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SubjectRe: [PATCH v5 1/4] video: fbdev: atyfb: only use ioremap_uc() on i386 and ia64
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On 9/21/23 13:04, Baoquan He wrote:
> From: Arnd Bergmann <arnd@arndb.de>
>
> ioremap_uc() is only meaningful on old x86-32 systems with the PAT
> extension, and on ia64 with its slightly unconventional ioremap()
> behavior, everywhere else this is the same as ioremap() anyway.
>
> Change the only driver that still references ioremap_uc() to only do so
> on x86-32/ia64 in order to allow removing that interface at some
> point in the future for the other architectures.
>
> On some architectures, ioremap_uc() just returns NULL, changing
> the driver to call ioremap() means that they now have a chance
> of working correctly.
>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Baoquan He <bhe@redhat.com>
> Reviewed-by: Luis Chamberlain <mcgrof@kernel.org>
> Cc: Helge Deller <deller@gmx.de>
> Cc: Thomas Zimmermann <tzimmermann@suse.de>
> Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
> Cc: linux-fbdev@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org

applied to fbdev git tree.

Thanks!
Helge


> ---
> drivers/video/fbdev/aty/atyfb_base.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/video/fbdev/aty/atyfb_base.c b/drivers/video/fbdev/aty/atyfb_base.c
> index 5c87817a4f4c..3dcf83f5e7b4 100644
> --- a/drivers/video/fbdev/aty/atyfb_base.c
> +++ b/drivers/video/fbdev/aty/atyfb_base.c
> @@ -3440,11 +3440,15 @@ static int atyfb_setup_generic(struct pci_dev *pdev, struct fb_info *info,
> }
>
> info->fix.mmio_start = raddr;
> +#if defined(__i386__) || defined(__ia64__)
> /*
> * By using strong UC we force the MTRR to never have an
> * effect on the MMIO region on both non-PAT and PAT systems.
> */
> par->ati_regbase = ioremap_uc(info->fix.mmio_start, 0x1000);
> +#else
> + par->ati_regbase = ioremap(info->fix.mmio_start, 0x1000);
> +#endif
> if (par->ati_regbase == NULL)
> return -ENOMEM;
>

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