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authorArchit Taneja <archit@ti.com>2014-03-13 17:14:04 +0530
committerKamil Debski <k.debski@samsung.com>2014-05-14 15:53:33 +0200
commit8eee3093d505a1e1552cbb75a6cd717621ed13a4 (patch)
treee9174ced3bcac3854b3a4db51b4e5637b5f9935f
parentba0d342ecc21fbbe2f6c178f4479944d1fb34f3b (diff)
v4l: ti-vpe: register video device only when firmware is loaded
vpe fops(vpe_open in particular) should be called only when VPDMA firmware is loaded. File operations on the video device are possible the moment it is registered. Currently, we register the video device for VPE at driver probe, after calling a vpdma helper to initialize VPDMA and load firmware. This function is non-blocking(it calls request_firmware_nowait()), and doesn't ensure that the firmware is actually loaded when it returns. We remove the device registration from vpe probe, and move it to a callback provided by the vpe driver to the vpdma library, through vpdma_create(). The ready field in vpdma_data is no longer needed since we always have firmware loaded before the device is registered. A minor problem with this approach is that if the video_register_device fails(which doesn't really happen), the vpe platform device would be registered. however, there won't be any v4l2 device corresponding to it. Signed-off-by: Archit Taneja <archit@ti.com> Signed-off-by: Kamil Debski <k.debski@samsung.com>
-rw-r--r--drivers/media/platform/ti-vpe/vpdma.c8
-rw-r--r--drivers/media/platform/ti-vpe/vpdma.h7
-rw-r--r--drivers/media/platform/ti-vpe/vpe.c55
3 files changed, 41 insertions, 29 deletions
diff --git a/drivers/media/platform/ti-vpe/vpdma.c b/drivers/media/platform/ti-vpe/vpdma.c
index e8175e7938ed..73dd38eab582 100644
--- a/drivers/media/platform/ti-vpe/vpdma.c
+++ b/drivers/media/platform/ti-vpe/vpdma.c
@@ -781,7 +781,7 @@ static void vpdma_firmware_cb(const struct firmware *f, void *context)
/* already initialized */
if (read_field_reg(vpdma, VPDMA_LIST_ATTR, VPDMA_LIST_RDY_MASK,
VPDMA_LIST_RDY_SHFT)) {
- vpdma->ready = true;
+ vpdma->cb(vpdma->pdev);
return;
}
@@ -811,7 +811,7 @@ static void vpdma_firmware_cb(const struct firmware *f, void *context)
goto free_buf;
}
- vpdma->ready = true;
+ vpdma->cb(vpdma->pdev);
free_buf:
vpdma_unmap_desc_buf(vpdma, &fw_dma_buf);
@@ -839,7 +839,8 @@ static int vpdma_load_firmware(struct vpdma_data *vpdma)
return 0;
}
-struct vpdma_data *vpdma_create(struct platform_device *pdev)
+struct vpdma_data *vpdma_create(struct platform_device *pdev,
+ void (*cb)(struct platform_device *pdev))
{
struct resource *res;
struct vpdma_data *vpdma;
@@ -854,6 +855,7 @@ struct vpdma_data *vpdma_create(struct platform_device *pdev)
}
vpdma->pdev = pdev;
+ vpdma->cb = cb;
res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "vpdma");
if (res == NULL) {
diff --git a/drivers/media/platform/ti-vpe/vpdma.h b/drivers/media/platform/ti-vpe/vpdma.h
index cf40f11b3c8f..bf5f8bbcf917 100644
--- a/drivers/media/platform/ti-vpe/vpdma.h
+++ b/drivers/media/platform/ti-vpe/vpdma.h
@@ -35,8 +35,8 @@ struct vpdma_data {
struct platform_device *pdev;
- /* tells whether vpdma firmware is loaded or not */
- bool ready;
+ /* callback to VPE driver when the firmware is loaded */
+ void (*cb)(struct platform_device *pdev);
};
enum vpdma_data_format_type {
@@ -208,6 +208,7 @@ void vpdma_set_frame_start_event(struct vpdma_data *vpdma,
void vpdma_dump_regs(struct vpdma_data *vpdma);
/* initialize vpdma, passed with VPE's platform device pointer */
-struct vpdma_data *vpdma_create(struct platform_device *pdev);
+struct vpdma_data *vpdma_create(struct platform_device *pdev,
+ void (*cb)(struct platform_device *pdev));
#endif
diff --git a/drivers/media/platform/ti-vpe/vpe.c b/drivers/media/platform/ti-vpe/vpe.c
index 5c421886d97c..d90ad2bed2fa 100644
--- a/drivers/media/platform/ti-vpe/vpe.c
+++ b/drivers/media/platform/ti-vpe/vpe.c
@@ -1831,11 +1831,6 @@ static int vpe_open(struct file *file)
vpe_dbg(dev, "vpe_open\n");
- if (!dev->vpdma->ready) {
- vpe_err(dev, "vpdma firmware not loaded\n");
- return -ENODEV;
- }
-
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
@@ -2055,10 +2050,40 @@ static void vpe_runtime_put(struct platform_device *pdev)
WARN_ON(r < 0 && r != -ENOSYS);
}
+static void vpe_fw_cb(struct platform_device *pdev)
+{
+ struct vpe_dev *dev = platform_get_drvdata(pdev);
+ struct video_device *vfd;
+ int ret;
+
+ vfd = &dev->vfd;
+ *vfd = vpe_videodev;
+ vfd->lock = &dev->dev_mutex;
+ vfd->v4l2_dev = &dev->v4l2_dev;
+
+ ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
+ if (ret) {
+ vpe_err(dev, "Failed to register video device\n");
+
+ vpe_set_clock_enable(dev, 0);
+ vpe_runtime_put(pdev);
+ pm_runtime_disable(&pdev->dev);
+ v4l2_m2m_release(dev->m2m_dev);
+ vb2_dma_contig_cleanup_ctx(dev->alloc_ctx);
+ v4l2_device_unregister(&dev->v4l2_dev);
+
+ return;
+ }
+
+ video_set_drvdata(vfd, dev);
+ snprintf(vfd->name, sizeof(vfd->name), "%s", vpe_videodev.name);
+ dev_info(dev->v4l2_dev.dev, "Device registered as /dev/video%d\n",
+ vfd->num);
+}
+
static int vpe_probe(struct platform_device *pdev)
{
struct vpe_dev *dev;
- struct video_device *vfd;
int ret, irq, func;
dev = devm_kzalloc(&pdev->dev, sizeof(*dev), GFP_KERNEL);
@@ -2139,28 +2164,12 @@ static int vpe_probe(struct platform_device *pdev)
goto runtime_put;
}
- dev->vpdma = vpdma_create(pdev);
+ dev->vpdma = vpdma_create(pdev, vpe_fw_cb);
if (IS_ERR(dev->vpdma)) {
ret = PTR_ERR(dev->vpdma);
goto runtime_put;
}
- vfd = &dev->vfd;
- *vfd = vpe_videodev;
- vfd->lock = &dev->dev_mutex;
- vfd->v4l2_dev = &dev->v4l2_dev;
-
- ret = video_register_device(vfd, VFL_TYPE_GRABBER, 0);
- if (ret) {
- vpe_err(dev, "Failed to register video device\n");
- goto runtime_put;
- }
-
- video_set_drvdata(vfd, dev);
- snprintf(vfd->name, sizeof(vfd->name), "%s", vpe_videodev.name);
- dev_info(dev->v4l2_dev.dev, "Device registered as /dev/video%d\n",
- vfd->num);
-
return 0;
runtime_put:

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