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Message-ID: <2ecdfff5-501a-452f-af90-0806f463a51c@xs4all.nl>
Date:   Wed, 22 Nov 2023 16:44:24 +0100
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Subject: Re: [Patch v4 09/11] media: s5p-mfc: Load firmware for each run in
 MFCv12.
Content-Language: en-US, nl
To:     Aakarsh Jain <aakarsh.jain@samsung.com>,
        linux-arm-kernel@lists.infradead.org, linux-media@vger.kernel.org,
        linux-kernel@vger.kernel.org, devicetree@vger.kernel.org
Cc:     m.szyprowski@samsung.com, andrzej.hajda@intel.com,
        mchehab@kernel.org, krzysztof.kozlowski+dt@linaro.org,
        dillon.minfei@gmail.com, david.plowman@raspberrypi.com,
        mark.rutland@arm.com, robh+dt@kernel.org, conor+dt@kernel.org,
        linux-samsung-soc@vger.kernel.org, andi@etezian.org,
        gost.dev@samsung.com, alim.akhtar@samsung.com,
        aswani.reddy@samsung.com, pankaj.dubey@samsung.com,
        ajaykumar.rs@samsung.com, linux-fsd@tesla.com,
        Smitha T Murthy <smithatmurthy@gmail.com>
References: <20231025102216.50480-1-aakarsh.jain@samsung.com>
 <CGME20231025102300epcas5p2c266a078b70614dc948b0e47cd5cf788@epcas5p2.samsung.com>
 <20231025102216.50480-10-aakarsh.jain@samsung.com>
From:   Hans Verkuil <hverkuil-cisco@xs4all.nl>
In-Reply-To: <20231025102216.50480-10-aakarsh.jain@samsung.com>
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Precedence: bulk

On 25/10/2023 12:22, Aakarsh Jain wrote:
> In MFCv12, some section of firmware gets updated at each MFC run.
> Hence we need to reload original firmware for each run at the start.

Huh? This is very weird. This definitely deserves a comment in the actual
code rather than just the commit log.

Do you know what is going on? What part is updated? Are you sure it isn't
a driver bug somehow?

Regards,

	Hans

> 
> Cc: linux-fsd@tesla.com
> Signed-off-by: Smitha T Murthy <smithatmurthy@gmail.com>
> Signed-off-by: Aakarsh Jain <aakarsh.jain@samsung.com>
> ---
>  drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
> index b49159142c53..057088b9d327 100644
> --- a/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
> +++ b/drivers/media/platform/samsung/s5p-mfc/s5p_mfc_ctrl.c
> @@ -51,8 +51,9 @@ int s5p_mfc_load_firmware(struct s5p_mfc_dev *dev)
>  	 * into kernel. */
>  	mfc_debug_enter();
>  
> -	if (dev->fw_get_done)
> -		return 0;
> +	if (!IS_MFCV12(dev))
> +		if (dev->fw_get_done)
> +			return 0;
>  
>  	for (i = MFC_FW_MAX_VERSIONS - 1; i >= 0; i--) {
>  		if (!dev->variant->fw_name[i])