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authorLiviu Dudau <Liviu.Dudau@arm.com>2017-04-05 11:55:26 +0100
committerLiviu Dudau <Liviu.Dudau@arm.com>2017-04-24 10:45:34 +0100
commit50c7512fd7496129d774ccabf32537e9a45be186 (patch)
treed1a834196124f4d01afea95e9cec24f61491dcab /drivers/gpu/drm
parent6954f24588ebddc2e3c840103f02d1fe7e65a2d6 (diff)
drm/mali-dp: Add core_id file to the sysfs interface
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>
Diffstat (limited to 'drivers/gpu/drm')
-rw-r--r--drivers/gpu/drm/arm/malidp_drv.c35
-rw-r--r--drivers/gpu/drm/arm/malidp_drv.h1
2 files changed, 36 insertions, 0 deletions
diff --git a/drivers/gpu/drm/arm/malidp_drv.c b/drivers/gpu/drm/arm/malidp_drv.c
index eae41e26b819..24bc96f9e91c 100644
--- a/drivers/gpu/drm/arm/malidp_drv.c
+++ b/drivers/gpu/drm/arm/malidp_drv.c
@@ -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))
diff --git a/drivers/gpu/drm/arm/malidp_drv.h b/drivers/gpu/drm/arm/malidp_drv.h
index e1c784dcdd92..75070efda2fc 100644
--- a/drivers/gpu/drm/arm/malidp_drv.h
+++ b/drivers/gpu/drm/arm/malidp_drv.h
@@ -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)