Merge tag 'intel-pinctrl-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pinctrl/intel into devel

intel-pinctrl for v5.2-1

Non-critical fixes for Intel Baytrail and Intel Cedarfork.
Couple of fixes for all pinctrl-intel based drivers with regard to
IRQ handling, i.e. moving PM calls to noirq level to avoid IRQ lose
and restore ownership of pins to prevent IRQ masking side effect.

The following is an automated git shortlog grouped by driver:

baytrail:
 -  Fix potential NULL pointer dereference

cedarfork:
 -  Update pin names according to v1.13c

intel:
 -  Increase readability of intel_gpio_update_pad_mode()
 -  Retain HOSTSW_OWN for requested gpio pin
 -  move gpio suspend/resume to noirq phase

4 files changed, 78 insertions, 19 deletions

diff --git a/drivers/pinctrl/intel/pinctrl-baytrail.c b/drivers/pinctrl/intel/pinctrl-baytrail.c
index 241384ead4ed..18d9ad504194 100644
--- a/drivers/pinctrl/intel/pinctrl-baytrail.c
+++ b/drivers/pinctrl/intel/pinctrl-baytrail.c
@@ -1710,6 +1710,8 @@ static int byt_gpio_probe(struct byt_gpio *vg)
 #ifdef CONFIG_PM_SLEEP
 	vg->saved_context = devm_kcalloc(&vg->pdev->dev, gc->ngpio,
 				       sizeof(*vg->saved_context), GFP_KERNEL);
+	if (!vg->saved_context)
+		return -ENOMEM;
 #endif
 	ret = devm_gpiochip_add_data(&vg->pdev->dev, gc, vg);
 	if (ret) {
diff --git a/drivers/pinctrl/intel/pinctrl-cedarfork.c b/drivers/pinctrl/intel/pinctrl-cedarfork.c
index b7d632f1dbf6..aa6f9040d3d8 100644
--- a/drivers/pinctrl/intel/pinctrl-cedarfork.c
+++ b/drivers/pinctrl/intel/pinctrl-cedarfork.c
@@ -91,13 +91,13 @@ static const struct pinctrl_pin_desc cdf_pins[] = {
 	PINCTRL_PIN(43, "MEMTRIP_N"),
 	PINCTRL_PIN(44, "UART0_RXD"),
 	PINCTRL_PIN(45, "UART0_TXD"),
-	PINCTRL_PIN(46, "UART1_RXD"),
-	PINCTRL_PIN(47, "UART1_TXD"),
+	PINCTRL_PIN(46, "GBE_UART_RXD"),
+	PINCTRL_PIN(47, "GBE_UART_TXD"),
 	/* WEST01 */
 	PINCTRL_PIN(48, "GBE_GPIO13"),
 	PINCTRL_PIN(49, "AUX_PWR"),
-	PINCTRL_PIN(50, "CPU_GP_2"),
-	PINCTRL_PIN(51, "CPU_GP_3"),
+	PINCTRL_PIN(50, "UART0_RTS"),
+	PINCTRL_PIN(51, "UART0_CTS"),
 	PINCTRL_PIN(52, "FAN_PWM_0"),
 	PINCTRL_PIN(53, "FAN_PWM_1"),
 	PINCTRL_PIN(54, "FAN_PWM_2"),
@@ -201,8 +201,8 @@ static const struct pinctrl_pin_desc cdf_pins[] = {
 	/* WESTF */
 	PINCTRL_PIN(145, "NAC_RMII_CLK"),
 	PINCTRL_PIN(146, "NAC_RGMII_CLK"),
-	PINCTRL_PIN(147, "NAC_SPARE0"),
-	PINCTRL_PIN(148, "NAC_SPARE1"),
+	PINCTRL_PIN(147, "NAC_GBE_SMB_CLK_TX_N2S"),
+	PINCTRL_PIN(148, "NAC_GBE_SMB_DATA_TX_N2S"),
 	PINCTRL_PIN(149, "NAC_SPARE2"),
 	PINCTRL_PIN(150, "NAC_INIT_SX_WAKE_N"),
 	PINCTRL_PIN(151, "NAC_GBE_GPIO0_S2N"),
@@ -219,8 +219,8 @@ static const struct pinctrl_pin_desc cdf_pins[] = {
 	PINCTRL_PIN(162, "NAC_NCSI_TXD1"),
 	PINCTRL_PIN(163, "NAC_NCSI_ARB_OUT"),
 	PINCTRL_PIN(164, "NAC_NCSI_OE_N"),
-	PINCTRL_PIN(165, "NAC_GBE_SMB_CLK"),
-	PINCTRL_PIN(166, "NAC_GBE_SMB_DATA"),
+	PINCTRL_PIN(165, "NAC_GBE_SMB_CLK_RX_S2N"),
+	PINCTRL_PIN(166, "NAC_GBE_SMB_DATA_RX_S2N"),
 	PINCTRL_PIN(167, "NAC_GBE_SMB_ALRT_N"),
 	/* EAST2 */
 	PINCTRL_PIN(168, "USB_OC0_N"),
@@ -232,7 +232,7 @@ static const struct pinctrl_pin_desc cdf_pins[] = {
 	PINCTRL_PIN(174, "GBE_GPIO5"),
 	PINCTRL_PIN(175, "GBE_GPIO6"),
 	PINCTRL_PIN(176, "GBE_GPIO7"),
-	PINCTRL_PIN(177, "GBE_GPIO8"),
+	PINCTRL_PIN(177, "SPI_TPM_CS_N"),
 	PINCTRL_PIN(178, "GBE_GPIO9"),
 	PINCTRL_PIN(179, "GBE_GPIO10"),
 	PINCTRL_PIN(180, "GBE_GPIO11"),
diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 3b1818184207..d7acbb79cdf7 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -81,6 +81,7 @@ struct intel_pad_context {
 
