linux-kernel - Re: [PATCH v4 02/17] media: venus: hfi_venus: Write to VIDC_CTRL

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Message-ID: <41e006ed-0f91-70dc-075d-c505c21ef95a@quicinc.com>
Date:   Thu, 1 Jun 2023 14:39:18 +0530
From:   Vikash Garodia <quic_vgarodia@...cinc.com>
To:     Konrad Dybcio <konrad.dybcio@...aro.org>,
        Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Andy Gross <agross@...nel.org>,
        "Bjorn Andersson" <andersson@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Dikshita Agarwal <dikshita@....qualcomm.com>,
        Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
        Mansur Alisha Shaik <mansur@...eaurora.org>,
        Jonathan Marek <jonathan@...ek.ca>,
        Hans Verkuil <hans.verkuil@...co.com>,
        Dikshita Agarwal <quic_dikshita@...cinc.com>
CC:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        <linux-media@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        "Marijn Suijten" <marijn.suijten@...ainline.org>,
        <stable@...r.kernel.org>
Subject: Re: [PATCH v4 02/17] media: venus: hfi_venus: Write to VIDC_CTRL_INIT
 after unmasking interrupts

On 5/30/2023 6:00 PM, Konrad Dybcio wrote:
> The startup procedure shouldn't be started with interrupts masked, as that
> may entail silent failures.
> 
> Kick off initialization only after the interrupts are unmasked.
> 
> Cc: stable@...r.kernel.org # v4.12+
> Fixes: d96d3f30c0f2 ("[media] media: venus: hfi: add Venus HFI files")
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

Reviewed-by: Vikash Garodia <quic_vgarodia@...cinc.com>

> ---
>  drivers/media/platform/qcom/venus/hfi_venus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/hfi_venus.c b/drivers/media/platform/qcom/venus/hfi_venus.c
> index 918a283bd890..5506a0d196ef 100644
> --- a/drivers/media/platform/qcom/venus/hfi_venus.c
> +++ b/drivers/media/platform/qcom/venus/hfi_venus.c
> @@ -453,7 +453,6 @@ static int venus_boot_core(struct venus_hfi_device *hdev)
>  	void __iomem *wrapper_base = hdev->core->wrapper_base;
>  	int ret = 0;
>  
> -	writel(BIT(VIDC_CTRL_INIT_CTRL_SHIFT), cpu_cs_base + VIDC_CTRL_INIT);
>  	if (IS_V6(hdev->core)) {
>  		mask_val = readl(wrapper_base + WRAPPER_INTR_MASK);
>  		mask_val &= ~(WRAPPER_INTR_MASK_A2HWD_BASK_V6 |
> @@ -464,6 +463,7 @@ static int venus_boot_core(struct venus_hfi_device *hdev)
>  	writel(mask_val, wrapper_base + WRAPPER_INTR_MASK);
>  	writel(1, cpu_cs_base + CPU_CS_SCIACMDARG3);
>  
> +	writel(BIT(VIDC_CTRL_INIT_CTRL_SHIFT), cpu_cs_base + VIDC_CTRL_INIT);
>  	while (!ctrl_status && count < max_tries) {
>  		ctrl_status = readl(cpu_cs_base + CPU_CS_SCIACMDARG0);
>  		if ((ctrl_status & CPU_CS_SCIACMDARG0_ERROR_STATUS_MASK) == 4) {
>