linux-kernel - Re: [PATCH v3 1/1] regmap: Synchronize cache for the page selector

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Message-ID: <Z5s2gpIj-HOiHD3C@smile.fi.intel.com>
Date: Thu, 30 Jan 2025 10:21:22 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Danilo Krummrich <dakr@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v3 1/1] regmap: Synchronize cache for the page selector

On Wed, Jan 29, 2025 at 06:50:57PM +0100, Marek Szyprowski wrote:
> On 29.01.2025 16:07, Andy Shevchenko wrote:
> >> [...]
> > Meanwhile, can you test this patch (on top of non-working case)?
> >
> > If I understood the case, the affected driver doesn't use case and we actually
> > write to the selector register twice which most likely messes up the things.
> > But this is only a theory (since we don't have the traces yet).
> 
> Bingo! This patch (on top of current linux-next) fixed the probe issue. 
> Feel free to add:
> 
> Reported-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Tested-by: Marek Szyprowski <m.szyprowski@...sung.com>

Thank you! I will test it on my HW as well to confirm that there no regressions
and will submit a formal fix.

> (although I'm not sure if this is a fix for the generic case or just 
> this driver)

This is for all cases where cache is not in use.

-- 
With Best Regards,
Andy Shevchenko