interface driver currently relies on the panel driver to ensure calls
like omapdss_dpi_display_enable() and omapdss_dpi_display_disable() are executed
sequentially. Also, currently, there is no way to protect the DPI driver data.
All DPI panel drivers don't ensure this, and in general, a DPI panel driver
should use it's lock to that ensure it's own driver data and omap_dss_device
states are taken care of, and not worry about the DPI interface.
Add mutex locking in the DPI enable/disable/set_timings ops.
Signed-off-by: Archit Taneja <archit@ti.com>
diff --git a/drivers/video/omap2/dss/dpi.c b/drivers/video/omap2/dss/dpi.c
index 3266be2..15c2c33 100644
--- a/drivers/video/omap2/dss/dpi.c
+++ b/drivers/video/omap2/dss/dpi.c
@@ -39,6 +39,8 @@
struct regulator *vdds_dsi_reg;
struct platform_device *dsidev;
+ struct mutex lock;
+
struct dss_lcd_mgr_config mgr_config;
} dpi;
@@ -169,14 +171,18 @@
{
int r;
+ mutex_lock(&dpi.lock);
+
if (cpu_is_omap34xx() && !dpi.vdds_dsi_reg) {
DSSERR("no VDSS_DSI regulator\n");
- return -ENODEV;
+ r = -ENODEV;
+ goto err_no_reg;
}
if (dssdev->manager == NULL) {
DSSERR("failed to enable display: no manager\n");
- return -ENODEV;
+ r = -ENODEV;
+ goto err_no_mgr;
}
r = omap_dss_start_device(dssdev);
@@ -217,6 +223,8 @@
if (r)
goto err_mgr_enable;
+ mutex_unlock(&dpi.lock);
+
return 0;
err_mgr_enable:
@@ -234,12 +242,17 @@
err_reg_enable:
omap_dss_stop_device(dssdev);
err_start_dev:
+err_no_mgr:
+err_no_reg:
+ mutex_unlock(&dpi.lock);
return r;
}
EXPORT_SYMBOL(omapdss_dpi_display_enable);
void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
{
+ mutex_lock(&dpi.lock);
+
dss_mgr_disable(dssdev->manager);
if (dpi_use_dsi_pll(dssdev)) {
@@ -254,6 +267,8 @@
regulator_disable(dpi.vdds_dsi_reg);
omap_dss_stop_device(dssdev);
+
+ mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(omapdss_dpi_display_disable);
@@ -263,6 +278,9 @@
int r;
DSSDBG("dpi_set_timings\n");
+
+ mutex_lock(&dpi.lock);
+
dssdev->panel.timings = *timings;
if (dssdev->state == OMAP_DSS_DISPLAY_ACTIVE) {
r = dispc_runtime_get();
@@ -275,6 +293,8 @@
} else {
dss_mgr_set_timings(dssdev->manager, timings);
}
+
+ mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(dpi_set_timings);
@@ -377,6 +397,8 @@
static int __init omap_dpi_probe(struct platform_device *pdev)
{
+ mutex_init(&dpi.lock);
+
dpi_probe_pdata(pdev);
return 0;