linux-kernel - Re: [PATCH v5 1/3] video: fbdev: atyfb: clarify ioremap() base and length used

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Message-ID: <CAB=NE6UKnhx0PoJp_wHeZMnXxHLsd8snzu2bOj=VWde=Bo-hVg@mail.gmail.com>
Date:	Tue, 7 Jul 2015 17:24:57 -0700
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Borislav Petkov <bp@...e.de>
Cc:	Ville Syrjälä <syrjala@....fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-fbdev <linux-fbdev@...r.kernel.org>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Dave Airlie <airlied@...hat.com>,
	Toshi Kani <toshi.kani@...com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Antonino Daplas <adaplas@...il.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Rob Clark <robdclark@...il.com>,
	Mathias Krause <minipli@...glemail.com>,
	Andrzej Hajda <a.hajda@...sung.com>,
	Mel Gorman <mgorman@...e.de>, Vlastimil Babka <vbabka@...e.cz>,
	Davidlohr Bueso <dbueso@...e.de>
Subject: Re: [PATCH v5 1/3] video: fbdev: atyfb: clarify ioremap() base and
 length used

On Thu, Jul 2, 2015 at 4:23 PM, Luis R. Rodriguez <mcgrof@...e.com> wrote:
> On Fri, Jun 26, 2015 at 12:30 AM, Borislav Petkov <bp@...e.de> wrote:
>> On Fri, Jun 26, 2015 at 03:09:27AM +0200, Luis R. Rodriguez wrote:
>>> Sure, mind this as a follow up patch if its too late?
>>
>> No need, you can send me an updated one - I'll replace it.
>
> Will do!

OK the commend I'm adding:

@@ -3489,6 +3489,15 @@ static int atyfb_setup_generic(struct pci_dev
*pdev, struct fb_info *info,

        /* Map in frame buffer */
        info->fix.smem_start = addr;
+
+       /*
+        * The framebuffer is not always 8 MiB that's just the size of the
+        * PCI BAR, this is later corrected for use with write-combining
+        * helpers with aty_fudge_framebuffer_len() which will adjust the
+        * framebuffer accordingly depending on the device. We do this
+        * to match semantics over ioremap calls on framebuffer devices
+        * with with other drivers with the info->fix.smem_len.
+        */
        info->fix.smem_len = 0x800000;

        info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len);

Will respin.

 Luis
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