linux-kernel - Re: [PATCH] sh: migor: Set DMA and DMA coherent mask

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Date:   Tue, 17 Apr 2018 16:39:10 +0200
From:   jacopo mondi <jacopo@...ndi.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     Jacopo Mondi <jacopo+renesas@...ndi.org>,
        Christoph Hellwig <hch@....de>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sh: migor: Set DMA and DMA coherent mask

Hi Geert,

On Tue, Apr 17, 2018 at 04:30:03PM +0200, Geert Uytterhoeven wrote:
> Hi Jacopo,
>
> CC Christoph
>
> On Tue, Apr 17, 2018 at 4:13 PM, Jacopo Mondi <jacopo+renesas@...ndi.org> wrote:
> > As of commit 205e1b7f51e4 ("dma-mapping: warn when there is no
> > coherent_dma_mask") the Migo-R platform devices registered without a DMA
> > mask and coherent DMA mask issue the following warning
> >
> > WARNING: CPU: 0 PID: 1 at ./include/linux/dma-mapping.h:516 0x40159e20
> >
> > Set dma mask and coherent DMA mask for Migo-R platforms devices to 32
> > bits as all other SH4a platforms do.
> >
> > Signed-off-by: Jacopo Mondi <jacopo+renesas@...ndi.org>
>
> Thanks for your patch!
>
> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
>
> I guess usbf_device.dev.dma_mask should be fixed as well?

I don't get any warning for that. The only platform devices on which
platform_resource_setup_memory() is called on before registering them
are the ones this patch modifies, if I'm not wrong.

>
> BTW, there are plenty of other SH platforms that need similar fixes.

Oh, why am I not surprised? :/

Thanks
   j

>
> > ---
> >  arch/sh/kernel/cpu/sh4a/setup-sh7722.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
> > index 6b3a26e..3fe1ea7 100644
> > --- a/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
> > +++ b/arch/sh/kernel/cpu/sh4a/setup-sh7722.c
> > @@ -7,6 +7,7 @@
> >   * License.  See the file "COPYING" in the main directory of this archive
> >   * for more details.
> >   */
> > +#include <linux/dma-mapping.h>
> >  #include <linux/init.h>
> >  #include <linux/mm.h>
> >  #include <linux/platform_device.h>
> > @@ -347,6 +348,8 @@ static struct platform_device vpu_device = {
> >         .name           = "uio_pdrv_genirq",
> >         .id             = 0,
> >         .dev = {
> > +               .dma_mask               = &vpu_device.dev.coherent_dma_mask,
> > +               .coherent_dma_mask      = DMA_BIT_MASK(32),
> >                 .platform_data  = &vpu_platform_data,
> >         },
> >         .resource       = vpu_resources,
> > @@ -375,6 +378,8 @@ static struct platform_device veu_device = {
> >         .name           = "uio_pdrv_genirq",
> >         .id             = 1,
> >         .dev = {
> > +               .dma_mask               = &veu_device.dev.coherent_dma_mask,
> > +               .coherent_dma_mask      = DMA_BIT_MASK(32),
> >                 .platform_data  = &veu_platform_data,
> >         },
> >         .resource       = veu_resources,
> > @@ -403,6 +408,8 @@ static struct platform_device jpu_device = {
> >         .name           = "uio_pdrv_genirq",
> >         .id             = 2,
> >         .dev = {
> > +               .dma_mask               = &jpu_device.dev.coherent_dma_mask,
> > +               .coherent_dma_mask      = DMA_BIT_MASK(32),
> >                 .platform_data  = &jpu_platform_data,
> >         },
> >         .resource       = jpu_resources,
>
> Gr{oetje,eeting}s,
>
>                         Geert
>
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
>
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds

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