linux-kernel - Re: [PATCH v2] media: venus: vdec: restrict EOS addr quirk to IRIS2 only

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Message-ID: <wq7kaelokxqxkxxi5cvp7sz2az5hlam4nyyt4v55zrgei3jsyo@yyefysdsw3co>
Date: Wed, 26 Nov 2025 03:13:00 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>
To: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
Cc: Vikash Garodia <vikash.garodia@....qualcomm.com>,
        Bryan O'Donoghue <bod@...nel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Viswanath Boma <quic_vboma@...cinc.com>,
        Stanimir Varbanov <stanimir.k.varbanov@...il.com>,
        Konrad Dybcio <konradybcio@...nel.org>, linux-media@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Mecid <mecid@...omediagroup.de>,
        Renjiang Han <renjiang.han@....qualcomm.com>
Subject: Re: [PATCH v2] media: venus: vdec: restrict EOS addr quirk to IRIS2
 only

On Tue, Nov 25, 2025 at 11:04:19AM +0530, Dikshita Agarwal wrote:
> On SM8250 (IRIS2) with firmware older than 1.0.087, the firmware could

Hmm, interesting. In linux-firmware we have VIDEO.IR.1.0-00005-PROD-4
for SM8250 firmware. This version wouldn't be parsed at all for SM8250
(nor does it follow the format string). Why? Would you please fix
version parsing for this firmware?

> not handle a dummy device address for EOS buffers, so a NULL device
> address is sent instead. The existing check used IS_V6() alongside a
> firmware version gate:
> 
>     if (IS_V6(core) && is_fw_rev_or_older(core, 1, 0, 87))
>         fdata.device_addr = 0;
>     else
> 	fdata.device_addr = 0xdeadb000;
> 
> However, SC7280 which is also V6, uses a firmware string of the form
> "1.0.<commit-hash>", which the version parser translates to 1.0.0. This

I still think that using commit-hash is a mistake. It doesn't allow any
version checks.

> unintentionally satisfies the `is_fw_rev_or_older(..., 1, 0, 87)`
> condition on SC7280. Combined with IS_V6() matching there as well, the
> quirk is incorrectly applied to SC7280, causing VP9 decode failures.
> 
> Constrain the check to IRIS2 (SM8250) only, which is the only platform
> that needed this quirk, by replacing IS_V6() with IS_IRIS2(). This
> restores correct behavior on SC7280 (no forced NULL EOS buffer address).
> 
> Fixes: 47f867cb1b63 ("media: venus: fix EOS handling in decoder stop command")
> Cc: stable@...r.kernel.org
> Reported-by: Mecid <mecid@...omediagroup.de>
> Closes: https://github.com/qualcomm-linux/kernel-topics/issues/222
> Co-developed-by: Renjiang Han <renjiang.han@....qualcomm.com>
> Signed-off-by: Renjiang Han <renjiang.han@....qualcomm.com>
> Signed-off-by: Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> ---
> Changes in v2:
> - Fixed email address for Mecid (Konrad)
> - Added inline comment for the quirk (Konrad)
> - Link to v1: https://lore.kernel.org/r/20251124-venus-vp9-fix-v1-1-2ff36d9f2374@oss.qualcomm.com
> ---
>  drivers/media/platform/qcom/venus/vdec.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c
> index 4a6641fdffcf79705893be58c7ec5cf485e2fab9..6b3d5e59133e6902353d15c24c8bbaed4fcb6808 100644
> --- a/drivers/media/platform/qcom/venus/vdec.c
> +++ b/drivers/media/platform/qcom/venus/vdec.c
> @@ -565,7 +565,13 @@ vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
>  
>  		fdata.buffer_type = HFI_BUFFER_INPUT;
>  		fdata.flags |= HFI_BUFFERFLAG_EOS;
> -		if (IS_V6(inst->core) && is_fw_rev_or_older(inst->core, 1, 0, 87))
> +
> +		/* Send NULL EOS addr for only IRIS2 (SM8250),for firmware <= 1.0.87.
> +		 * SC7280 also reports "1.0.<hash>" parsed as 1.0.0; restricting to IRIS2
> +		 * avoids misapplying this quirk and breaking VP9 decode on SC7280.
> +		 */
> +
> +		if (IS_IRIS2(inst->core) && is_fw_rev_or_older(inst->core, 1, 0, 87))
>  			fdata.device_addr = 0;
>  		else
>  			fdata.device_addr = 0xdeadb000;
> 
> ---
> base-commit: 1f2353f5a1af995efbf7bea44341aa0d03460b28
> change-id: 20251121-venus-vp9-fix-1ff602724c02
> 
> Best regards,
> -- 
> Dikshita Agarwal <dikshita.agarwal@....qualcomm.com>
> 

-- 
With best wishes
Dmitry