[alsa-devel] [PATCH] ASoC: mediatek: Enable 33bit memory address to support 4GB DRAM

[PC Liao]

On Mon, 2016-01-11 at 17:02 +0800, Takashi Iwai wrote:
> On Mon, 11 Jan 2016 09:00:50 +0100,
> PC Liao wrote:
> > 
> > @@ -603,7 +606,10 @@ static int mtk_afe_dais_hw_params(struct snd_pcm_substream *substream,
> >  	if (ret < 0)
> >  		return ret;
> >  
> > -	memif->phys_buf_addr = substream->runtime->dma_addr;
> > +	if (sizeof(dma_addr_t) > 4)
> > +		msb_at_bit33 = (substream->runtime->dma_addr & 0x100000000) ? 1 : 0;
> 
> Better to put a proper suffix for the constant over 32bit.
> 
> Or use upper_32_bits().  Then sizeof() check can be omitted, as the
> compiler should be smart enough to know it beforehand.
> 
> 
> Takashi


Hi Takashi,

Thanks for your comment.
I change as below:
@@ -606,10 +606,8 @@ static int mtk_afe_dais_hw_params(struct
snd_pcm_substream
        if (ret < 0)
                return ret;

-       if (sizeof(dma_addr_t) > 4)
-               msb_at_bit33 = (substream->runtime->dma_addr &
0x100000000) ? 1
-
-       memif->phys_buf_addr = substream->runtime->dma_addr &
0xffffffff;
+       msb_at_bit33 = upper_32_bits(substream->runtime->dma_addr) ? 1 :
0;
+       memif->phys_buf_addr =
lower_32_bits(substream->runtime->dma_addr);


Dose this change follow your idea?
Thanks! 

PC Liao