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drm/mali-dp: Add core_id file to the sysfs interface

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Add a core_id file in the driver's sysfs directory,
exposing the hardware CORE ID. This is useful to allow
userspace to discover the hardware version used.

Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
This commit is contained in:
Liviu Dudau 2017-04-05 11:55:26 +01:00
parent 6954f24588
commit 50c7512fd7
2 changed files with 36 additions and 0 deletions
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35
drivers/gpu/drm/arm/malidp_drv.c
View File

@ -371,6 +371,32 @@ static bool malidp_has_sufficient_address_space(const struct resource *res,
return true;
}
static ssize_t core_id_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct drm_device *drm = dev_get_drvdata(dev);
struct malidp_drm *malidp = drm->dev_private;
return snprintf(buf, PAGE_SIZE, "%08x\n", malidp->core_id);
}
DEVICE_ATTR_RO(core_id);
static int malidp_init_sysfs(struct device *dev)
{
int ret = device_create_file(dev, &dev_attr_core_id);
if (ret)
DRM_ERROR("failed to create device file for core_id\n");
return ret;
}
static void malidp_fini_sysfs(struct device *dev)
{
device_remove_file(dev, &dev_attr_core_id);
}
#define MAX_OUTPUT_CHANNELS 3
static int malidp_runtime_pm_suspend(struct device *dev)
@ -503,6 +529,8 @@ static int malidp_bind(struct device *dev)
DRM_INFO("found ARM Mali-DP%3x version r%dp%d\n", version >> 16,
(version >> 12) & 0xf, (version >> 8) & 0xf);
malidp->core_id = version;
/* set the number of lines used for output of RGB data */
ret = of_property_read_u8_array(dev->of_node,
"arm,malidp-output-port-lines",
@ -521,6 +549,10 @@ static int malidp_bind(struct device *dev)
if (ret < 0)
goto query_hw_fail;
ret = malidp_init_sysfs(dev);
if (ret)
goto init_fail;
/* Set the CRTC's port so that the encoder component can find it */
malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
@ -580,6 +612,8 @@ irq_init_fail:
bind_fail:
of_node_put(malidp->crtc.port);
malidp->crtc.port = NULL;
init_fail:
malidp_fini_sysfs(dev);
malidp_fini(drm);
query_hw_fail:
pm_runtime_put(dev);
@ -614,6 +648,7 @@ static void malidp_unbind(struct device *dev)
component_unbind_all(dev, drm);
of_node_put(malidp->crtc.port);
malidp->crtc.port = NULL;
malidp_fini_sysfs(dev);
malidp_fini(drm);
pm_runtime_put(dev);
if (pm_runtime_enabled(dev))

1
drivers/gpu/drm/arm/malidp_drv.h
View File

@ -25,6 +25,7 @@ struct malidp_drm {
wait_queue_head_t wq;
atomic_t config_valid;
struct drm_atomic_state *pm_state;
u32 core_id;
};
#define crtc_to_malidp_device(x) container_of(x, struct malidp_drm, crtc)