[PATCH 14/14] arm64: dts: freescale: imx93-tqma9352: set SION for cmd and data pad of USDHC

Alexander Stein
2024-07-24T13:05:14Z

From: Markus Niebel <Markus.Niebel@ew.tq-group.com>

imx93 pad integrate has one issue, refer to ERR052021:

ERR052021 uSDHC: Sometimes uSDHC does not work under VDD_SOC low
drive mode and nominal mode
Description:
uSDHC PADs have one integration issue.
When CMD/DATA lines direction change from output to input, uSDHC
controller begin sampling, the integration issue will make input
enable signal from uSDHC propagated to the PAD with a long delay,
thus the new input value on the pad comes to uSDHC lately. The
uSDHC sampled the old input value and the sampling result is wrong.

Workaround:
Set uSDHC CMD/DATA PADs iomux register SION bit to 1, then PADs will
propagate input to uSDHC with no delay, so correct value is sampled.

This issue will wrongly trigger the start bit when sample the USDHC
command response, cause the USDHC trigger command CRC/index/endbit
error, which will finally impact the tuning pass window, espically
will impact the standard tuning logic, and can't find a correct delay
cell to get the best timing.

This follows changes made for i.MX93 EVK with commit
bb89601282fc ("arm64: dts: imx93-11x11-evk: set SION for cmd and data pad of USDHC")

Signed-off-by: Markus Niebel <Markus.Niebel@ew.tq-group.com>
Signed-off-by: Alexander Stein <alexander.stein@ew.tq-group.com>
---
.../freescale/imx93-tqma9352-mba93xxca.dts | 22 ++++++++++---------
.../freescale/imx93-tqma9352-mba93xxla.dts | 22 ++++++++++---------
.../boot/dts/freescale/imx93-tqma9352.dtsi | 19 ++++++++--------
3 files changed, 34 insertions(+), 29 deletions(-)

diff --git a/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxca.dts b/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxca.dts
index 9a21fbf986fe..d7c067450503 100644
--- a/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxca.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxca.dts
@@ -870,32 +870,34 @@ MX93_PAD_SD2_CD_B__GPIO3_IO00 0x1000
>;
};

+ /* enable SION for data and cmd pad due to ERR052021 */
pinctrl_usdhc2_hs: usdhc2hsgrp {
fsl,pins = <
/* PD | FSEL_3 | DSE X5 */
MX93_PAD_SD2_CLK__USDHC2_CLK 0x05be
/* HYS | PU | FSEL_3 | DSE X4 */
- MX93_PAD_SD2_CMD__USDHC2_CMD 0x139e
+ MX93_PAD_SD2_CMD__USDHC2_CMD 0x4000139e
/* HYS | PU | FSEL_3 | DSE X3 */
- MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x138e
- MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x138e
- MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x138e
- MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x138e
+ MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x4000138e
+ MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x4000138e
+ MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x4000138e
+ MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x4000138e
/* FSEL_2 | DSE X3 */
MX93_PAD_SD2_VSELECT__USDHC2_VSELECT 0x010e
>;
};

+ /* enable SION for data and cmd pad due to ERR052021 */
pinctrl_usdhc2_uhs: usdhc2uhsgrp {
fsl,pins = <
/* PD | FSEL_3 | DSE X6 */
MX93_PAD_SD2_CLK__USDHC2_CLK 0x05fe
/* HYS | PU | FSEL_3 | DSE X4 */
- MX93_PAD_SD2_CMD__USDHC2_CMD 0x139e
- MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x139e
- MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x139e
- MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x139e
- MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x139e
+ MX93_PAD_SD2_CMD__USDHC2_CMD 0x4000139e
+ MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x4000139e
+ MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x4000139e
+ MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x4000139e
+ MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x4000139e
/* FSEL_2 | DSE X3 */
MX93_PAD_SD2_VSELECT__USDHC2_VSELECT 0x010e
>;
diff --git a/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxla.dts b/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxla.dts
index b9a22d6c1de2..0409dffe844c 100644
--- a/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxla.dts
+++ b/arch/arm64/boot/dts/freescale/imx93-tqma9352-mba93xxla.dts
@@ -820,32 +820,34 @@ MX93_PAD_SD2_CD_B__GPIO3_IO00 0x1000
>;
};

