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From ea6fc42a58b92c5771a881a268d2dd5ce602d79e Mon Sep 17 00:00:00 2001
From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Date: Wed, 14 Jun 2023 09:12:47 +0200
Subject: [PATCH] colibri_imx6: fix RALAT and WALAT values
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Running a memtest in U-Boot and Linux shows that some Colibri iMX6
produce bitflips at temperatures above 60°C. This happens because the
RALAT and WALAT values on the Colibri iMX6 are too low. The problems
were introduced by commit 09dbac8174c4 ("mx6: ddr: Restore ralat/walat
in write level calibration") before the calibration process overwrote
the values and set them to the maximum value. With this commit, we make
sure that the RALAT and WALAT values are set to the maximum values
again. This has been proven to work for years.
Upstream-Status: Submitted [https://lore.kernel.org/all/20230614090137.17626-1-francesco@dolcini.it/]
Fixes: 09dbac8174c4 ("mx6: ddr: Restore ralat/walat in write level calibration")
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
---
board/toradex/colibri_imx6/colibri_imx6.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/board/toradex/colibri_imx6/colibri_imx6.c b/board/toradex/colibri_imx6/colibri_imx6.c
index ab2ab587ff..a1e7ec3838 100644
--- a/board/toradex/colibri_imx6/colibri_imx6.c
+++ b/board/toradex/colibri_imx6/colibri_imx6.c
@@ -767,8 +767,7 @@ MX6_MMDC_P1_MPRDDQBY3DL, 0x33333333,
/*
* MDMISC mirroring interleaved (row/bank/col)
*/
-/* TODO: check what the RALAT field does */
-MX6_MMDC_P0_MDMISC, 0x00081740,
+MX6_MMDC_P0_MDMISC, 0x000b17c0,
/*
* MDSCR con_req
@@ -900,8 +899,7 @@ MX6_MMDC_P1_MPRDDQBY3DL, 0x33333333,
/*
* MDMISC mirroring interleaved (row/bank/col)
*/
-/* TODO: check what the RALAT field does */
-MX6_MMDC_P0_MDMISC, 0x00081740,
+MX6_MMDC_P0_MDMISC, 0x000b17c0,
/*
* MDSCR con_req
--
2.39.2
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