linux-kernel - Re: [PATCH 1/4] soc: qcom: mdt_loader: Add check to make scm calls

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Date:   Fri, 18 May 2018 12:48:44 +0530
From:   Vikash Garodia <vgarodia@...eaurora.org>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     hverkuil@...all.nl, mchehab@...nel.org, andy.gross@...aro.org,
        stanimir.varbanov@...aro.org, linux-media@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, acourbot@...gle.com,
        linux-media-owner@...r.kernel.org
Subject: Re: [PATCH 1/4] soc: qcom: mdt_loader: Add check to make scm calls

Hi Bjorn,

On 2018-05-18 10:58, Bjorn Andersson wrote:
> On Thu 17 May 04:32 PDT 2018, Vikash Garodia wrote:
> 
>> In order to invoke scm calls, ensure that the platform
>> has the required support to invoke the scm calls in
>> secure world.
>> 
>> Signed-off-by: Vikash Garodia <vgarodia@...eaurora.org>
>> ---
>>  drivers/soc/qcom/mdt_loader.c | 21 +++++++++++++--------
>>  1 file changed, 13 insertions(+), 8 deletions(-)
>> 
>> diff --git a/drivers/soc/qcom/mdt_loader.c 
>> b/drivers/soc/qcom/mdt_loader.c
>> index 17b314d..db55d53 100644
>> --- a/drivers/soc/qcom/mdt_loader.c
>> +++ b/drivers/soc/qcom/mdt_loader.c
>> @@ -121,10 +121,12 @@ int qcom_mdt_load(struct device *dev, const 
>> struct firmware *fw,
>>  	if (!fw_name)
>>  		return -ENOMEM;
>> 
>> -	ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
>> -	if (ret) {
>> -		dev_err(dev, "invalid firmware metadata\n");
>> -		goto out;
>> +	if (qcom_scm_is_available()) {
> 
> qcom_scm_is_available() tells you if the qcom_scm driver has been
> probed, not if your platform implements PAS.
> 
> Please add a DT property to tell the driver if it should require PAS or
> not (the absence of such property should indicate PAS is required, for
> backwards compatibility purposes). For the MDT loader we need to merge
> the following patch to make this work:
> 
> https://patchwork.kernel.org/patch/10397889/

Thanks for your inputs. I have already added a child node in video DT 
node
to tell the driver if PAS is not needed.
I will drop this patch as use 
https://patchwork.kernel.org/patch/10397889
and update the driver to call new api qcom_mdt_load_no_init.

> Regards,
> Bjorn