linux-kernel - [PATCH AUTOSEL 5.15 01/28] fbdev: atyfb: only use ioremap

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Message-ID: <20231029225916.791798-1-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 18:58:36 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Baoquan He <bhe@...hat.com>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Helge Deller <deller@....de>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        linux-fbdev@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        Sasha Levin <sashal@...nel.org>, javierm@...hat.com,
        sam@...nborg.org, xu.panda@....com.cn, steve@....org,
        schnelle@...ux.ibm.com
Subject: [PATCH AUTOSEL 5.15 01/28] fbdev: atyfb: only use ioremap_uc() on i386 and ia64

From: Arnd Bergmann <arnd@...db.de>

[ Upstream commit c1a8d1d0edb71dec15c9649cb56866c71c1ecd9e ]

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@...db.de>
Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>
Cc: Helge Deller <deller@....de>
Cc: Thomas Zimmermann <tzimmermann@...e.de>
Cc: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: linux-fbdev@...r.kernel.org
Cc: dri-devel@...ts.freedesktop.org
Signed-off-by: Helge Deller <deller@....de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 1aef3d6ebd880..246bf67b32ea0 100644
--- a/drivers/video/fbdev/aty/atyfb_base.c
+++ b/drivers/video/fbdev/aty/atyfb_base.c
@@ -3447,11 +3447,15 @@ 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;
 
-- 
2.42.0