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authorJarkko Nikula <jarkko.nikula@linux.intel.com>2018-05-18 11:38:27 +0300
committerLee Jones <lee.jones@linaro.org>2018-06-04 08:44:17 +0100
commit4e93a658576ab115977225c9d0992b97ff19ba8c (patch)
tree723e1ae80778ca53562e625b0a922147d682dd70 /drivers/mfd
parent4eb1d7fcbc80ec3fc2d628ad8ab7324d8837205e (diff)
downloadlinux-4e93a658576ab115977225c9d0992b97ff19ba8c.tar.bz2
mfd: intel-lpss: Fix Intel Cannon Lake LPSS I2C input clock
Intel Cannon Lake PCH has much higher 216 MHz input clock to LPSS I2C than Sunrisepoint which uses 120 MHz. Preliminary information was that both share the same clock rate but actual silicon implements elevated rate for better support for 3.4 MHz high-speed I2C. This incorrect input clock rate results too high I2C bus clock in case ACPI doesn't provide tuned I2C timing parameters since I2C host controller driver calculates them from input clock rate. Fix this by using the correct rate. We still share the same 230 ns SDA hold time value than Sunrisepoint. Cc: stable@vger.kernel.org Fixes: b418bbff36dd ("mfd: intel-lpss: Add Intel Cannonlake PCI IDs") Reported-by: Jian-Hong Pan <jian-hong@endlessm.com> Reported-by: Chris Chiu <chiu@endlessm.com> Reported-by: Daniel Drake <drake@endlessm.com> Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com> Tested-by: Jian-Hong Pan <jian-hong@endlessm.com> Signed-off-by: Lee Jones <lee.jones@linaro.org>
Diffstat (limited to 'drivers/mfd')
-rw-r--r--drivers/mfd/intel-lpss-pci.c25
1 files changed, 15 insertions, 10 deletions
diff --git a/drivers/mfd/intel-lpss-pci.c b/drivers/mfd/intel-lpss-pci.c
index d1c46de89eb4..d9ae983095c5 100644
--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -124,6 +124,11 @@ static const struct intel_lpss_platform_info apl_i2c_info = {
.properties = apl_i2c_properties,
};
+static const struct intel_lpss_platform_info cnl_i2c_info = {
+ .clk_rate = 216000000,
+ .properties = spt_i2c_properties,
+};
+
static const struct pci_device_id intel_lpss_pci_ids[] = {
/* BXT A-Step */
{ PCI_VDEVICE(INTEL, 0x0aac), (kernel_ulong_t)&bxt_i2c_info },
@@ -207,13 +212,13 @@ static const struct pci_device_id intel_lpss_pci_ids[] = {
{ PCI_VDEVICE(INTEL, 0x9daa), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0x9dab), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0x9dfb), (kernel_ulong_t)&spt_info },
- { PCI_VDEVICE(INTEL, 0x9dc5), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0x9dc6), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9dc5), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9dc6), (kernel_ulong_t)&cnl_i2c_info },
{ PCI_VDEVICE(INTEL, 0x9dc7), (kernel_ulong_t)&spt_uart_info },
- { PCI_VDEVICE(INTEL, 0x9de8), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0x9de9), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0x9dea), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0x9deb), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9de8), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9de9), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9dea), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0x9deb), (kernel_ulong_t)&cnl_i2c_info },
/* SPT-H */
{ PCI_VDEVICE(INTEL, 0xa127), (kernel_ulong_t)&spt_uart_info },
{ PCI_VDEVICE(INTEL, 0xa128), (kernel_ulong_t)&spt_uart_info },
@@ -240,10 +245,10 @@ static const struct pci_device_id intel_lpss_pci_ids[] = {
{ PCI_VDEVICE(INTEL, 0xa32b), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0xa37b), (kernel_ulong_t)&spt_info },
{ PCI_VDEVICE(INTEL, 0xa347), (kernel_ulong_t)&spt_uart_info },
- { PCI_VDEVICE(INTEL, 0xa368), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0xa369), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0xa36a), (kernel_ulong_t)&spt_i2c_info },
- { PCI_VDEVICE(INTEL, 0xa36b), (kernel_ulong_t)&spt_i2c_info },
+ { PCI_VDEVICE(INTEL, 0xa368), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0xa369), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0xa36a), (kernel_ulong_t)&cnl_i2c_info },
+ { PCI_VDEVICE(INTEL, 0xa36b), (kernel_ulong_t)&cnl_i2c_info },
{ }
};
MODULE_DEVICE_TABLE(pci, intel_lpss_pci_ids);