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Commit c8a5e4e8 authored by Archit Taneja's avatar Archit Taneja
Browse files

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: default avatarArchit Taneja <archit@ti.com>
parent 27dfddc7

drivers/video/omap2/dss/dpi.c

+24 −2
Original line number Diff line number Diff line
@@ -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;