From: Chao Song chao.song@linux.intel.com
Start from ACE1.x, DOAISE is added to AC timing control register bit 5, it combines with DOAIS to get effective timing, and has the default value 1.
The current code fills DOAIS, DACTQE and DODS bits to a variable initialized to zero, and updates the variable to AC timing control register. With this operation, We change DOAISE to 0, and force a much more aggressive timing. The timing is even unable to form a working waveform on SDA pin on Meteorlake.
This patch uses read-modify-write operation for the AC timing control register access, thus makes sure those bits not supposed and intended to change are not touched.
Signed-off-by: Chao Song chao.song@linux.intel.com Reviewed-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com --- drivers/soundwire/intel.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/soundwire/intel.c b/drivers/soundwire/intel.c index 238acf5c97a9..8cd2c73ac66f 100644 --- a/drivers/soundwire/intel.c +++ b/drivers/soundwire/intel.c @@ -260,7 +260,7 @@ static void intel_shim_init(struct sdw_intel *sdw) { void __iomem *shim = sdw->link_res->shim; unsigned int link_id = sdw->instance; - u16 ioctl = 0, act = 0; + u16 ioctl = 0, act;
/* Initialize Shim */ ioctl |= SDW_SHIM_IOCTL_BKE; @@ -281,6 +281,7 @@ static void intel_shim_init(struct sdw_intel *sdw)
intel_shim_glue_to_master_ip(sdw);
+ act = intel_readw(shim, SDW_SHIM_CTMCTL(link_id)); u16p_replace_bits(&act, 0x1, SDW_SHIM_CTMCTL_DOAIS); act |= SDW_SHIM_CTMCTL_DACTQE; act |= SDW_SHIM_CTMCTL_DODS;