[PATCH v1] colibri_imx6: fix RALAT and WALAT values

[PATCH v1] colibri_imx6: fix RALAT and WALAT values

[Francesco Dolcini]

From: Stefan Eichenberger <stefan.eichenberger@toradex.com>

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.

Fixes: 09dbac8174c4 ("mx6: ddr: Restore ralat/walat in write level calibration")
Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
Signed-off-by: Francesco Dolcini <francesco.dolcini@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 65e0e9a156ab..677caa4a4ebc 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
-- 
2.25.1

[PATCH v1] colibri_imx6: fix RALAT and WALAT values

[sbabic]

> From: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> 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.
> Fixes: 09dbac8174c4 ("mx6: ddr: Restore ralat/walat in write level calibration")
> Signed-off-by: Stefan Eichenberger <stefan.eichenberger@toradex.com>
> Signed-off-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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