linux-kernel - [PATCH] mfd: intel-lpss: Add default I2C device properties for Apollo Lake

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Date:   Mon, 12 Sep 2016 14:41:33 +0300
From:   Jarkko Nikula <jarkko.nikula@...ux.intel.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lee Jones <lee.jones@...aro.org>,
        Paul Liu <paul.liu@...onical.com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>
Subject: [PATCH] mfd: intel-lpss: Add default I2C device properties for Apollo Lake

Default I2C device properties for Intel Broxton, especially SDA hold time
may not be enough on Intel Apollo Lake. These properties are used in case
we don't get timing parameters from ACPI.

The default SDA hold time for Broxton may fail with arbitration lost errors
on Apollo Lake:

  i2c_designware i2c_designware.1: i2c_dw_handle_tx_abort: lost arbitration

Fix this by using different default device properties on Apollo Lake than
Broxton.

Reported-by: Paul Liu <paul.liu@...onical.com>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=156181
Signed-off-by: Jarkko Nikula <jarkko.nikula@...ux.intel.com>
---
Hi Paul. This is the same patch I shared you offline but rebased on top
of mfd.git, essentially on top of commit 19063e1b0aaa ("mfd: lpss: Add
Intel Kaby Lake PCH-H PCI IDs") and commit log a little bit edited.
---
 drivers/mfd/intel-lpss-acpi.c | 14 +++++++++++++-
 drivers/mfd/intel-lpss-pci.c  | 28 ++++++++++++++++++++--------
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/mfd/intel-lpss-acpi.c b/drivers/mfd/intel-lpss-acpi.c
index 7ddc4a9563ea..6bf8d643d942 100644
--- a/drivers/mfd/intel-lpss-acpi.c
+++ b/drivers/mfd/intel-lpss-acpi.c
@@ -52,6 +52,18 @@ static const struct intel_lpss_platform_info bxt_i2c_info = {
 	.properties = bxt_i2c_properties,
 };
 
+static struct property_entry apl_i2c_properties[] = {
+	PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
+	PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
+	PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
+	{ },
+};
+
+static const struct intel_lpss_platform_info apl_i2c_info = {
+	.clk_rate = 133000000,
+	.properties = apl_i2c_properties,
+};
+
 static const struct acpi_device_id intel_lpss_acpi_ids[] = {
 	/* SPT */
 	{ "INT3446", (kernel_ulong_t)&spt_i2c_info },
@@ -61,7 +73,7 @@ static const struct acpi_device_id intel_lpss_acpi_ids[] = {
 	{ "80860ABC", (kernel_ulong_t)&bxt_info },
 	{ "80860AC2", (kernel_ulong_t)&bxt_info },
 	/* APL */
-	{ "80865AAC", (kernel_ulong_t)&bxt_i2c_info },
+	{ "80865AAC", (kernel_ulong_t)&apl_i2c_info },
 	{ "80865ABC", (kernel_ulong_t)&bxt_info },
 	{ "80865AC2", (kernel_ulong_t)&bxt_info },
 	{ }
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index d19569a0f2f9..3228fd182a99 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -111,6 +111,18 @@ static const struct intel_lpss_platform_info bxt_i2c_info = {
 	.properties = bxt_i2c_properties,
 };
 
+static struct property_entry apl_i2c_properties[] = {
+	PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 207),
+	PROPERTY_ENTRY_U32("i2c-sda-falling-time-ns", 171),
+	PROPERTY_ENTRY_U32("i2c-scl-falling-time-ns", 208),
+	{ },
+};
+
+static const struct intel_lpss_platform_info apl_i2c_info = {
+	.clk_rate = 133000000,
+	.properties = apl_i2c_properties,
+};
+
 static const struct intel_lpss_platform_info kbl_info = {
 	.clk_rate = 120000000,
 };
@@ -159,14 +171,14 @@ static const struct pci_device_id intel_lpss_pci_ids[] = {
 	{ PCI_VDEVICE(INTEL, 0x1aee), (kernel_ulong_t)&bxt_uart_info },
 
 	/* APL */
-	{ PCI_VDEVICE(INTEL, 0x5aac), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5aae), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5ab0), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5ab2), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5ab4), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5ab6), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5ab8), (kernel_ulong_t)&bxt_i2c_info },
-	{ PCI_VDEVICE(INTEL, 0x5aba), (kernel_ulong_t)&bxt_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5aac), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5aae), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5ab0), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5ab2), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5ab4), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5ab6), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5ab8), (kernel_ulong_t)&apl_i2c_info },
+	{ PCI_VDEVICE(INTEL, 0x5aba), (kernel_ulong_t)&apl_i2c_info },
 	{ PCI_VDEVICE(INTEL, 0x5abc), (kernel_ulong_t)&bxt_uart_info },
 	{ PCI_VDEVICE(INTEL, 0x5abe), (kernel_ulong_t)&bxt_uart_info },
 	{ PCI_VDEVICE(INTEL, 0x5ac0), (kernel_ulong_t)&bxt_uart_info },
-- 
2.9.3