linux-kernel - Re: [PATCH RESEND] drm/i915/pch: fix warning for coffeelake on SunrisePoint PCH

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Message-ID: <aBFCcH5T56ZenY-K@intel.com>
Date: Tue, 29 Apr 2025 17:19:44 -0400
From: Rodrigo Vivi <rodrigo.vivi@...el.com>
To: Jiajia Liu <liujiajia@...inos.cn>
CC: Jani Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen
	<joonas.lahtinen@...ux.intel.com>, Tvrtko Ursulin <tursulin@...ulin.net>,
	David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>, "Nemesa
 Garg" <nemesa.garg@...el.com>, Ville Syrjälä
	<ville.syrjala@...ux.intel.com>, Nitin Gote <nitin.r.gote@...el.com>, "Matt
 Roper" <matthew.d.roper@...el.com>, <intel-gfx@...ts.freedesktop.org>,
	<dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND] drm/i915/pch: fix warning for coffeelake on
 SunrisePoint PCH

On Wed, Apr 23, 2025 at 03:37:30PM +0800, Jiajia Liu wrote:
> i915/pch reports a warning on a mini PC which has a CoffeeLake-S GT2
> [UHD Graphics 630] [8086:3e92] and an ISA bridge - H110 LPC Controller
> [8086:a143].
> 
> [5.608723] i915 0000:00:02.0: [drm] Found coffeelake (device ID 3e92) integrated display version 9.00 stepping N/A
> [5.608969] ------------[ cut here ]------------
> [5.608972] i915 0000:00:02.0: [drm] drm_WARN_ON(!display->platform.skylake && !display->platform.kabylake)
> [5.608995] WARNING: CPU: 3 PID: 440 at drivers/gpu/drm/i915/display/intel_pch.c:126 intel_pch_type+0x1af/0xae0 [i915]
> [5.609317] CPU: 3 UID: 0 PID: 440 Comm: (udev-worker) Not tainted 6.15.0-rc3-drm-tip-2fa6469c618d #3 PREEMPT(voluntary)
> 
> Signed-off-by: Jiajia Liu <liujiajia@...inos.cn>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@...el.com>

pushed to drm-intel-next. Thanks for the finding and the patch

> ---
>  drivers/gpu/drm/i915/display/intel_pch.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_pch.c b/drivers/gpu/drm/i915/display/intel_pch.c
> index 5035b63a4889..469e8a3cfb49 100644
> --- a/drivers/gpu/drm/i915/display/intel_pch.c
> +++ b/drivers/gpu/drm/i915/display/intel_pch.c
> @@ -125,7 +125,8 @@ intel_pch_type(const struct intel_display *display, unsigned short id)
>  		drm_dbg_kms(display->drm, "Found SunrisePoint PCH\n");
>  		drm_WARN_ON(display->drm,
>  			    !display->platform.skylake &&
> -			    !display->platform.kabylake);
> +			    !display->platform.kabylake &&
> +			    !display->platform.coffeelake);
>  		return PCH_SPT;
>  	case INTEL_PCH_SPT_LP_DEVICE_ID_TYPE:
>  		drm_dbg_kms(display->drm, "Found SunrisePoint LP PCH\n");
> -- 
> 2.25.1
>