Re: [PATCH v8 05/10] media: venus: adding core part and helper functions

Bjorn Andersson
2017-04-29T20:22:51Z

On Fri 28 Apr 15:02 PDT 2017, Jordan Crouse wrote:

> On Fri, Apr 28, 2017 at 12:13:52PM +0300, Stanimir Varbanov wrote:
> > +int venus_boot(struct device *parent, struct device *fw_dev)
> > +{
> > + const struct firmware *mdt;
> > + phys_addr_t mem_phys;
> > + ssize_t fw_size;
> > + size_t mem_size;
> > + void *mem_va;
> > + int ret;
> > +
> > + if (!qcom_scm_is_available())
> > + return -EPROBE_DEFER;
> > +
> > + fw_dev->parent = parent;
> > + fw_dev->release = device_release_dummy;
> > +
> > + ret = dev_set_name(fw_dev, "%s:%s", dev_name(parent), "firmware");
> > + if (ret)
> > + return ret;
> > +
> > + ret = device_register(fw_dev);
> > + if (ret < 0)
> > + return ret;
> > +
> > + ret = of_reserved_mem_device_init_by_idx(fw_dev, parent->of_node, 0);
> > + if (ret)
> > + goto err_unreg_device;
> > +
> > + mem_size = VENUS_FW_MEM_SIZE;
> > +
> > + mem_va = dmam_alloc_coherent(fw_dev, mem_size, &mem_phys, GFP_KERNEL);
> > + if (!mem_va) {
> > + ret = -ENOMEM;
> > + goto err_unreg_device;
> > + }
> > +
> > + ret = request_firmware(&mdt, VENUS_FIRMWARE_NAME, fw_dev);
> > + if (ret < 0)
> > + goto err_unreg_device;
> > +
> > + fw_size = qcom_mdt_get_size(mdt);
> > + if (fw_size < 0) {
> > + ret = fw_size;
> > + release_firmware(mdt);
> > + goto err_unreg_device;
> > + }
> > +
> > + ret = qcom_mdt_load(fw_dev, mdt, VENUS_FIRMWARE_NAME, VENUS_PAS_ID,
> > + mem_va, mem_phys, mem_size);
> > +
> > + release_firmware(mdt);
> > +
> > + if (ret)
> > + goto err_unreg_device;
> > +
> > + ret = qcom_scm_pas_auth_and_reset(VENUS_PAS_ID);
> > + if (ret)
> > + goto err_unreg_device;
> > +
> > + return 0;
> > +
> > +err_unreg_device:
> > + device_unregister(fw_dev);
> > + return ret;
> > +}
>
> Hey, this looks familiar - almost line for line identical to what we'll need to
> do for GPU.
>
> Bjorn - Is this enough to qualify for generic status in the mdt_loader code?
> I know its just two consumers, but it would save 50 or 60 lines of code between
> the two drivers and be easier to maintain.
>

I think the code setting up the struct device for memory allocation
should be done during probe of the parent, so that I don't think should
be shared.

The part that allocates memory from a device, loads the mdt into that
memory and calls auth_and_reset() sounds like a useful thing to move to
the mdt_loader.c

Regards,
Bjorn