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soundwire: intel: introduce helper for link synchronization

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After arming the synchronization, the SYNCGO field controls the
hardware-based synchronization between links.

Move the programming and wait for clear of SYNCGO to dedicated helper.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Link: https://lore.kernel.org/r/20200716150947.22119-5-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-07-16 23:09:42 +08:00 committed by Vinod Koul
parent 02629e4548
commit 437e3289b5
1 changed files with 26 additions and 8 deletions
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34
drivers/soundwire/intel.c
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@ -512,6 +512,31 @@ static void intel_shim_sync_arm(struct sdw_intel *sdw)
mutex_unlock(sdw->link_res->shim_lock);
}
static int intel_shim_sync_go_unlocked(struct sdw_intel *sdw)
{
void __iomem *shim = sdw->link_res->shim;
u32 sync_reg;
int ret;
/* Read SYNC register */
sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
/*
* Set SyncGO bit to synchronously trigger a bank switch for
* all the masters. A write to SYNCGO bit clears CMDSYNC bit for all
* the Masters.
*/
sync_reg |= SDW_SHIM_SYNC_SYNCGO;
ret = intel_clear_bit(shim, SDW_SHIM_SYNC, sync_reg,
SDW_SHIM_SYNC_SYNCGO);
if (ret < 0)
dev_err(sdw->cdns.dev, "SyncGO clear failed: %d\n", ret);
return ret;
}
/*
* PDI routines
*/
@ -763,15 +788,8 @@ static int intel_post_bank_switch(struct sdw_bus *bus)
ret = 0;
goto unlock;
}
/*
* Set SyncGO bit to synchronously trigger a bank switch for
* all the masters. A write to SYNCGO bit clears CMDSYNC bit for all
* the Masters.
*/
sync_reg |= SDW_SHIM_SYNC_SYNCGO;
ret = intel_clear_bit(shim, SDW_SHIM_SYNC, sync_reg,
SDW_SHIM_SYNC_SYNCGO);
ret = intel_shim_sync_go_unlocked(sdw);
unlock:
mutex_unlock(sdw->link_res->shim_lock);