linux-kernel - Re: [PATCH 15/17] drm/msm/a6xx: Make crashstate capture IFPC safe

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Message-ID: <d50f9a01-ba8f-44ec-9206-fcef641333aa@oss.qualcomm.com>
Date: Wed, 23 Jul 2025 12:32:37 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Akhil P Oommen <akhilpo@....qualcomm.com>,
        Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 15/17] drm/msm/a6xx: Make crashstate capture IFPC safe

On 7/20/25 2:16 PM, Akhil P Oommen wrote:
> Now with IFPC, GX domain can collapse as soon as GPU becomes IDLE. So
> add gx_is_on check before accessing any GX registers during crashstate
> capture and recovery.
> 
> Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
> ---

[...]

> +	/*
> +	 * This is true only on an A6XX_GEN1 with GMU, has IFPC enabled and a super old SQE firmware
> +	 * without 'whereami' support
> +	 */

Firmware that old won't even be accepted by the driver, see the slightly
confusing logic in a6xx_ucode_check_version()

Konrad