[PATCH v0 0/2] Fix LPSS clock divider for XPS 9530, 6.8.y backport

[PATCH v0 0/2] Fix LPSS clock divider for XPS 9530, 6.8.y backport

[Aleksandrs Vinarskis]

This is a backport of recently upstreamed fix for XPS 9530 sound issue.
Both apply cleanly to 6.8.y, and could also be cherry-picked from upstream.

Ideally should be applied to all branches where upstream commit
d110858a6925827609d11db8513d76750483ec06 exists (6.8.y) or was backported
(6.7.y) as it adds initial yet incomplete support for this laptop. Patches
for 6.7.y require modification, will be submitted separately.

Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>

Aleksandrs Vinarskis (2):
  mfd: intel-lpss: Switch to generalized quirk table
  mfd: intel-lpss: Introduce QUIRK_CLOCK_DIVIDER_UNITY for XPS 9530

 drivers/mfd/intel-lpss-pci.c | 28 ++++++++++++++++++++--------
 drivers/mfd/intel-lpss.c     |  9 ++++++++-
 drivers/mfd/intel-lpss.h     | 14 +++++++++++++-
 3 files changed, 41 insertions(+), 10 deletions(-)

-- 
2.40.1

[PATCH v0 1/2] mfd: intel-lpss: Switch to generalized quirk table

[Aleksandrs Vinarskis]

commit ac9538f6007e1c80f1b8a62db7ecc391b4d78ae5 upstream.

Introduce generic quirk table, and port existing walkaround for select
Microsoft devices to it. This is a preparation for
QUIRK_CLOCK_DIVIDER_UNITY.

Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20231221185142.9224-2-alex.vinarskis@gmail.com
Signed-off-by: Lee Jones <lee@kernel.org>
---
 drivers/mfd/intel-lpss-pci.c | 23 +++++++++++++++--------
 drivers/mfd/intel-lpss.c     |  2 +-
 drivers/mfd/intel-lpss.h     |  9 ++++++++-
 3 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index 4621d3950b8f..07713a2f694f 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -23,12 +23,17 @@
 
 #include "intel-lpss.h"
 
-/* Some DSDTs have an unused GEXP ACPI device conflicting with I2C4 resources */
-static const struct pci_device_id ignore_resource_conflicts_ids[] = {
-	/* Microsoft Surface Go (version 1) I2C4 */
-	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x9d64, 0x152d, 0x1182), },
-	/* Microsoft Surface Go 2 I2C4 */
-	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x9d64, 0x152d, 0x1237), },
+static const struct pci_device_id quirk_ids[] = {
+	{
+		/* Microsoft Surface Go (version 1) I2C4 */
+		PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x9d64, 0x152d, 0x1182),
+		.driver_data = QUIRK_IGNORE_RESOURCE_CONFLICTS,
+	},
+	{
+		/* Microsoft Surface Go 2 I2C4 */
+		PCI_DEVICE_SUB(PCI_VENDOR_ID_INTEL, 0x9d64, 0x152d, 0x1237),
+		.driver_data = QUIRK_IGNORE_RESOURCE_CONFLICTS,
+	},
 	{ }
 };
 
@@ -36,6 +41,7 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev,
 				const struct pci_device_id *id)
 {
 	const struct intel_lpss_platform_info *data = (void *)id->driver_data;
+	const struct pci_device_id *quirk_pci_info;
 	struct intel_lpss_platform_info *info;
 	int ret;
 
@@ -55,8 +61,9 @@ static int intel_lpss_pci_probe(struct pci_dev *pdev,
 	info->mem = pci_resource_n(pdev, 0);
 	info->irq = pci_irq_vector(pdev, 0);
 