+ /* enable SION for data and cmd pad due to ERR052021 */
pinctrl_usdhc2_hs: usdhc2hsgrp {
fsl,pins = <
/* PD | FSEL_3 | DSE X5 */
MX93_PAD_SD2_CLK__USDHC2_CLK 0x05be
/* HYS | PU | FSEL_3 | DSE X4 */
- MX93_PAD_SD2_CMD__USDHC2_CMD 0x139e
+ MX93_PAD_SD2_CMD__USDHC2_CMD 0x4000139e
/* HYS | PU | FSEL_3 | DSE X3 */
- MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x138e
- MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x138e
- MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x138e
- MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x138e
+ MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x4000138e
+ MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x4000138e
+ MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x4000138e
+ MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x4000138e
/* FSEL_2 | DSE X3 */
MX93_PAD_SD2_VSELECT__USDHC2_VSELECT 0x010e
>;
};

+ /* enable SION for data and cmd pad due to ERR052021 */
pinctrl_usdhc2_uhs: usdhc2uhsgrp {
fsl,pins = <
/* PD | FSEL_3 | DSE X6 */
MX93_PAD_SD2_CLK__USDHC2_CLK 0x05fe
/* HYS | PU | FSEL_3 | DSE X4 */
- MX93_PAD_SD2_CMD__USDHC2_CMD 0x139e
- MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x139e
- MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x139e
- MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x139e
- MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x139e
+ MX93_PAD_SD2_CMD__USDHC2_CMD 0x4000139e
+ MX93_PAD_SD2_DATA0__USDHC2_DATA0 0x4000139e
+ MX93_PAD_SD2_DATA1__USDHC2_DATA1 0x4000139e
+ MX93_PAD_SD2_DATA2__USDHC2_DATA2 0x4000139e
+ MX93_PAD_SD2_DATA3__USDHC2_DATA3 0x4000139e
/* FSEL_2 | DSE X3 */
MX93_PAD_SD2_VSELECT__USDHC2_VSELECT 0x010e
>;
diff --git a/arch/arm64/boot/dts/freescale/imx93-tqma9352.dtsi b/arch/arm64/boot/dts/freescale/imx93-tqma9352.dtsi
index 63b02552c55d..ac9f94baf4cd 100644
--- a/arch/arm64/boot/dts/freescale/imx93-tqma9352.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx93-tqma9352.dtsi
@@ -269,6 +269,7 @@ MX93_PAD_SD2_RESET_B__GPIO3_IO07 0x106
>;
};

+ /* enable SION for data and cmd pad due to ERR052021 */
pinctrl_usdhc1: usdhc1grp {
fsl,pins = <
/* PD | FSEL 3 | DSE X5 */
@@ -276,16 +277,16 @@ MX93_PAD_SD1_CLK__USDHC1_CLK 0x5be
/* HYS | FSEL 0 | no drive */
MX93_PAD_SD1_STROBE__USDHC1_STROBE 0x1000
/* HYS | FSEL 3 | X5 */
- MX93_PAD_SD1_CMD__USDHC1_CMD 0x11be
+ MX93_PAD_SD1_CMD__USDHC1_CMD 0x400011be
/* HYS | FSEL 3 | X4 */
- MX93_PAD_SD1_DATA0__USDHC1_DATA0 0x119e
- MX93_PAD_SD1_DATA1__USDHC1_DATA1 0x119e
- MX93_PAD_SD1_DATA2__USDHC1_DATA2 0x119e
- MX93_PAD_SD1_DATA3__USDHC1_DATA3 0x119e
- MX93_PAD_SD1_DATA4__USDHC1_DATA4 0x119e
- MX93_PAD_SD1_DATA5__USDHC1_DATA5 0x119e
- MX93_PAD_SD1_DATA6__USDHC1_DATA6 0x119e
- MX93_PAD_SD1_DATA7__USDHC1_DATA7 0x119e
+ MX93_PAD_SD1_DATA0__USDHC1_DATA0 0x4000119e
+ MX93_PAD_SD1_DATA1__USDHC1_DATA1 0x4000119e
+ MX93_PAD_SD1_DATA2__USDHC1_DATA2 0x4000119e
+ MX93_PAD_SD1_DATA3__USDHC1_DATA3 0x4000119e
+ MX93_PAD_SD1_DATA4__USDHC1_DATA4 0x4000119e
+ MX93_PAD_SD1_DATA5__USDHC1_DATA5 0x4000119e
+ MX93_PAD_SD1_DATA6__USDHC1_DATA6 0x4000119e
+ MX93_PAD_SD1_DATA7__USDHC1_DATA7 0x4000119e
>;
};

--
2.34.1