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ram: stm32mp1: tuning: add timeout for polling BISTGSR.BDDONE

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Avoid to block the tuning procedure on BIST error (not finished
BIST procedure) by adding a 1000us timeout on the polling of
BISTGSR.BDDONE executed to detect the end of BIST.

The normal duration of the BIST test is around 5us.

This patch also cleanup comments.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Patrice Chotard <patrice.chotard@st.com>
This commit is contained in:
Patrick Delaunay 2020-03-06 11:14:06 +01:00
parent 1c55a91b9d
commit f711d1f080
1 changed files with 24 additions and 19 deletions
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43
drivers/ram/stm32mp1/stm32mp1_tuning.c
View File

@ -8,6 +8,7 @@
#include <ram.h>
#include <reset.h>
#include <asm/io.h>
#include <linux/iopoll.h>
#include "stm32mp1_ddr_regs.h"
#include "stm32mp1_ddr.h"
@ -246,6 +247,8 @@ static void BIST_test(struct stm32mp1_ddrphy *phy, u8 byte,
bool result = true; /* BIST_SUCCESS */
u32 cnt = 0;
u32 error = 0;
u32 val;
int ret;
bist->test_result = true;
@ -274,27 +277,29 @@ run:
0x00000001);
/* Write BISTRR.BINST = 3?b001; */
/* Wait for a number of CTL clocks before reading BIST register*/
/* Wait 300 ctl_clk cycles; ... IS it really needed?? */
/* Perform BIST Instruction Stop*/
/* Write BISTRR.BINST = 3?b010;*/
/* poll on BISTGSR.BDONE and wait max 1000 us */
ret = readl_poll_timeout(&phy->bistgsr, val,
val & DDRPHYC_BISTGSR_BDDONE, 1000);
/* poll on BISTGSR.BDONE. If 0, wait. ++TODO Add timeout */
while (!(readl(&phy->bistgsr) & DDRPHYC_BISTGSR_BDDONE))
;
/*Check if received correct number of words*/
/* if (Read BISTWCSR.DXWCNT = Read BISTWCR.BWCNT) */
if (((readl(&phy->bistwcsr)) >> DDRPHYC_BISTWCSR_DXWCNT_SHIFT) ==
readl(&phy->bistwcr)) {
/*Determine if there is a data comparison error*/
/* if (Read BISTGSR.BDXERR = 1?b0) */
if (readl(&phy->bistgsr) & DDRPHYC_BISTGSR_BDXERR)
result = false; /* BIST_FAIL; */
else
result = true; /* BIST_SUCCESS; */
} else {
if (ret < 0) {
printf("warning: BIST timeout\n");
result = false; /* BIST_FAIL; */
/*Perform BIST Stop */
clrsetbits_le32(&phy->bistrr, 0x00000007, 0x00000002);
} else {
/*Check if received correct number of words*/
/* if (Read BISTWCSR.DXWCNT = Read BISTWCR.BWCNT) */
if (((readl(&phy->bistwcsr)) >> DDRPHYC_BISTWCSR_DXWCNT_SHIFT)
== readl(&phy->bistwcr)) {
/*Determine if there is a data comparison error*/
/* if (Read BISTGSR.BDXERR = 1?b0) */
if (readl(&phy->bistgsr) & DDRPHYC_BISTGSR_BDXERR)
result = false; /* BIST_FAIL; */
else
result = true; /* BIST_SUCCESS; */
} else {
result = false; /* BIST_FAIL; */
}
}
/* loop while success */