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soundwire: bus: export broadcast read/write capability for tests

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Provide prototype and export symbol to enable tests. The bus lock is
handled externally to avoid conflicts e.g. between kernel-generated
traffic and test traffic.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>
Link: https://lore.kernel.org/r/20200908134521.6781-7-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2020-09-08 21:45:20 +08:00 committed by Vinod Koul
parent 38edbfae6c
commit a350aff45b
2 changed files with 53 additions and 7 deletions
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56
drivers/soundwire/bus.c
View File

@ -255,6 +255,21 @@ static int sdw_reset_page(struct sdw_bus *bus, u16 dev_num)
return ret;
}
static int sdw_transfer_unlocked(struct sdw_bus *bus, struct sdw_msg *msg)
{
int ret;
ret = do_transfer(bus, msg);
if (ret != 0 && ret != -ENODATA)
dev_err(bus->dev, "trf on Slave %d failed:%d\n",
msg->dev_num, ret);
if (msg->page)
sdw_reset_page(bus, msg->dev_num);
return ret;
}
/**
* sdw_transfer() - Synchronous transfer message to a SDW Slave device
* @bus: SDW bus
@ -266,13 +281,7 @@ int sdw_transfer(struct sdw_bus *bus, struct sdw_msg *msg)
mutex_lock(&bus->msg_lock);
ret = do_transfer(bus, msg);
if (ret != 0 && ret != -ENODATA)
dev_err(bus->dev, "trf on Slave %d failed:%d\n",
msg->dev_num, ret);
if (msg->page)
sdw_reset_page(bus, msg->dev_num);
ret = sdw_transfer_unlocked(bus, msg);
mutex_unlock(&bus->msg_lock);
@ -428,6 +437,39 @@ sdw_bwrite_no_pm(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
return sdw_transfer(bus, &msg);
}
int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr)
{
struct sdw_msg msg;
u8 buf;
int ret;
ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
SDW_MSG_FLAG_READ, &buf);
if (ret)
return ret;
ret = sdw_transfer_unlocked(bus, &msg);
if (ret < 0)
return ret;
return buf;
}
EXPORT_SYMBOL(sdw_bread_no_pm_unlocked);
int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value)
{
struct sdw_msg msg;
int ret;
ret = sdw_fill_msg(&msg, NULL, addr, 1, dev_num,
SDW_MSG_FLAG_WRITE, &value);
if (ret)
return ret;
return sdw_transfer_unlocked(bus, &msg);
}
EXPORT_SYMBOL(sdw_bwrite_no_pm_unlocked);
static int
sdw_read_no_pm(struct sdw_slave *slave, u32 addr)
{

4
drivers/soundwire/bus.h
View File

@ -168,6 +168,10 @@ sdw_update(struct sdw_slave *slave, u32 addr, u8 mask, u8 val)
return sdw_write(slave, addr, tmp);
}
/* broadcast read/write for tests */
int sdw_bread_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr);
int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 value);
/*
* At the moment we only track Master-initiated hw_reset.
* Additional fields can be added as needed