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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>
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2 changed files with 36 additions and 0 deletions
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@ -371,6 +371,32 @@ static bool malidp_has_sufficient_address_space(const struct resource *res,
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return true;
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}
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static ssize_t core_id_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct drm_device *drm = dev_get_drvdata(dev);
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struct malidp_drm *malidp = drm->dev_private;
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return snprintf(buf, PAGE_SIZE, "%08x\n", malidp->core_id);
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}
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DEVICE_ATTR_RO(core_id);
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static int malidp_init_sysfs(struct device *dev)
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{
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int ret = device_create_file(dev, &dev_attr_core_id);
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if (ret)
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DRM_ERROR("failed to create device file for core_id\n");
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return ret;
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}
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static void malidp_fini_sysfs(struct device *dev)
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{
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device_remove_file(dev, &dev_attr_core_id);
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}
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#define MAX_OUTPUT_CHANNELS 3
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static int malidp_runtime_pm_suspend(struct device *dev)
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@ -503,6 +529,8 @@ static int malidp_bind(struct device *dev)
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DRM_INFO("found ARM Mali-DP%3x version r%dp%d\n", version >> 16,
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(version >> 12) & 0xf, (version >> 8) & 0xf);
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malidp->core_id = version;
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/* set the number of lines used for output of RGB data */
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ret = of_property_read_u8_array(dev->of_node,
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"arm,malidp-output-port-lines",
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@ -521,6 +549,10 @@ static int malidp_bind(struct device *dev)
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if (ret < 0)
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goto query_hw_fail;
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ret = malidp_init_sysfs(dev);
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if (ret)
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goto init_fail;
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/* Set the CRTC's port so that the encoder component can find it */
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malidp->crtc.port = of_graph_get_port_by_id(dev->of_node, 0);
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@ -580,6 +612,8 @@ static int malidp_bind(struct device *dev)
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bind_fail:
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of_node_put(malidp->crtc.port);
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malidp->crtc.port = NULL;
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init_fail:
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malidp_fini_sysfs(dev);
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malidp_fini(drm);
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query_hw_fail:
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pm_runtime_put(dev);
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@ -614,6 +648,7 @@ static void malidp_unbind(struct device *dev)
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component_unbind_all(dev, drm);
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of_node_put(malidp->crtc.port);
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malidp->crtc.port = NULL;
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malidp_fini_sysfs(dev);
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malidp_fini(drm);
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pm_runtime_put(dev);
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if (pm_runtime_enabled(dev))
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@ -25,6 +25,7 @@ struct malidp_drm {
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wait_queue_head_t wq;
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atomic_t config_valid;
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struct drm_atomic_state *pm_state;
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u32 core_id;
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};
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#define crtc_to_malidp_device(x) container_of(x, struct malidp_drm, crtc)
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