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 085B414C5A1; Thu, 11 Jul 2024 12:17:43 +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=1720700264; cv=none; b=qm2IG7vVngzZ+nSaBKkNxM4kqJQ2XPz7u0H5zzxYagoC2k7xxgCQ1SA/WwBU10Y5I8fPv5JKPF4GDfdvQoY99afFT0cm8ULjC4Yzvp/dlAqAe5OXjeXLDC3smOJijJ4F8rchNf1dXnGQfFlPOJOSZNkYOqoU874Nj3ghmM/Ls38= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720700264; c=relaxed/simple; bh=V8ATJ6Xx5N5Bku7Mvd49jTeUfTO682e6YmL0bwqtHMQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=DHYjQf+pdCKIjckpsHZnGYrJj9aKrXYEo9zP2eHs9bGIGuqs8ticTOB5dNwiE2gsZ2uQx2NNu7msHVXYki9MLi0ceGoFpQaxMZOEog7HeQ9yGexf9QPE4Za/hYDUJOs4QF2gKujF89YazEPRkIrNPP0v4KNVUenUmcBwDIy7Vd0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Pn8Yq6Nx; 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="Pn8Yq6Nx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 574D4C116B1; Thu, 11 Jul 2024 12:17:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720700263; bh=V8ATJ6Xx5N5Bku7Mvd49jTeUfTO682e6YmL0bwqtHMQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Pn8Yq6NxseRcYNSbLgTH4MS0sBnAPrLnv6vO7RJJ27mOwzsnA+tiDI8wpGWp+79qE vGh0r/Q0SxwnK4BicS2S0iVcPUx1yC0ZXbdtQCOoFeYND2mHVLbSV14PAP0/yIvCdu 0OEamTz1l6vFbhJCtoaSIx0Aa/esv7Ur60wXrKS67OhUV4tz8la5DTQUsiPqp4DQpL 0hxh6pCfTI9Sywrfu7qp8kyzHCuc5wXVBS9HO/QnbPFXPARH3ha4t+UY5l3jY/lVKp ViAAu6qnToGvxjJH4h5/rIQakVNuFN3U+vSlj+s5Nw+/WfiJIxwkAF3IidgXr3PVqQ 9igC+XPBG96VA== Message-ID: <08b57750-536c-4dbb-9688-fa0622b0bbb3@kernel.org> Date: Thu, 11 Jul 2024 14:17:35 +0200 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 09/13] media: qcom: camss: Add CSID Gen3 support for SM8550 To: Bryan O'Donoghue , Depeng Shao , rfoss@kernel.org, todor.too@gmail.com, mchehab@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: quic_eberman@quicinc.com, linux-media@vger.kernel.org, linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kernel@quicinc.com, Yongsheng Li References: <20240709160656.31146-1-quic_depengs@quicinc.com> <20240709160656.31146-10-quic_depengs@quicinc.com> <1da50dd1-b170-4775-94fc-19a10b7f9c47@kernel.org> <4c8095dd-4f96-4b0e-9282-8bdfb5badbc3@quicinc.com> <9255b3e4-874c-4919-b50a-919cf0f42f75@kernel.org> <064baf66-eecd-4982-864f-50b86b104ff6@quicinc.com> <4c26e896-69fa-413b-ace3-39c9698dd6aa@linaro.org> From: Krzysztof Kozlowski Content-Language: en-US Autocrypt: addr=krzk@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/07/2024 14:00, Bryan O'Donoghue wrote: > On 11/07/2024 12:41, Depeng Shao wrote: >>>> Yes, these are some sequences to initialize the HW. >>> >>> Hm? It's like you ignore the problem and just answer with whatever to >>> shut up the reviewer. Instead of replying with the same, address the >>> problem. Why ordering is not a problem here? >>> >> >> Sorry, I didn't mean that, was trying to understand the problem, then >> just sent out the mail by mistake. >> Do you mean we should use writel to ensure the strict sequences? >> Thanks for catching this problem, this problem is also in the the >> existing camss driver. I will check all of them in this series, but the >> problem in some existing camss drivers, maybe Bryan from Linaro can help >> to fix them, since I don't have these devices to verify the modifications. > > _relaxed is used I'm sure because that's what's always been used and > what downstream does. > > Is there a good reason for it ? None that I can think of. > > Krzysztof is right, there's no good reason to use relaxed() here at all, > you should drop it. > In many cases relaxed will be fine, but in few might lead to tricky to debug issues thus people introducing msleep() or other workarounds. Usually init sequences are "sequences" for a reason, but of course here maybe it does not matter. Best regards, Krzysztof