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    Subject[PATCH v2 16/17] soundwire: cadence: multi-link support
    Date
    Enable multi-link (aka multi-master configuration). In this
    configuration, updates and commands with the 'ssp_sync' tag will be
    deferred and controlled by the gsync hardware signal.

    Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
    ---
    drivers/soundwire/cadence_master.c | 12 ++++++++++--
    1 file changed, 10 insertions(+), 2 deletions(-)

    diff --git a/drivers/soundwire/cadence_master.c b/drivers/soundwire/cadence_master.c
    index 55cf219cc908..eedc4cefdab0 100644
    --- a/drivers/soundwire/cadence_master.c
    +++ b/drivers/soundwire/cadence_master.c
    @@ -843,7 +843,13 @@ int sdw_cdns_exit_reset(struct sdw_cdns *cdns)
    CDNS_MCP_CONTROL_HW_RST);

    /* commit changes */
    - return cdns_config_update(cdns);
    + cdns_updatel(cdns, CDNS_MCP_CONFIG_UPDATE,
    + CDNS_MCP_CONFIG_UPDATE_BIT,
    + CDNS_MCP_CONFIG_UPDATE_BIT);
    +
    + /* don't wait here */
    + return 0;
    +
    }
    EXPORT_SYMBOL(sdw_cdns_exit_reset);

    @@ -1104,7 +1110,9 @@ int sdw_cdns_init(struct sdw_cdns *cdns)
    /* Disable auto bus release */
    val &= ~CDNS_MCP_CONFIG_BUS_REL;

    - /* Multi-master support to be added here */
    + if (cdns->bus.multi_link)
    + /* Set Multi-master mode to take gsync into account */
    + val |= CDNS_MCP_CONFIG_MMASTER;

    /* leave frame delay to hardware default of 0x1F */

    --
    2.20.1
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