diff options
| author | Subrata Banik <subrata.banik@intel.com> | 2018-09-27 19:27:39 +0530 |
|---|---|---|
| committer | Subrata Banik <subrata.banik@intel.com> | 2018-10-03 04:50:37 +0000 |
| commit | 7d8c0c2c588fea989691d95bbbd6bcf9137cc675 (patch) | |
| tree | afbcaeaa79679db09f2809daf98ce0f94d612c30 | |
| parent | cac2217c938dd615080b52405fc4b348399d4cb5 (diff) | |
soc/intel/commom/block/i2c: Make I2C controller out of reset
This patch ensures I2C controllers are out of reset without any
assumptions.
BUG=b:116191230
BRANCH=none
TEST=Dump MMIO offset 0x204 to check if I2C host controller is NOT
at reset (by reading Bit 0-1 as 3)
Change-Id: I4b335a834333e01cfa2d802e4aad0735d0212dcc
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/28762
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
| -rw-r--r-- | src/soc/intel/common/block/i2c/i2c.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/src/soc/intel/common/block/i2c/i2c.c b/src/soc/intel/common/block/i2c/i2c.c index 11bd018c8b..c6c511575d 100644 --- a/src/soc/intel/common/block/i2c/i2c.c +++ b/src/soc/intel/common/block/i2c/i2c.c @@ -1,7 +1,7 @@ /* * This file is part of the coreboot project. * - * Copyright 2017 Intel Corporation. + * Copyright 2017-2018 Intel Corporation. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -146,6 +146,29 @@ uintptr_t dw_i2c_base_address(unsigned int bus) return (uintptr_t)NULL; } +/* + * This function ensures that the device is actually out of reset and + * its ready for initialization sequence. + */ +static void dw_i2c_device_init(struct device *dev) +{ + uintptr_t base_address; + int bus = dw_i2c_soc_dev_to_bus(dev); + + if (bus < 0) + return; + + base_address = dw_i2c_base_address(bus); + if (!base_address) + return; + + /* Take device out of reset if its not done before */ + if (lpss_is_controller_in_reset(base_address)) + lpss_reset_release(base_address); + + dw_i2c_dev_init(dev); +} + static struct device_operations i2c_dev_ops = { .read_resources = &pci_dev_read_resources, .set_resources = &pci_dev_set_resources, @@ -153,7 +176,7 @@ static struct device_operations i2c_dev_ops = { .scan_bus = &scan_smbus, .ops_i2c_bus = &dw_i2c_bus_ops, .ops_pci = &pci_dev_ops_pci, - .init = &dw_i2c_dev_init, + .init = &dw_i2c_device_init, .acpi_fill_ssdt_generator = &dw_i2c_acpi_fill_ssdt, }; |