From: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> [ Upstream commit 18046335643de6d21327f5ae034c8fb8463f6715 ] On all released Intel controllers (CNL/CML/ICL), PDI2 reports an invalid count, force the correct hardware-supported value This may have to be revisited with platform-specific values if the hardware changes, but for now this is good enough. Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/20190806005522.22642-3-pierre-louis.bossart@xxxxxxxxxxxxxxx Signed-off-by: Vinod Koul <vkoul@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/soundwire/intel.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 60293a00a14ee..8a670bc86c0ce 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -283,6 +283,16 @@ 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)); + + /* + * WORKAROUND: on all existing Intel controllers, pdi + * number 2 reports channel count as 1 even though it + * supports 8 channels. Performing hardcoding for pdi + * number 2. + */ + if (pdi_num == 2) + count = 7; + } else { count = intel_readw(shim, SDW_SHIM_PDMSCAP(link_id)); count = ((count & SDW_SHIM_PDMSCAP_CPSS) >> -- 2.20.1
