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authorMika Westerberg <mika.westerberg@linux.intel.com>2015-11-30 17:11:42 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-12-07 02:29:24 +0100
commit028af5941dd870afd5eb6a95c39f25564dcca79a (patch)
treecf281d7af22c25e1effc747149d7c7b7755ae894 /drivers/mfd/intel-lpss-pci.c
parente15ad2154b6166804fc04487e0398c9aef9e7c97 (diff)
mfd: intel-lpss: Pass SDA hold time to I2C host controller driver
Intel Skylake the LPSS I2C pad circuit has internal delays that require programming non-zero SDA hold time for the I2C host controller. If this is not done communication to slave devices may fail with arbitration lost errors like the one seen below taken from Lenovo Yoga 900: i2c_hid i2c-SYNA2B29:00: Fetching the HID descriptor i2c_hid i2c-SYNA2B29:00: __i2c_hid_command: cmd=20 00 i2c_designware i2c_designware.1: i2c_dw_handle_tx_abort: lost arbitration To fix this we follow what the Windows driver is doing and pass the default SDA hold time of 230 ns to all Intel Skylake host controllers. This still allows the platform to override these values by passing special ACPI methods SSCN and FMCN. Reported-by: Kevin Fenzi <kevin@scrye.com> Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/mfd/intel-lpss-pci.c')
-rw-r--r--drivers/mfd/intel-lpss-pci.c31
1 files changed, 23 insertions, 8 deletions
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index 5bfdfccbb9a1..a67748098213 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -17,6 +17,7 @@
#include <linux/pci.h>
#include <linux/pm.h>
#include <linux/pm_runtime.h>
+#include <linux/property.h>
#include "intel-lpss.h"
@@ -65,6 +66,20 @@ static const struct intel_lpss_platform_info spt_info = {
.clk_rate = 120000000,
};
+static struct property_entry spt_i2c_properties[] = {
+ PROPERTY_ENTRY_U32("i2c-sda-hold-time-ns", 230),
+ { },
+};
+
+static struct property_set spt_i2c_pset = {
+ .properties = spt_i2c_properties,
+};
+
+static const struct intel_lpss_platform_info spt_i2c_info = {
+ .clk_rate = 120000000,
+ .pset = &spt_i2c_pset,
+};
+
static const struct intel_lpss_platform_info spt_uart_info = {
.clk_rate = 120000000,
.clk_con_id = "baudclk",
@@ -121,20 +136,20 @@ static const struct pci_device_id intel_lpss_pci_ids[] = {
{ PCI_VDEVICE(INTEL, 0x9d28), (kernel_ulong_t)&spt_uart_info },
{ PCI_VDEVICE(INTEL, 0x9d29), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0x9d2a), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d60), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d61), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d62), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d63), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d64), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9d65), (kernel_ulong_t)&spt_info },
+ { PCI_VDEVICE(INTEL, 0x9d60), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9d61), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9d62), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9d63), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9d64), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9d65), (kernel_ulong_t)&spt_i2c_info },
{ PCI_VDEVICE(INTEL, 0x9d66), (kernel_ulong_t)&spt_uart_info },
/* SPT-H */
{ PCI_VDEVICE(INTEL, 0xa127), (kernel_ulong_t)&spt_uart_info },
{ PCI_VDEVICE(INTEL, 0xa128), (kernel_ulong_t)&spt_uart_info },
{ PCI_VDEVICE(INTEL, 0xa129), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0xa12a), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0xa160), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0xa161), (kernel_ulong_t)&spt_info },
+ { PCI_VDEVICE(INTEL, 0xa160), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0xa161), (kernel_ulong_t)&spt_i2c_info },
{ PCI_VDEVICE(INTEL, 0xa166), (kernel_ulong_t)&spt_uart_info },
{ }
};