linux-kernel - Re: [PATCH] ASoC: mediatek: Enable 33bit memory address to support 4GB DRAM

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Date:	Mon, 11 Jan 2016 10:02:21 +0100
From:	Takashi Iwai <tiwai@...e.de>
To:	PC Liao <pc.liao@...iatek.com>
Cc:	<broonie@...nel.org>, <srv_heupstream@...iatek.com>,
	<linux-mediatek@...ts.infradead.org>, <s.hauer@...gutronix.de>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <alsa-devel@...a-project.org>,
	<koro.chen@...iatek.com>,
	Hidalgo Huang <hidalgo.huang@...iatek.com>
Subject: Re: [PATCH] ASoC: mediatek: Enable 33bit memory address to support 4GB DRAM

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