El jue, 24 nov 2022 a las 12:13, Charles Keepax (ckeepax@opensource.cirrus.com) escribió:
On Thu, Nov 24, 2022 at 10:57:34AM +0100, Guillermo Rodriguez Garcia wrote:
Hi all,
I am using a dev board with a Cirrus Logic cs24l51 codec.
This used to work fine prior to kernel version 5.x, however after 5.x it is not possible to set certain values for ALSA controls from userspace.
I believe this is related to the input validation that is mentioned in this thread: https://lore.kernel.org/all/Yph8C3bRxcr6ogW7@sirena.org.uk/T/, and possibly in this commit: 4f1e50d6a9cf9c1b8c859d449b5031cacfa8404e ("ASoC: ops: Reject out of bounds values in snd_soc_put_volsw_sx()")
For the cs24l51, all the controls that fail are using the SOC_DOUBLE_R_SX_TLV macro.
I have traced this to the checks in snd_soc_put_volsw_sx, specifically the (val > max - min) check:
Can you try these two patches:
https://lore.kernel.org/all/165236477046.1016627.15470197691244479154.b4-ty@...
Thanks. In my tests, these patches seem to fix the problem for some values, but not for all of them:
$ amixer cset name='Analog Playback Volume' '208','208' numid=3,iface=MIXER,name='Analog Playback Volume' ; type=INTEGER,access=rw---R--,values=2,min=0,max=228,step=0 : values=208,208 | dBscale-min=-102.00dB,step=0.50dB,mute=0
$ amixer cset name='Analog Playback Volume' '180','180' amixer: Control default element write error: Invalid argument
Looking at the code I'd say that patch 1/2 is correct however I have doubts about patch 2/2:
val_mask = mask << rshift; val2 = (ucontrol->value.integer.value[1] + min) & mask; + + if (mc->platform_max && val2 > mc->platform_max) + return -EINVAL; + if (val2 > max) + return -EINVAL; + val2 = val2 << rshift;
err = snd_soc_component_update_bits(component, reg2, val_mask,
The checks for max and platform_max are done on val2, but val2 is already the result of adding the minimum value ('min') and applying the mask. Shouldn't the checks be done on ucontrol->value.integer.value[1] instead?
Thanks,
Guillermo Rodriguez Garcia guille.rodriguez@gmail.com