From: Pierre-Louis Bossart Date: Mon, 15 May 2023 07:10:35 +0000 (+0800) Subject: soundwire: bus: add new manager callback to deal with peripheral enumeration X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=6bac0d8d1b4c2dd0fc90b64451ffb88a206adda0;p=linux.git soundwire: bus: add new manager callback to deal with peripheral enumeration When a peripheral reports as ATTACHED, the manager may need to follow a programming sequence, e.g. to assign DMA resources and/or assign a command queue for that peripheral. This patch adds an optional callback, which will be invoked every time the peripheral attaches. This might be overkill in some scenarios, and one could argue that this should be invoked only on the first attachment. The bus does not however track this first attachment with any existing state-mirroring variable, and using dev_num_sticky would not work across suspend-resume cycles. Signed-off-by: Pierre-Louis Bossart Reviewed-by: Rander Wang Reviewed-by: Péter Ujfalusi Reviewed-by: Ranjani Sridharan Signed-off-by: Bard Liao Link: https://lore.kernel.org/r/20230515071042.2038-20-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul --- diff --git a/drivers/soundwire/bus.c b/drivers/soundwire/bus.c index 338f4f0b5d0cc..b44f8d0affa67 100644 --- a/drivers/soundwire/bus.c +++ b/drivers/soundwire/bus.c @@ -769,6 +769,9 @@ static int sdw_assign_device_num(struct sdw_slave *slave) /* After xfer of msg, restore dev_num */ slave->dev_num = slave->dev_num_sticky; + if (bus->ops && bus->ops->new_peripheral_assigned) + bus->ops->new_peripheral_assigned(bus, dev_num); + return 0; } diff --git a/include/linux/soundwire/sdw.h b/include/linux/soundwire/sdw.h index ef645de13ae93..c076a3f879b3a 100644 --- a/include/linux/soundwire/sdw.h +++ b/include/linux/soundwire/sdw.h @@ -846,6 +846,7 @@ struct sdw_defer { * @post_bank_switch: Callback for post bank switch * @read_ping_status: Read status from PING frames, reported with two bits per Device. * Bits 31:24 are reserved. + * @new_peripheral_assigned: Callback to handle enumeration of new peripheral. */ struct sdw_master_ops { int (*read_prop)(struct sdw_bus *bus); @@ -860,7 +861,7 @@ struct sdw_master_ops { int (*pre_bank_switch)(struct sdw_bus *bus); int (*post_bank_switch)(struct sdw_bus *bus); u32 (*read_ping_status)(struct sdw_bus *bus); - + void (*new_peripheral_assigned)(struct sdw_bus *bus, int dev_num); }; /**