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drm/tilcdc fixing i2c/slave initialization race

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In certain senarios drm will initialize before i2c this means that i2c
slave devices like the nxp tda998x will fail to be probed.  This patch
detects this condition then defers the probe of the slave device and
the tilcdc main driver.

Signed-off-by: Darren Etheridge <detheridge@ti.com>
Acked-by: Rob Clark <robdclark@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Darren Etheridge
2013-06-21 13:52:27 -05:00
committed by Dave Airlie
parent f7b4575601
commit 39de619413
3 changed files with 40 additions and 25 deletions
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10
drivers/gpu/drm/tilcdc/tilcdc_drv.c
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@@ -26,6 +26,7 @@
#include "drm_fb_helper.h"
static LIST_HEAD(module_list);
static bool slave_probing;
void tilcdc_module_init(struct tilcdc_module *mod, const char *name,
const struct tilcdc_module_ops *funcs)
@@ -41,6 +42,11 @@ void tilcdc_module_cleanup(struct tilcdc_module *mod)
list_del(&mod->list);
}
void tilcdc_slave_probedefer(bool defered)
{
slave_probing = defered;
}
static struct of_device_id tilcdc_of_match[];
static struct drm_framebuffer *tilcdc_fb_create(struct drm_device *dev,
@@ -580,6 +586,10 @@ static int tilcdc_pdev_probe(struct platform_device *pdev)
return -ENXIO;
}
/* defer probing if slave is in deferred probing */
if (slave_probing == true)
return -EPROBE_DEFER;
return drm_platform_init(&tilcdc_driver, pdev);
}