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soundwire: intel: filter SoundWire controller device search

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The convention is that the SoundWire controller device is a child of
the HDAudio controller. However there can be more than one child
exposed in the DSDT table, and the current namespace walk returns the
last (incorrect) device.

Intel documentation states that bits 28..31 of the _ADR field
represent the link type, with SoundWire assigned the value 4.

Add a filter and terminate early when a valid _ADR is provided,
otherwise keep iterating to find the next child.

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Pierre-Louis Bossart 2019-05-22 14:47:17 -05:00 committed by Vinod Koul
parent 18de65d9e7
commit 6f11586f48
1 changed files with 20 additions and 1 deletions
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21
drivers/soundwire/intel_init.c
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@ -14,6 +14,7 @@
#include <linux/soundwire/sdw_intel.h>
#include "intel.h"
#define SDW_LINK_TYPE 4 /* from Intel ACPI documentation */
#define SDW_MAX_LINKS 4
#define SDW_SHIM_LCAP 0x0
#define SDW_SHIM_BASE 0x2C000
@ -150,6 +151,12 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
{
struct sdw_intel_res *res = cdata;
struct acpi_device *adev;
acpi_status status;
u64 adr;
status = acpi_evaluate_integer(handle, METHOD_NAME__ADR, NULL, &adr);
if (ACPI_FAILURE(status))
return AE_OK; /* keep going */
if (acpi_bus_get_device(handle, &adev)) {
pr_err("%s: Couldn't find ACPI handle\n", __func__);
@ -157,7 +164,19 @@ static acpi_status sdw_intel_acpi_cb(acpi_handle handle, u32 level,
}
res->handle = handle;
return AE_OK;
/*
* On some Intel platforms, multiple children of the HDAS
* device can be found, but only one of them is the SoundWire
* controller. The SNDW device is always exposed with
* Name(_ADR, 0x40000000), with bits 31..28 representing the
* SoundWire link so filter accordingly
*/
if ((adr & GENMASK(31, 28)) >> 28 != SDW_LINK_TYPE)
return AE_OK; /* keep going */
/* device found, stop namespace walk */
return AE_CTRL_TERMINATE;
}
/**