From: Mark Brown <broonie@opensource.wolfsonmicro.com>
To: Scott Jiang <scott.jiang.linux@gmail.com>
Cc: alsa-devel@alsa-project.org
Subject: Re: snd soc spi read/write
Date: Fri, 5 Aug 2011 07:34:14 +0100 [thread overview]
Message-ID: <20110805063414.GB20809@opensource.wolfsonmicro.com> (raw)
In-Reply-To: <CAHG8p1AkbrfX3dkLw=MNf24V3peMB33z-vLdVyzRxvGmSNTWSg@mail.gmail.com>
On Fri, Aug 05, 2011 at 02:26:33PM +0800, Scott Jiang wrote:
> My register address is 0x806(8bit global addr + 8bit reg addr), for
> example, reg_cache_size is 0x20.
> snd_soc_cache_write will not be called. And kernel oops in do_hw_read
> BUG_ON(!codec->hw_read);
> That is what I found when asoc was upgraded to 3.0, my codec is ad1938.
> The key issue is register is 8 bits, hardware needs 16 bits addr. If I
> change reg_cache_size to 2^16=64K, I think everything goes well.
> But it will waste a lot of memory for only 32 registers.
Oh, this is just fail. Does the hardware have readback support?
next prev parent reply other threads:[~2011-08-05 6:34 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-04 10:24 snd soc spi read/write Scott Jiang
2011-08-04 10:35 ` Mark Brown
2011-08-05 2:24 ` Scott Jiang
2011-08-05 5:42 ` Mark Brown
2011-08-05 6:26 ` Scott Jiang
2011-08-05 6:34 ` Mark Brown [this message]
[not found] ` <CAHG8p1BBza_M_Cgrq2O2U+Xc-=rPHeNBKMD_KwfZsLX5Npz9jA@mail.gmail.com>
[not found] ` <20110805072908.GA28149@opensource.wolfsonmicro.com>
2011-08-05 8:00 ` Scott Jiang
2011-08-05 8:30 ` Mark Brown
2011-08-09 3:41 ` Scott Jiang
2011-08-09 16:04 ` Mark Brown
2011-08-10 11:54 ` Takashi Iwai
2011-08-10 14:55 ` Mark Brown
2011-08-10 15:00 ` Takashi Iwai
2011-08-10 15:03 ` Mark Brown
2011-08-10 15:15 ` Takashi Iwai
2011-08-10 15:34 ` Mark Brown
2011-08-10 16:02 ` Takashi Iwai
2011-08-11 3:17 ` Mark Brown
2011-08-10 21:31 ` Lars-Peter Clausen
2011-08-11 0:33 ` Mark Brown
2011-08-11 1:50 ` Lars-Peter Clausen
2011-08-11 2:46 ` Mark Brown
2011-08-11 3:09 ` Lars-Peter Clausen
2011-08-11 5:32 ` Mark Brown
2011-08-11 6:41 ` Lars-Peter Clausen
2011-08-17 9:16 ` Dimitris Papastamos
2011-08-05 6:11 ` Takashi Iwai
2011-08-05 6:21 ` Takashi Iwai
2011-08-05 6:27 ` Mark Brown
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