linux-kernel - Re: [PATCH v2 02/24] drivers/video/fbdev: use ioremap_wc/wt() instead of _

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Message-Id: <20180913170233eucas1p19e6cd20020f27bb4db0cd927bb9a3302~UBFkQTUaX2145421454eucas1p1M@eucas1p1.samsung.com>
Date:   Thu, 13 Sep 2018 19:02:31 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Christophe Leroy <christophe.leroy@....fr>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Geoff Levand <geoff@...radead.org>,
        Jens Axboe <axboe@...nel.dk>,
        Kumar Gala <galak@...nel.crashing.org>,
        Li Yang <leoyang.li@....com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>,
        Paul Mackerras <paulus@...ba.org>,
        Scott Wood <oss@...error.net>, aneesh.kumar@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-block@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH v2 02/24] drivers/video/fbdev: use ioremap_wc/wt()
 instead of __ioremap()


On 09/12/2018 05:58 PM, Christophe Leroy wrote:
> _PAGE_NO_CACHE is a platform specific flag. In addition, this flag
> is misleading because one would think it requests a noncached page
> whereas a noncached page is _PAGE_NO_CACHE | _PAGE_GUARDED
> 
> _PAGE_NO_CACHE alone means write combined noncached page, so lets
> use ioremap_wc() instead.
> 
> _PAGE_WRITETHRU is also platform specific flag. Use ioremap_wt()
> instead.
> 
> Signed-off-by: Christophe Leroy <christophe.leroy@....fr>

After reading patch #1 this one LGTM.

Acked-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>

> ---
>  drivers/video/fbdev/chipsfb.c    |  3 +--
>  drivers/video/fbdev/controlfb.c  |  5 +----
>  drivers/video/fbdev/platinumfb.c |  5 +----
>  drivers/video/fbdev/valkyriefb.c | 12 ++++++------
>  4 files changed, 9 insertions(+), 16 deletions(-)

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics