linux-kernel - Re: [PATCH 1/6 v2] ARM: Add basic architecture support for VIA/WonderMedia 85xx SoC's

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Message-ID: <AANLkTimFJ=Brx4pDiUqZOKDfABaDg0s_yFC7EkZGi7D8@mail.gmail.com>
Date:	Sun, 7 Nov 2010 20:08:45 +0300
From:	Alexey Charkov <alchark@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	linux-arm-kernel@...ts.infradead.org,
	vt8500-wm8505-linux-kernel@...glegroups.com,
	Eric Miao <eric.y.miao@...il.com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Albin Tonnerre <albin.tonnerre@...e-electrons.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/6 v2] ARM: Add basic architecture support for
 VIA/WonderMedia 85xx SoC's

2010/11/7 Russell King - ARM Linux <linux@....linux.org.uk>:
> On Sun, Nov 07, 2010 at 07:28:52PM +0300, Alexey Charkov wrote:
>> +static inline void preallocate_fb(struct vt8500fb_platform_data *p,
>> +                               unsigned long align) {
>> +     p->video_mem_len = (p->xres_virtual * p->yres_virtual * 4) >>
>> +                     (p->bpp > 16 ? 0 : (p->bpp > 8 ? 1 :
>> +                                     (8 / p->bpp) + 1));
>> +     p->video_mem_phys = (unsigned long)memblock_alloc(p->video_mem_len,
>> +                                                       align);
>> +     p->video_mem_virt = phys_to_virt(p->video_mem_phys);
>> +}
> ...
>> +void __init vt8500_map_io(void)
>> +{
>> +     wmt_current_regs = &wmt_regmaps[VT8500_INDEX];
>> +     wmt_current_irqs = &wmt_irqs[VT8500_INDEX];
>> +     set_data();
>> +#ifdef CONFIG_FB_VT8500
>> +     panels[current_panel_idx].bpp = 16; /* Always use RGB565 */
>> +     preallocate_fb(&panels[current_panel_idx], SZ_4M);
>> +     vt8500_device_lcdc.dev.platform_data = &panels[current_panel_idx];
>> +#endif
>> +     iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
>> +}
> ...
>> +void __init wm8505_map_io(void)
>> +{
>> +     wmt_current_regs = &wmt_regmaps[WM8505_INDEX];
>> +     wmt_current_irqs = &wmt_irqs[WM8505_INDEX];
>> +     set_data();
>> +#ifdef CONFIG_FB_WM8505
>> +     panels[current_panel_idx].bpp = 32; /* Always use RGB888 */
>> +     preallocate_fb(&panels[current_panel_idx], 32);
>> +     vt8500_device_wm8505_fb.dev.platform_data = &panels[current_panel_idx];
>> +#endif
>> +     iotable_init(vt8500_io_desc, ARRAY_SIZE(vt8500_io_desc));
>> +}
>
> I'd much prefer that the allocation of memblock memory is done via the
> 'reserve' machine callback, rather than trying to group it into the IO
> mapping callback.  Is there a reason it can't be?
>

I believe it can. Thanks for the info, I just didn't know about that.
Will fix this shortly.

Is it OK to leave resources assignment in map_io or is there a better
place to do that as well?
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