 struct intel_community_context {
 	u32 *intmask;
+	u32 *hostown;
 };
 
 struct intel_pinctrl_context {
@@ -1284,7 +1285,7 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
 
 	for (i = 0; i < pctrl->ncommunities; i++) {
 		struct intel_community *community = &pctrl->communities[i];
-		u32 *intmask;
+		u32 *intmask, *hostown;
 
 		intmask = devm_kcalloc(pctrl->dev, community->ngpps,
 				       sizeof(*intmask), GFP_KERNEL);
@@ -1292,6 +1293,13 @@ static int intel_pinctrl_pm_init(struct intel_pinctrl *pctrl)
 			return -ENOMEM;
 
 		communities[i].intmask = intmask;
+
+		hostown = devm_kcalloc(pctrl->dev, community->ngpps,
+				       sizeof(*hostown), GFP_KERNEL);
+		if (!hostown)
+			return -ENOMEM;
+
+		communities[i].hostown = hostown;
 	}
 
 	pctrl->context.pads = pads;
@@ -1466,7 +1474,7 @@ static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int
 	return false;
 }
 
-int intel_pinctrl_suspend(struct device *dev)
+int intel_pinctrl_suspend_noirq(struct device *dev)
 {
 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
 	struct intel_community_context *communities;
@@ -1501,11 +1509,15 @@ int intel_pinctrl_suspend(struct device *dev)
 		base = community->regs + community->ie_offset;
 		for (gpp = 0; gpp < community->ngpps; gpp++)
 			communities[i].intmask[gpp] = readl(base + gpp * 4);
+
+		base = community->regs + community->hostown_offset;
+		for (gpp = 0; gpp < community->ngpps; gpp++)
+			communities[i].hostown[gpp] = readl(base + gpp * 4);
 	}
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
+EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq);
 
 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
 {
@@ -1527,7 +1539,32 @@ static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
 	}
 }
 
-int intel_pinctrl_resume(struct device *dev)
+static u32
+intel_gpio_is_requested(struct gpio_chip *chip, int base, unsigned int size)
+{
+	u32 requested = 0;
+	unsigned int i;
+
+	for (i = 0; i < size; i++)
+		if (gpiochip_is_requested(chip, base + i))
+			requested |= BIT(i);
+
+	return requested;
+}
+
+static u32
+intel_gpio_update_pad_mode(void __iomem *hostown, u32 mask, u32 value)
+{
+	u32 curr, updated;
+
+	curr = readl(hostown);
+	updated = (curr & ~mask) | (value & mask);
+	writel(updated, hostown);
+
+	return curr;
+}
+
+int intel_pinctrl_resume_noirq(struct device *dev)
 {
 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
 	const struct intel_community_context *communities;
@@ -1585,11 +1622,30 @@ int intel_pinctrl_resume(struct device *dev)
 			dev_dbg(dev, "restored mask %d/%u %#08x\n", i, gpp,
 				readl(base + gpp * 4));
 		}
+
+		base = community->regs + community->hostown_offset;
+		for (gpp = 0; gpp < community->ngpps; gpp++) {
+			const struct intel_padgroup *padgrp = &community->gpps[gpp];
+			u32 requested = 0, value = 0;
+			u32 saved = communities[i].hostown[gpp];
+
+			if (padgrp->gpio_base < 0)
+				continue;
+
+			requested = intel_gpio_is_requested(&pctrl->chip,
+					padgrp->gpio_base, padgrp->size);
+			value = intel_gpio_update_pad_mode(base + gpp * 4,
+					requested, saved);
+			if ((value ^ saved) & requested) {
+				dev_warn(dev, "restore hostown %d/%u %#8x->%#8x\n",
+					i, gpp, value, saved);
+			}
+		}
 	}
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
+EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq);
 #endif
 
 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@linux.intel.com>");
diff --git a/drivers/pinctrl/intel/pinctrl-intel.h b/drivers/pinctrl/intel/pinctrl-intel.h
index b8a07d37d18f..a8e958f1dcf5 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.h
+++ b/drivers/pinctrl/intel/pinctrl-intel.h
@@ -177,13 +177,14 @@ int intel_pinctrl_probe_by_hid(struct platform_device *pdev);
 int intel_pinctrl_probe_by_uid(struct platform_device *pdev);
 
 #ifdef CONFIG_PM_SLEEP
-int intel_pinctrl_suspend(struct device *dev);
-int intel_pinctrl_resume(struct device *dev);
+int intel_pinctrl_suspend_noirq(struct device *dev);
+int intel_pinctrl_resume_noirq(struct device *dev);
 #endif
 
-#define INTEL_PINCTRL_PM_OPS(_name)						  \
-const struct dev_pm_ops _name = {						  \
-	SET_LATE_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend, intel_pinctrl_resume) \
+#define INTEL_PINCTRL_PM_OPS(_name)					\
+const struct dev_pm_ops _name = {					\
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend_noirq,	\
+				      intel_pinctrl_resume_noirq)	\
 }
 
 #endif /* PINCTRL_INTEL_H */