I found that in mono speaker mode, only the left channel is enable. The SPKOUTR_PGA_ENA bit remains 0 in this case. Thus when SPKOUTR_ENA is set, poor sound quality results.
-----Original Message----- From: Mark Brown [mailto:broo...@kernel.org] Sent: Wednesday, August 13, 2014 5:58 AM To: Charles Keepax Cc: CHAN Peter-B18700; alsa-de...@alsa-project.org; ti...@suse.de; linux-kernel@vger.kernel.org; patc...@opensource.wolfsonmicro.com; Wang Shengjiu-B02247; lgirdw...@gmail.com; Nicolin Chen; Chen Guangyu-B42378; r...@opensource.wolfsonmicro.com Subject: Re: [alsa-devel] [PATCH] ASoC: wm8962: Correct the bit offset to enable mono speaker output On Tue, Aug 12, 2014 at 09:24:16AM +0100, Charles Keepax wrote: > On Mon, Aug 11, 2014 at 02:19:49PM +0100, Charles Keepax wrote: > > From the wording of "tie both outputs together" in the datasheet I > > would assume that means both should be fed the same audio? Was this > > done? I will try to give the hardware guys here a shout and see if I > > can get some clarification on mono mode on this device. > I have had a word with the hardware team here and both channels do > need to be enabled but audio should only be fed to the left channel. > So the driver definitely needs updated for the mono case, but I am > unclear as to what is causing your poor audio quality issue. Overdriving the speaker perhaps? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
