From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.12]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69F881E511; Sat, 30 May 2026 07:12:54 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.12 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780125176; cv=none; b=QQXoDraFwaZXr2scZ0NuZihV9lK27jG4NCSG086IJpvNtZCy3yHFKu+0j8jhL95Aa1Ocx0ki+Jak9uDrWgtXW29KJDiNGgOdbEU8TRVc0sIy4a7oulvp3LD/UiEkSawOgwVIqr9YEUPazlZ4I/puENZ1lVDPDHccvz+ngR9xgcw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1780125176; c=relaxed/simple; bh=SERNN2GCxyjfcqCL9J8VPzF/r6mvZy/lSmf7ixI0kpU=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=lGtokNKciAeaN07oRECMaVfzWyw4fahMrpLT1p3N9zMp/dZ6JJJU5ESSdNLGuTkq/gYnpkFCJiCr3C9gMAeoiUsi+X+g5J6IGH4YpTVO75wyfHpbnHlhUbclbh1sgt1X9UUfsyCQrgbH/XvoC/tgcFQWG12SbC1N2nebshiwJqc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=TCqA/OdM; arc=none smtp.client-ip=198.175.65.12 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="TCqA/OdM" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1780125174; x=1811661174; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=SERNN2GCxyjfcqCL9J8VPzF/r6mvZy/lSmf7ixI0kpU=; b=TCqA/OdM/mYqxWiNIvVH+MZ+LC5Au2tPD0pl6PKjFunD9ZMF8OhpVLQK C4pTff5TjoIk27jq6O7dOz6xJ/H8+UFEa3jNoVikWdhm80KHuKrNPUmtY lyApoqEgGXhOyJrx+pBSKjfgBcnXflaSCrYKWoShRvyyphK5KC6qAPYtu MVM1mEhIaqgYIp0ZNlQ++/N/2Dc/i+jFBfldrEwPpNPIF9pHfsozKHcgW 1RM2++WPps5jIL9oWJvB7Cbgzvo2sR8HuK8G94XaPrMz2bz+HtDbiYBGa RS2pl46G9QtrJkGo+lnZxNkKaC5qzBHNHXQihdrXjO3vbzPof4wEcMlOQ g==; X-CSE-ConnectionGUID: 72khBkH2QHq5FMkVLxK2NA== X-CSE-MsgGUID: Q8f6YYkMTpWppW1SrmdTwQ== X-IronPort-AV: E=McAfee;i="6800,10657,11801"; a="92439256" X-IronPort-AV: E=Sophos;i="6.24,176,1774335600"; d="scan'208";a="92439256" Received: from fmviesa003.fm.intel.com ([10.60.135.143]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 May 2026 00:12:53 -0700 X-CSE-ConnectionGUID: tHr/vr9ERVWUz6ePOk37mQ== X-CSE-MsgGUID: cmuU7zmDRZeZ5kCnC1Fodg== X-ExtLoop1: 1 Received: from black.igk.intel.com ([10.91.253.5]) by fmviesa003.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 May 2026 00:12:51 -0700 Date: Sat, 30 May 2026 09:12:48 +0200 From: Raag Jadav To: Zhan Wei Cc: matthew.brost@intel.com, thomas.hellstrom@linux.intel.com, rodrigo.vivi@intel.com, corbet@lwn.net, skhan@linuxfoundation.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3] drm/xe/hwmon: document DG2 fan speed reporting quirk Message-ID: References: <20260529172449.41504-1-zhanwei919@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260529172449.41504-1-zhanwei919@gmail.com> On Sat, May 30, 2026 at 01:24:49AM +0800, Zhan Wei wrote: > On DG2 the driver always shows two fan channels, because the > FSC_READ_NUM_FANS command does not work on some cards. OEMs decide how > the fans map to tach channels, so two fans can share one tach line. > When that happens, the second channel reads 0 RPM even though the fan > is spinning. > > Note this on the fan2_input ABI entry so the steady 0 RPM is not > mistaken for a driver bug. Fixes: 28f79ac609de ("drm/xe/hwmon: expose fan speed") > Signed-off-by: Zhan Wei Reviewed-by: Raag Jadav