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SubjectRe: [RFC PATCH 07/40] soundwire: intel: fix channel number reported by hardware
On 25-07-19, 18:39, Pierre-Louis Bossart wrote:
> PDI2 reports an invalid count, force the correct hardware-supported
> value
>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
> ---
> drivers/soundwire/intel.c | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c
> index 497879dd9c0d..51990b192dc0 100644
> --- a/drivers/soundwire/intel.c
> +++ b/drivers/soundwire/intel.c
> @@ -401,6 +401,15 @@ intel_pdi_get_ch_cap(struct sdw_intel *sdw, unsigned int pdi_num, bool pcm)
>
> if (pcm) {
> count = intel_readw(shim, SDW_SHIM_PCMSYCHC(link_id, pdi_num));
> +
> + /*
> + * TODO: pdi number 2 reports channel count as 1 even though
> + * it supports 8 channel. Performing hardcoding for pdi
> + * number 2.
> + */
> + if (pdi_num == 2)
> + count = 7;

Is that true for all Intel controllers or some generations. Would it not
be better to put this under some flag which is set on platform basis?

> +
> } else {
> count = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id));
> count = ((count & SDW_SHIM_PDMSCAP_CPSS) >>
> --
> 2.20.1

--
~Vinod

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