> -----Original Message----- > From: Hans de Goede [mailto:hdegoede@xxxxxxxxxx] > Sent: Sunday, October 15, 2017 2:12 AM > To: Pierre-Louis Bossart; Bard Liao > Cc: alsa-devel@xxxxxxxxxxxxxxxx > Subject: Cherry Trail + RT5645 devices with a mono speaker ? > > Hi Pierre-Louis, Bard, > > I've been looking into getting some Cherry Trail + RT5645 > devices with a mono speaker I have to work properly. > > Specifically the goal is to mix the right channel into > the left output, so that sounds which are only played > over the right channel do not get lost. > > I'm using this UCM file: > https://github.com/plbossart/UCM/blob/master/byt-rt5640/HiFi > > Looking at the rtl5640 UCM file, getting the mono speaker > to work (in a first simple attempt) should be as simple > as replacing: > > cset "name='SPOR MIX SPKVOL R Switch' on" > > With > > cset "name='SPOL MIX SPKVOL R Switch' on" > > But this does not work, the speaker test sound for the > right speaker is still silent (works with headphones). > > I've also looked into directly poking the > RT5645_SPO_MIXER i2c register for testing, but when > checking its value with the original unmodified UCM > file: > > [root@localhost ~]# i2cget -y -f 1 0x1a 0x48 w > 0x06c8 > > That is: 0xc806 as the output of i2cget "w" mode > needs byteswapping. Note that both the > RT5645_M_SV_L_SPM_L and RT5645_M_SV_R_SPM_L bits > are already cleared, which is weird as this is > before I've modified anything. Also the > RT5645_M_SV_R_SPM_R bit is cleared, but that is > expected. > > Even if I manually set reg 0x48 to 0x07c8 which AFAIK > should enable output of both left and right channels > on the left speaker I still only get sounds played > on the left channel. > > Any insights / help with this would be very much > welcome. Could you dump all registers for us? > > Regards, > > Hans > > ------Please consider the environment before printing this e-mail. _______________________________________________ Alsa-devel mailing list Alsa-devel@xxxxxxxxxxxxxxxx http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
