soundwire: cadence: multi-link support (2c800e3b) · Commits · 戴 / test

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>

drivers/soundwire/cadence_master.c

+10 −2

Original line number	Diff line number	Diff line
		@@ -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 */

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