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soundwire: slave: add helper to extract slave ID 

Simplify the loop with a helper. The only functionality change is that
we continue the loop even with an ACPI error.

Follow-up patches will build on this change.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Link: https://lore.kernel.org/r/20191022234808.17432-3-pierre-louis.bossart@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2019-10-22 18:48:07 -05:00 committed by Vinod Koul
parent 5bd5453978
commit de5b174b3b
1 changed files with 31 additions and 19 deletions
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50
drivers/soundwire/slave.c
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@ -64,6 +64,36 @@ static int sdw_slave_add(struct sdw_bus *bus,
}
#if IS_ENABLED(CONFIG_ACPI)
static bool find_slave(struct sdw_bus *bus,
struct acpi_device *adev,
struct sdw_slave_id *id)
{
unsigned long long addr;
unsigned int link_id;
acpi_status status;
status = acpi_evaluate_integer(adev->handle,
METHOD_NAME__ADR, NULL, &addr);
if (ACPI_FAILURE(status)) {
dev_err(bus->dev, "_ADR resolution failed: %x\n",
status);
return false;
}
/* Extract link id from ADR, Bit 51 to 48 (included) */
link_id = (addr >> 48) & GENMASK(3, 0);
/* Check for link_id match */
if (link_id != bus->link_id)
return false;
sdw_extract_slave_id(bus, addr, id);
return true;
}
/*
* sdw_acpi_find_slaves() - Find Slave devices in Master ACPI node
* @bus: SDW bus instance
@ -81,29 +111,11 @@ int sdw_acpi_find_slaves(struct sdw_bus *bus)
}
list_for_each_entry(adev, &parent->children, node) {
unsigned long long addr;
struct sdw_slave_id id;
unsigned int link_id;
acpi_status status;
status = acpi_evaluate_integer(adev->handle,
METHOD_NAME__ADR, NULL, &addr);
if (ACPI_FAILURE(status)) {
dev_err(bus->dev, "_ADR resolution failed: %x\n",
status);
return status;
}
/* Extract link id from ADR, Bit 51 to 48 (included) */
link_id = (addr >> 48) & GENMASK(3, 0);
/* Check for link_id match */
if (link_id != bus->link_id)
if (!find_slave(bus, adev, &id))
continue;
sdw_extract_slave_id(bus, addr, &id);
/*
* don't error check for sdw_slave_add as we want to continue
* adding Slaves