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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>
This commit is contained in:
Archit Taneja 2012-07-05 12:52:46 +05:30
parent 27dfddc7fe
commit c8a5e4e86d
1 changed files with 24 additions and 2 deletions
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26
drivers/video/omap2/dss/dpi.c
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@ -39,6 +39,8 @@ static struct {
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 omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
{
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 @@ int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
if (r)
goto err_mgr_enable;
mutex_unlock(&dpi.lock);
return 0;
err_mgr_enable:
@ -234,12 +242,17 @@ int omapdss_dpi_display_enable(struct omap_dss_device *dssdev)
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 @@ void omapdss_dpi_display_disable(struct omap_dss_device *dssdev)
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 @@ void dpi_set_timings(struct omap_dss_device *dssdev,
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 @@ void dpi_set_timings(struct omap_dss_device *dssdev,
} else {
dss_mgr_set_timings(dssdev->manager, timings);
}
mutex_unlock(&dpi.lock);
}
EXPORT_SYMBOL(dpi_set_timings);
@ -377,6 +397,8 @@ static void __init dpi_probe_pdata(struct platform_device *pdev)
static int __init omap_dpi_probe(struct platform_device *pdev)
{
mutex_init(&dpi.lock);
dpi_probe_pdata(pdev);
return 0;