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SubjectRe: [PATCH 4/4] media: venus: add PIL support
From
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Hi,

On 05/22/2018 04:02 PM, Stanimir Varbanov wrote:
> Hi Vikash,
>
> On 05/17/2018 02:32 PM, Vikash Garodia wrote:
>> This adds support to load the video firmware
>> and bring ARM9 out of reset. This is useful
>> for platforms which does not have trustzone
>> to reset the ARM9.
>>
>> Signed-off-by: Vikash Garodia <vgarodia@codeaurora.org>
>> ---
>> .../devicetree/bindings/media/qcom,venus.txt | 8 +-
>> drivers/media/platform/qcom/venus/core.c | 67 +++++++--
>> drivers/media/platform/qcom/venus/core.h | 6 +
>> drivers/media/platform/qcom/venus/firmware.c | 163 +++++++++++++++++----
>> drivers/media/platform/qcom/venus/firmware.h | 10 +-
>> 5 files changed, 217 insertions(+), 37 deletions(-)
>>

<snip>

>>
>> -int venus_shutdown(struct device *dev)
>> +int venus_boot_noTZ(struct venus_core *core, phys_addr_t mem_phys,
>> + size_t mem_size)
>> {
>> - return qcom_scm_pas_shutdown(VENUS_PAS_ID);
>> + struct iommu_domain *iommu;
>> + struct device *dev;
>> + int ret;
>> +
>> + if (!core->fw.dev)
>> + return -EPROBE_DEFER;
>> +
>> + dev = core->fw.dev;
>> +
>> + iommu = iommu_domain_alloc(&platform_bus_type);
>> + if (!iommu) {
>> + dev_err(dev, "Failed to allocate iommu domain\n");
>> + return -ENOMEM;
>> + }
>> +
>> + iommu->geometry.aperture_start = 0x0;
>> + iommu->geometry.aperture_end = VENUS_FW_MEM_SIZE;
>
> The same comment for geometry params as for venus_probe is valid here.

Infact aperture_end will be overwritten by arm-smmu driver in the next
call to iommu_attach_device(), and by chance geometry.force_aperture
will become true.

I wonder is that geometry params are supposed to be used by drivers or
by iommu drivers?

>
>> +
>> + ret = iommu_attach_device(iommu, dev);
>> + if (ret) {
>> + dev_err(dev, "could not attach device\n");
>> + goto err_attach;
>> + }
>> +
>> + ret = iommu_map(iommu, core->fw.iova, mem_phys, mem_size,
>> + IOMMU_READ|IOMMU_WRITE|IOMMU_PRIV);
>
> iova is not initialized and is zero, maybe we don't need that variable
> in the venus_firmware structure?
>
>> + if (ret) {
>> + dev_err(dev, "could not map video firmware region\n");
>> + goto err_map;
>> + }
>> + core->fw.iommu_domain = iommu;
>> + venus_reset_hw(core);
>> +
>> + return 0;
>> +
>> +err_map:
>> + iommu_detach_device(iommu, dev);
>> +err_attach:
>> + iommu_domain_free(iommu);
>> + return ret;
>> }
>> +

<snip>

--
regards,
Stan

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