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Thu, 12 Dec 2024 05:04:47 -0500 (EST) Date: Thu, 12 Dec 2024 11:04:45 +0100 From: Niklas =?utf-8?Q?S=C3=B6derlund?= To: Sakari Ailus Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH] media: rcar-csi2: Update D-PHY startup on V4M Message-ID: <20241212100445.GB878403@ragnatech.se> References: <20241210155400.3137792-1-niklas.soderlund+renesas@ragnatech.se> Precedence: bulk X-Mailing-List: linux-renesas-soc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Hej Sakari, On 2024-12-12 07:20:15 +0000, Sakari Ailus wrote: > Hej Niklas, > > On Tue, Dec 10, 2024 at 04:54:00PM +0100, Niklas Söderlund wrote: > > The latest datasheet (Rev.0.70) updates the D-PHY start-up sequence for > > D-PHY operation. Unfortunately the datasheet do not add any additional > > documentation on the magic values. > > > > This have been tested together with the MAX96724 available on the single > > board test platform and it works as expected. > > > > Signed-off-by: Niklas Söderlund > > This looks like a fix. Is there a need to backport it? It's an update to the start-up sequence. Both the old and new sequence works in testing. As the datasheet don't document the magic values it's hard to tell if this is a real fix or not. On the other hand, the DTS changes needed to use this device on R-Car V4M are still pending upstream merge so we have no in-tree users of this device. I don't think we need to backport this change. -- Kind Regards, Niklas Söderlund