fix(stm32mp1): set reset pulse duration to 31ms
According to ST Application note AN5256 [1], the minimum reset pulse
duration should be set to 31ms on boards powered with discrete
regulators.
[1] https://www.st.com/resource/en/application_note/dm00561921.pdf
Change-Id: Ib6ed029ee8a4b95f75a80948fdd2154b4ebe484f
Signed-off-by: Yann Gautier <yann.gautier@foss.st.com>
diff --git a/plat/st/stm32mp1/bl2_plat_setup.c b/plat/st/stm32mp1/bl2_plat_setup.c
index 512afa8..3a79cfd 100644
--- a/plat/st/stm32mp1/bl2_plat_setup.c
+++ b/plat/st/stm32mp1/bl2_plat_setup.c
@@ -227,6 +227,16 @@
/* Disable MCKPROT */
mmio_clrbits_32(rcc_base + RCC_TZCR, RCC_TZCR_MCKPROT);
+ /*
+ * Set minimum reset pulse duration to 31ms for discrete power
+ * supplied boards.
+ */
+ if (dt_pmic_status() <= 0) {
+ mmio_clrsetbits_32(rcc_base + RCC_RDLSICR,
+ RCC_RDLSICR_MRD_MASK,
+ 31U << RCC_RDLSICR_MRD_SHIFT);
+ }
+
generic_delay_timer_init();
#if STM32MP_UART_PROGRAMMER