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soc/intel/common/gpio: Use const variable to get gpio bitmask 

This patch introduces a `const bit_mask` variable to hold the gpio
PAD mask value prior to sending the lock configuration command using
the sideband interface.

Additionally, this patch fixes the PAD lock overridden issue as below:

Without this code change every consecutive PAD lock operation resets
other bits in that register as below:

After Locking pad 2 , pcr_read=0x4
After Locking pad 3 , pcr_read=0x8
After Locking pad 4 , pcr_read=0x10
After Locking pad 5 , pcr_read=0x20
After Locking pad 6 , pcr_read=0x40
After Locking pad 7 , pcr_read=0x80
After Locking pad 8 , pcr_read=0x100

With this code change all previous lock bits are getting preserved as
below:

After Locking pad 2 , pcr_read=0x4
After Locking pad 3 , pcr_read=0xc
After Locking pad 4 , pcr_read=0x1c
After Locking pad 5 , pcr_read=0x3c
After Locking pad 6 , pcr_read=0x7c
After Locking pad 7 , pcr_read=0xfc
After Locking pad 8 , pcr_read=0x1fc

BUG=b:211573253, b:211950520

Signed-off-by: Subrata Banik <subratabanik@google.com>
Change-Id: I342a666aa2d34bcc8ba33460396d1248f0c0f89f
Reviewed-on: https://review.coreboot.org/c/coreboot/+/60999
Reviewed-by: EricR Lai <ericr_lai@compal.corp-partner.google.com>
Reviewed-by: Nick Vaccaro <nvaccaro@google.com>
Reviewed-by: Maulik V Vaghela <maulik.v.vaghela@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
This commit is contained in:
Subrata Banik 2022-01-11 10:14:26 +00:00 committed by Felix Held
parent 38fcf40330
commit 6a4f5739c8
1 changed files with 3 additions and 1 deletions
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4
src/soc/intel/common/block/gpio/gpio.c
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@ -526,7 +526,7 @@ int gpio_lock_pads(const struct gpio_lock_config *pad_list, const size_t count)
/* PADCFGLOCK and PADCFGLOCKTX registers for each community are contiguous */
offset += gpio_group_index_scaled(comm, rel_pad, 2 * sizeof(uint32_t));
data = gpio_bitmask_within_group(comm, rel_pad);
const uint32_t bit_mask = gpio_bitmask_within_group(comm, rel_pad);
msg.pid = comm->port;
msg.offset = offset;
@ -534,6 +534,7 @@ int gpio_lock_pads(const struct gpio_lock_config *pad_list, const size_t count)
if (CONFIG(DEBUG_GPIO))
printk(BIOS_INFO, "%s: Locking pad %d configuration\n",
__func__, pad);
data = pcr_read32(msg.pid, msg.offset) | bit_mask;
status = pcr_execute_sideband_msg(PCH_DEV_P2SB, &msg, &data, &response);
if ((err = sideband_msg_err(status, response)) != 0) {
err_response = err;
@ -546,6 +547,7 @@ int gpio_lock_pads(const struct gpio_lock_config *pad_list, const size_t count)
printk(BIOS_INFO, "%s: Locking pad %d TX state\n",
__func__, pad);
msg.offset += sizeof(uint32_t);
data = pcr_read32(msg.pid, msg.offset) | bit_mask;
status = pcr_execute_sideband_msg(PCH_DEV_P2SB, &msg, &data, &response);
if ((err = sideband_msg_err(status, response)) != 0) {
err_response = err;