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mfd: intel-lpss: Fix Intel Cannon Lake LPSS I2C input clock

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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: [email protected]
Fixes: b418bbff36 ("mfd: intel-lpss: Add Intel Cannonlake PCI IDs")
Reported-by: Jian-Hong Pan <[email protected]>
Reported-by: Chris Chiu <[email protected]>
Reported-by: Daniel Drake <[email protected]>
Signed-off-by: Jarkko Nikula <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Acked-by: Mika Westerberg <[email protected]>
Tested-by: Jian-Hong Pan <[email protected]>
Signed-off-by: Lee Jones <[email protected]>
This commit is contained in:
Jarkko Nikula 2018-05-18 11:38:27 +03:00 • committed by Lee Jones
commit 4e93a65857
1 changed files with 15 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

25
drivers/mfd/intel-lpss-pci.c
View file

@ -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);