linux-kernel - Re: [PATCH v6 2/4] venus: firmware: move load firmware in a separate function

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Message-ID: <ee7f8db9-8624-9e08-7ea2-7ea99c0ad289@linaro.org>
Date:   Fri, 24 Aug 2018 12:01:40 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Alexandre Courbot <acourbot@...omium.org>, vgarodia@...eaurora.org
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>, robh@...nel.org,
        mark.rutland@....com, Andy Gross <andy.gross@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, bjorn.andersson@...aro.org,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/4] venus: firmware: move load firmware in a separate
 function

Hi Alex,

On 08/24/2018 10:39 AM, Alexandre Courbot wrote:
> On Thu, Aug 23, 2018 at 11:29 PM Vikash Garodia <vgarodia@...eaurora.org> wrote:
>>
>> Separate firmware loading part into a new function.
>>
>> Signed-off-by: Vikash Garodia <vgarodia@...eaurora.org>
>> ---
>>  drivers/media/platform/qcom/venus/core.c     |  4 +-
>>  drivers/media/platform/qcom/venus/firmware.c | 55 ++++++++++++++++++----------
>>  drivers/media/platform/qcom/venus/firmware.h |  2 +-
>>  3 files changed, 38 insertions(+), 23 deletions(-)
>>
>> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
>> index bb6add9..75b9785 100644
>> --- a/drivers/media/platform/qcom/venus/core.c
>> +++ b/drivers/media/platform/qcom/venus/core.c
>> @@ -84,7 +84,7 @@ static void venus_sys_error_handler(struct work_struct *work)
>>
>>         pm_runtime_get_sync(core->dev);
>>
>> -       ret |= venus_boot(core->dev, core->res->fwname);
>> +       ret |= venus_boot(core);
>>
>>         ret |= hfi_core_resume(core, true);
>>
>> @@ -284,7 +284,7 @@ static int venus_probe(struct platform_device *pdev)
>>         if (ret < 0)
>>                 goto err_runtime_disable;
>>
>> -       ret = venus_boot(dev, core->res->fwname);
>> +       ret = venus_boot(core);
>>         if (ret)
>>                 goto err_runtime_disable;
>>
>> diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
>> index a9d042e..34224eb 100644
>> --- a/drivers/media/platform/qcom/venus/firmware.c
>> +++ b/drivers/media/platform/qcom/venus/firmware.c
>> @@ -60,20 +60,18 @@ int venus_set_hw_state(struct venus_core *core, bool resume)
>>         return 0;
>>  }
>>
>> -int venus_boot(struct device *dev, const char *fwname)
>> +static int venus_load_fw(struct venus_core *core, const char *fwname,
>> +                        phys_addr_t *mem_phys, size_t *mem_size)
> 
> Following the remarks of the previous patch, you would have mem_phys
> and mem_size as members of venus_core (probably renamed as fw_mem_addr
> and fw_mem_size).
> 
>>  {
>>         const struct firmware *mdt;
>>         struct device_node *node;
>> -       phys_addr_t mem_phys;
>> +       struct device *dev;
>>         struct resource r;
>>         ssize_t fw_size;
>> -       size_t mem_size;
>>         void *mem_va;
>>         int ret;
>>
>> -       if (!IS_ENABLED(CONFIG_QCOM_MDT_LOADER) || !qcom_scm_is_available())
>> -               return -EPROBE_DEFER;
> 
> !IS_ENABLED(CONFIG_QCOM_MDT_LOADER) is not a condition that can change
> at runtime, and returning -EPROBE_DEFER in that case seems erroneous
> to me. Instead, wouldn't it make more sense to make the driver depend
> on QCOM_MDT_LOADER?

That was made on purpose, for more info git show b8f9bdc151e4a

-- 
regards,
Stan