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soundwire: cadence: multi-link support

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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>
Link: https://lore.kernel.org/r/20200317163329.25501-17-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-03-17 11:33:28 -05:00 committed by Vinod Koul
parent b17350e403
commit 2c800e3ba7
1 changed files with 10 additions and 2 deletions
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12
drivers/soundwire/cadence_master.c
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@ -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 */