-	if (pci_match_id(ignore_resource_conflicts_ids, pdev))
-		info->ignore_resource_conflicts = true;
+	quirk_pci_info = pci_match_id(quirk_ids, pdev);
+	if (quirk_pci_info)
+		info->quirks = quirk_pci_info->driver_data;
 
 	pdev->d3cold_delay = 0;
 
diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
index eff423f7dd28..aafa0da5f8db 100644
--- a/drivers/mfd/intel-lpss.c
+++ b/drivers/mfd/intel-lpss.c
@@ -412,7 +412,7 @@ int intel_lpss_probe(struct device *dev,
 		return ret;
 
 	lpss->cell->swnode = info->swnode;
-	lpss->cell->ignore_resource_conflicts = info->ignore_resource_conflicts;
+	lpss->cell->ignore_resource_conflicts = info->quirks & QUIRK_IGNORE_RESOURCE_CONFLICTS;
 
 	intel_lpss_init_dev(lpss);
 
diff --git a/drivers/mfd/intel-lpss.h b/drivers/mfd/intel-lpss.h
index c1d72b117ed5..2fa9ef916258 100644
--- a/drivers/mfd/intel-lpss.h
+++ b/drivers/mfd/intel-lpss.h
@@ -11,16 +11,23 @@
 #ifndef __MFD_INTEL_LPSS_H
 #define __MFD_INTEL_LPSS_H
 
+#include <linux/bits.h>
 #include <linux/pm.h>
 
+/*
+ * Some DSDTs have an unused GEXP ACPI device conflicting with I2C4 resources.
+ * Set to ignore resource conflicts with ACPI declared SystemMemory regions.
+ */
+#define QUIRK_IGNORE_RESOURCE_CONFLICTS BIT(0)
+
 struct device;
 struct resource;
 struct software_node;
 
 struct intel_lpss_platform_info {
 	struct resource *mem;
-	bool ignore_resource_conflicts;
 	int irq;
+	unsigned int quirks;
 	unsigned long clk_rate;
 	const char *clk_con_id;
 	const struct software_node *swnode;
-- 
2.40.1

[PATCH v0 2/2] mfd: intel-lpss: Introduce QUIRK_CLOCK_DIVIDER_UNITY for XPS 9530

[Aleksandrs Vinarskis]

commit 1d8c51ed2ddcc4161e6496cf14fcd83921c50ec8 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>
---
 drivers/mfd/intel-lpss-pci.c | 5 +++++
 drivers/mfd/intel-lpss.c     | 7 +++++++
 drivers/mfd/intel-lpss.h     | 5 +++++
 3 files changed, 17 insertions(+)

diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index 07713a2f694f..8c00e0c695c5 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -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,
+	},
 	{ }
 };
 
diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c
index aafa0da5f8db..2a9018112dfc 100644
--- a/drivers/mfd/intel-lpss.c
+++ b/drivers/mfd/intel-lpss.c
@@ -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);
diff --git a/drivers/mfd/intel-lpss.h b/drivers/mfd/intel-lpss.h
index 2fa9ef916258..6f8f668f4c6f 100644
--- a/drivers/mfd/intel-lpss.h
+++ b/drivers/mfd/intel-lpss.h
@@ -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;
-- 
2.40.1

Re: [PATCH v0 0/2] Fix LPSS clock divider for XPS 9530, 6.8.y backport

[Greg KH]

On Sun, Mar 17, 2024 at 01:53:58AM +0100, Aleksandrs Vinarskis wrote:
> This is a backport of recently upstreamed fix for XPS 9530 sound issue.
> Both apply cleanly to 6.8.y, and could also be cherry-picked from upstream.
> 
> Ideally should be applied to all branches where upstream commit
> d110858a6925827609d11db8513d76750483ec06 exists (6.8.y) or was backported
> (6.7.y) as it adds initial yet incomplete support for this laptop. Patches
> for 6.7.y require modification, will be submitted separately.
> 
> Signed-off-by: Aleksandrs Vinarskis <alex.vinarskis@gmail.com>

All now queued up, thanks.

greg k-h