From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 A2E42183CC3; Tue, 5 Aug 2025 09:25:47 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754385947; cv=none; b=g1gnUU2B2YQ22iQsv04Xq7xP7x6EyR+qfOmqFwClfLBASxwuTzB2DZbZrE9Eg8zzXFcXvjOB9o3KNUsY0cE28HzEHNg1Hnby+8I/sAfIA6u+n15l2sBtmKlbf4stWMIc5HWHIsrVaGaFzKepGrbjL1xjvhux3eakLH+uX4loRgk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754385947; c=relaxed/simple; bh=+m+N+iT9UFauBP/qvow0voelhh0Op+NGM9/wRMfrGD8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=gD4+YD8K+aKJOjGK/L6BWB+hwHoKTZait8afoelaqSJalsUAP68sEe9KK6T/C2SSY9QzVuVmiGeDggVRN3hy8HgSvWGEyBwtphIh0DG9yQQokH+j8SiuydhqCYqsv0GL4+lV+iDOakXn493lB9QHk5d3oe8G9ulXXnLiHfrp3v4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=p1IWKx7s; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="p1IWKx7s" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9A8FDC4CEF0; Tue, 5 Aug 2025 09:25:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754385947; bh=+m+N+iT9UFauBP/qvow0voelhh0Op+NGM9/wRMfrGD8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=p1IWKx7soj5/7c3n2Dep7d67OTvNgyQxpu3Kvp/V4+/uJg0S7H+7QAlafArPD6PPl k02dODygGWvoNuZO3xgweCCXQhlOovvD2rh0IIgD+iZrZdqoXyOr/EYEoumlNc9ZO4 s6sJnDqihPRHxaE3yPd2axZZcL5L81JXVI3K9qXB2KtytkAjAom1aFJ4falvMwNM3c ycl5tXalyQTDHOKNR4DWnIRF/4F+xHJ0g1/r8d9AqgHQbSnXy5uB2GsZvq3cxVksvr qeQ4UE+IloUdX5CRnQmMLfCoUvHRQVH0mMmUpYtGkyQUTiLuWve9w17vZH13yodBwT aCdDTjXknz6bw== Message-ID: <8b023e56-435b-43df-8b15-c562a494e06f@kernel.org> Date: Tue, 5 Aug 2025 11:25:40 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH V4 4/4] arm64: dts: qcom: sm8550: Remove SDR104/SDR50 broken capabilities To: Sarthak Garg , Ulf Hansson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Bjorn Andersson , Konrad Dybcio , Adrian Hunter Cc: linux-mmc@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, quic_cang@quicinc.com, quic_nguyenb@quicinc.com, quic_rampraka@quicinc.com, quic_pragalla@quicinc.com, quic_sayalil@quicinc.com, quic_nitirawa@quicinc.com, quic_bhaskarv@quicinc.com, kernel@oss.qualcomm.com References: <20250801084518.2259767-1-quic_sartgarg@quicinc.com> <20250801084518.2259767-5-quic_sartgarg@quicinc.com> <69f2807c-9a28-4b31-97cc-2756f0ab9fd4@kernel.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 05/08/2025 11:19, Sarthak Garg wrote: > > > On 8/1/2025 2:32 PM, Krzysztof Kozlowski wrote: >> On 01/08/2025 10:45, Sarthak Garg wrote: >>> The kernel now handles level shifter limitations affecting SD card >>> modes, making it unnecessary to explicitly disable SDR104 and SDR50 >>> capabilities in the device tree. >>> >>> However, due to board-specific hardware constraints particularly related >>> to level shifter in this case the maximum frequency for SD High-Speed >>> (HS) mode must be limited to 37.5 MHz to ensure reliable operation of SD >>> card in HS mode. This is achieved using the max-sd-hs-frequency property >>> in the board DTS. >>> >>> Signed-off-by: Sarthak Garg >>> --- >>> arch/arm64/boot/dts/qcom/sm8550-hdk.dts | 1 + >>> arch/arm64/boot/dts/qcom/sm8550-mtp.dts | 1 + >>> arch/arm64/boot/dts/qcom/sm8550-sony-xperia-yodo-pdx234.dts | 1 + >>> arch/arm64/boot/dts/qcom/sm8550.dtsi | 3 --- >>> 4 files changed, 3 insertions(+), 3 deletions(-) >>> >> >> This will break MMC for all of the users and nothing in commit msg or >> cover letter explains that or mentions merging strategy. >> >> Exactly this case is covered by your internal guideline, no? Please read it. >> >> Best regards, >> Krzysztof > > Just to make sure I’m addressing the right concern — are you primarily > worried about the introduction of the max-sd-hs-frequency property in > the board DTS files, or about the removal of the sdhci-caps-mask > from the common sm8550.dtsi? Apply this patch and test MMC. Does it work? No. Was it working? Yes. Best regards, Krzysztof