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media: atomisp: properly parse CLK PMIC on newer devices

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Newer devices don't place the PMIC CLK line inside an EFI
var. Instead, those are found at the _PR0 table.

Add a parser for it, using info stored via the DSDT table.

Tested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
This commit is contained in:
Mauro Carvalho Chehab 2020-06-20 12:25:10 +02:00
parent d6697288d8
commit e2c5794238
1 changed files with 64 additions and 2 deletions
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66
drivers/staging/media/atomisp/pci/atomisp_gmin_platform.c
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@ -444,6 +444,61 @@ static int gmin_i2c_write(struct device *dev, u16 i2c_addr, u8 reg,
return ret;
}
static int atomisp_get_acpi_power(struct device *dev, acpi_handle handle)
{
char name[5];
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
struct acpi_buffer b_name = { sizeof(name), name };
union acpi_object *package, *element;
acpi_handle rhandle;
acpi_status status;
int clock_num = -1;
int i;
status = acpi_evaluate_object(handle, "_PR0", NULL, &buffer);
if (!ACPI_SUCCESS(status))
return -1;
package = buffer.pointer;
if (!buffer.length || !package
|| package->type != ACPI_TYPE_PACKAGE
|| !package->package.count)
goto fail;
for (i = 0; i < package->package.count; i++) {
element = &package->package.elements[i];
if (element->type != ACPI_TYPE_LOCAL_REFERENCE)
continue;
rhandle = element->reference.handle;
if (!rhandle)
goto fail;
acpi_get_name(rhandle, ACPI_SINGLE_NAME, &b_name);
dev_dbg(dev, "Found PM resource '%s'\n", name);
if (strlen(name) == 4 && !strncmp(name, "CLK", 3)) {
if (name[3] >= '0' && name[3] <= '4')
clock_num = name[3] - '0';
#if 0
/*
* We could abort here, but let's parse all resources,
* as this is helpful for debugging purposes
*/
if (clock_num >= 0)
break;
#endif
}
}
fail:
ACPI_FREE(buffer.pointer);
return clock_num;
}
static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev)
{
struct i2c_client *power = NULL, *client = v4l2_get_subdevdata(subdev);
@ -451,7 +506,7 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev)
struct gmin_subdev *gs;
acpi_handle handle;
struct device *dev;
int i, ret, clock_num;
int i, ret, clock_num = -1;
if (!client)
return NULL;
@ -557,7 +612,14 @@ static struct gmin_subdev *gmin_subdev_add(struct v4l2_subdev *subdev)
* is a power resource already, falling back to the EFI vars detection
* otherwise.
*/
clock_num = gmin_get_var_int(dev, false, "CamClk", -1);
/* Try first to use ACPI to get the clock resource */
if (acpi_device_power_manageable(adev))
clock_num = atomisp_get_acpi_power(dev, handle);
/* Fall-back use EFI and/or DMI match */
if (clock_num < 0)
clock_num = gmin_get_var_int(dev, false, "CamClk", 0);
if (clock_num < 0 || clock_num > MAX_CLK_COUNT) {
dev_err(dev, "Invalid clock number\n");