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mfd: intel-lpss: Introduce QUIRK_CLOCK_DIVIDER_UNITY for XPS 9530 

commit 1d8c51ed2d upstream.

Some devices (eg. Dell XPS 9530, 2023) due to a firmware bug have a
misconfigured clock divider, which should've been 1:1. This introduces
quirk which conditionally re-configures the clock divider to 1:1.

Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231221185142.9224-3-alex.vinarskis@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksandrs Vinarskis 2023-12-21 19:51:42 +01:00 committed by Greg Kroah-Hartman
parent e19a5ef50d
commit 6c12226d9f
3 changed files with 17 additions and 0 deletions
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5
drivers/mfd/intel-lpss-pci.c
View File

@ -34,6 +34,11 @@ static const struct pci_device_id quirk_ids[] = {
PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x9d64, 0x152d, 0x1237),
.driver_data = QUIRK_IGNORE_RESOURCE_CONFLICTS,
},
{
/* Dell XPS 9530 (2023) */
PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x51fb, 0x1028, 0x0beb),
.driver_data = QUIRK_CLOCK_DIVIDER_UNITY,
},
{ }
};

7
drivers/mfd/intel-lpss.c
View File

@ -300,6 +300,7 @@ static int intel_lpss_register_clock_divider(struct intel_lpss *lpss,
{
char name[32];
struct clk *tmp = *clk;
int ret;
snprintf(name, sizeof(name), "%s-enable", devname);
tmp = clk_register_gate(NULL, name, __clk_get_name(tmp), 0,
@ -316,6 +317,12 @@ static int intel_lpss_register_clock_divider(struct intel_lpss *lpss,
return PTR_ERR(tmp);
*clk = tmp;
if (lpss->info->quirks & QUIRK_CLOCK_DIVIDER_UNITY) {
ret = clk_set_rate(tmp, lpss->info->clk_rate);
if (ret)
return ret;
}
snprintf(name, sizeof(name), "%s-update", devname);
tmp = clk_register_gate(NULL, name, __clk_get_name(tmp),
CLK_SET_RATE_PARENT, lpss->priv, 31, 0, NULL);

5
drivers/mfd/intel-lpss.h
View File

@ -19,6 +19,11 @@
* Set to ignore resource conflicts with ACPI declared SystemMemory regions.
*/
#define QUIRK_IGNORE_RESOURCE_CONFLICTS BIT(0)
/*
* Some devices have misconfigured clock divider due to a firmware bug.
* Set this to force the clock divider to 1:1 ratio.
*/
#define QUIRK_CLOCK_DIVIDER_UNITY BIT(1)
struct device;
struct resource;