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feat(stm32mp1): add timeout in IO compensation

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Use a timeout during IO compensation enable function, when
waiting for ready status. If timeout expires, print a warning
message, to indicate that the SoC recommendation is not followed.

Change-Id: I98c7dcb1364b832f4f4b5fc9a0b85a3741a8af4b
Signed-off-by: Nicolas Le Bayon <nicolas.le.bayon@st.com>
Signed-off-by: Yann Gautier <yann.gautier@st.com>
This commit is contained in:
Nicolas Le Bayon 2019-11-18 17:18:06 +01:00 • committed by Yann Gautier
parent e1c018e807
commit de02e9b0ec
1 changed files with 17 additions and 4 deletions
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21
plat/st/stm32mp1/stm32mp1_syscfg.c
View file

@ -1,16 +1,16 @@
/*
* Copyright (c) 2019-2021, STMicroelectronics - All Rights Reserved
* Copyright (c) 2019-2022, STMicroelectronics - All Rights Reserved
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <platform_def.h>
#include <common/debug.h>
#include <drivers/delay_timer.h>
#include <drivers/st/bsec.h>
#include <drivers/st/stpmic1.h>
#include <lib/mmio.h>
#include <platform_def.h>
#include <stm32mp_dt.h>
#include <stm32mp1_private.h>
@ -54,6 +54,8 @@
#define SYSCFG_CMPCR_RAPSRC GENMASK(23, 20)
#define SYSCFG_CMPCR_ANSRC_SHIFT 24
#define SYSCFG_CMPCR_READY_TIMEOUT_US 10000U
/*
* SYSCFG_CMPENSETR Register
*/
@ -129,6 +131,8 @@ void stm32mp1_syscfg_init(void)
void stm32mp1_syscfg_enable_io_compensation(void)
{
uint64_t start;
/*
* Activate automatic I/O compensation.
* Warning: need to ensure CSI enabled and ready in clock driver.
@ -139,9 +143,18 @@ void stm32mp1_syscfg_enable_io_compensation(void)
mmio_setbits_32(SYSCFG_BASE + SYSCFG_CMPENSETR,
SYSCFG_CMPENSETR_MPU_EN);
start = timeout_init_us(SYSCFG_CMPCR_READY_TIMEOUT_US);
while ((mmio_read_32(SYSCFG_BASE + SYSCFG_CMPCR) &
SYSCFG_CMPCR_READY) == 0U) {
;
if (timeout_elapsed(start)) {
/*
* Failure on IO compensation enable is not a issue:
* warn only.
*/
WARN("IO compensation cell not ready\n");
break;
}
}
mmio_clrbits_32(SYSCFG_BASE + SYSCFG_CMPCR, SYSCFG_CMPCR_SW_CTRL);