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soundwire: intel: Add pre/post bank switch ops 

To support multi link on Intel platforms, we need to update
SDW SHIM registers.

So, add pre/post bank switch ops for the same in Intel driver.

Signed-off-by: Sanyog Kale <sanyog.r.kale@intel.com>
Signed-off-by: Shreyas NC <shreyas.nc@intel.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Shreyas NC 2018-07-27 14:44:17 +05:30 committed by Vinod Koul
parent 9b5c132a1e
commit 30246e2d78
1 changed files with 65 additions and 0 deletions
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65
drivers/soundwire/intel.c
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@ -397,6 +397,69 @@ static int intel_config_stream(struct sdw_intel *sdw,
return -EIO;
}
/*
* bank switch routines
*/
static int intel_pre_bank_switch(struct sdw_bus *bus)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
struct sdw_intel *sdw = cdns_to_intel(cdns);
void __iomem *shim = sdw->res->shim;
int sync_reg;
/* Write to register only for multi-link */
if (!bus->multi_link)
return 0;
/* Read SYNC register */
sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
sync_reg |= SDW_SHIM_SYNC_CMDSYNC << sdw->instance;
intel_writel(shim, SDW_SHIM_SYNC, sync_reg);
return 0;
}
static int intel_post_bank_switch(struct sdw_bus *bus)
{
struct sdw_cdns *cdns = bus_to_cdns(bus);
struct sdw_intel *sdw = cdns_to_intel(cdns);
void __iomem *shim = sdw->res->shim;
int sync_reg, ret;
/* Write to register only for multi-link */
if (!bus->multi_link)
return 0;
/* Read SYNC register */
sync_reg = intel_readl(shim, SDW_SHIM_SYNC);
/*
* post_bank_switch() ops is called from the bus in loop for
* all the Masters in the steam with the expectation that
* we trigger the bankswitch for the only first Master in the list
* and do nothing for the other Masters
*
* So, set the SYNCGO bit only if CMDSYNC bit is set for any Master.
*/
if (!(sync_reg & SDW_SHIM_SYNC_CMDSYNC_MASK))
return 0;
/*
* 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, "Post bank switch failed: %d", ret);
return ret;
}
/*
* DAI routines
*/
@ -750,6 +813,8 @@ static struct sdw_master_ops sdw_intel_ops = {
.xfer_msg_defer = cdns_xfer_msg_defer,
.reset_page_addr = cdns_reset_page_addr,
.set_bus_conf = cdns_bus_conf,
.pre_bank_switch = intel_pre_bank_switch,
.post_bank_switch = intel_post_bank_switch,
};
/*