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Wysocki" , Danilo Krummrich , Dmitry Baryshkov , DRI mailing list Subject: Re: [PATCH v3 1/1] regmap: Synchronize cache for the page selector Message-ID: References: <20250116124303.3941583-1-andriy.shevchenko@linux.intel.com> <8a7581e4-6422-4d77-8027-02df0d7da489@samsung.com> <42fe4488-0ff2-4b92-ae11-cce1664a7176@samsung.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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <42fe4488-0ff2-4b92-ae11-cce1664a7176@samsung.com> Organization: Intel Finland Oy - BIC 0357606-4 - Westendinkatu 7, 02160 Espoo On Tue, Jan 21, 2025 at 08:33:09AM +0100, Marek Szyprowski wrote: > On 17.01.2025 18:28, Andy Shevchenko wrote: > > On Fri, Jan 17, 2025 at 05:05:42PM +0100, Marek Szyprowski wrote: > > Does it fail in the same way? > > Yes, the hw revision is reported as zero in this case: LT9611 revision: > 0x00.00.00 Hmm... This is very interesting! It means that the page selector is a bit magical there. Dmitry, can you chime in and perhaps shed some light on this? > >> Does it mean that there is really a bug in the driver? > > Without looking at the datasheet it's hard to say. At least what I found so far > > is one page of the I²C traffic dump on Windows as an example how to use their > > evaluation board and software, but it doesn't unveil the bigger picture. At > > least what I think is going on here is that the programming is not so easy as > > just paging. Something is more complicated there. > > > > But at least (and as Mark said) the most of the regmap based drivers got > > the ranges wrong (so, at least there is one bug in the driver). > > I can do more experiments if this helps. Do you need a dump of all > regmap accesses or i2c traffic from this driver? It would be helpful! Traces from the failed and non-failed cases till the firmware revision and chip ID reading would be enough to start with. -- With Best Regards, Andy Shevchenko