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lantiq: kernel: xway-nand: Move ECC engine setting to new DT binding

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When trying to add support for another device with Micron NAND chips,
it was discovered that the default setting in the kernel source does
not work with Micron Chips, since the device trees setting is
overwritten and hard coded by the kernel xway_nand driver. This was
the original reason for this PR.
A kernel patch sets the default ECC mode to soft without overwriting
the device tree settings and the device tree for devices using it
are updated with new parameters because the old ones are deprecated
by torvalds/linux@533af69.
A patch for kernel 5.4 is provided to support the new settings
because kernel 5.4 does not support it.

Signed-off-by: Daniel Kestrel <kestrel1974@t-online.de>
This commit is contained in:
Daniel Kestrel 2021-08-07 09:28:24 +02:00 committed by Hauke Mehrtens
parent 6bb51c9d1c
commit ca1874437c
13 changed files with 50 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/ar9_bt_homehub-v3a.dts
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@ -130,6 +130,8 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/danube_bt_homehub-v2b.dts
View File

@ -183,6 +183,8 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz3370-rev2-hynix.dts
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@ -14,7 +14,7 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-ecc-mode = "soft";
nand-use-soft-ecc-engine;
nand-ecc-strength = <3>;
nand-ecc-step-size = <256>;

4
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz3370-rev2-micron.dts
View File

@ -6,7 +6,7 @@
};
&localbus {
flash@1 {
flash1: flash@1 {
compatible = "lantiq,nand-xway";
bank-width = <2>;
reg = <1 0x0 0x2000000>;
@ -14,7 +14,7 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-ecc-mode = "on-die";
nand-ecc-engine = <&flash1>;
partitions {
compatible = "fixed-partitions";

4
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz3390.dts
View File

@ -231,7 +231,7 @@
};
&localbus {
flash@1 {
flash1: flash@1 {
compatible = "lantiq,nand-xway";
bank-width = <1>;
reg = <1 0x0 0x2000000>;
@ -239,7 +239,7 @@
pinctrl-0 = <&nand_pins>;
pinctrl-names = "default";
nand-ecc-mode = "on-die";
nand-ecc-engine = <&flash1>;
partitions {
compatible = "fixed-partitions";

4
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz7362sl.dts
View File

@ -46,7 +46,7 @@
};
&localbus {
flash@1 {
flash1: flash@1 {
compatible = "lantiq,nand-xway";
lantiq,cs1 = <1>;
bank-width = <1>;
@ -55,7 +55,7 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-ecc-mode = "on-die";
nand-ecc-engine = <&flash1>;
partitions {
compatible = "fixed-partitions";

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz7412.dts
View File

@ -91,6 +91,8 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_avm_fritz7430.dts
View File

@ -103,6 +103,8 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

1
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_bt_homehub-v5a.dts
View File

@ -216,6 +216,7 @@
nand-on-flash-bbt;
nand-ecc-strength = <3>;
nand-ecc-step-size = <256>;
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_lantiq_easy80920-nand.dts
View File

@ -19,6 +19,8 @@
pinctrl-0 = <&nand_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_zyxel_p-2812hnu-f1.dts
View File

@ -30,6 +30,8 @@
pinctrl-0 = <&nand_pins>, <&nand_cs1_pins>;
pinctrl-names = "default";
nand-use-soft-ecc-engine;
partitions {
compatible = "fixed-partitions";
#address-cells = <1>;

2
target/linux/lantiq/files/arch/mips/boot/dts/lantiq/vr9_zyxel_p-2812hnu-f3.dts
View File

@ -51,6 +51,8 @@
#address-cells = <1>;
#size-cells = <1>;
nand-use-soft-ecc-engine;
partition@0 {
label = "kernel";
reg = <0x0 0x200000>;

28
target/linux/lantiq/patches-5.4/0019-MTD-nand-support-new-dt-bindings.patch Normal file
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@ -0,0 +1,28 @@
The nand-ecc-mode DT binding is depracated but the new bindings are
not supported by kernel 5.4. Based on a fix in the kernel to not
overwrite the DT ECC settings, the DT needs to be updated and moves
to the new DT binding.
Since the DT is shared between kernel 5.4 and 5.10, this patch is
an interim solution to allow to use the new DT bindings in kernel 5.4.
It should be removed when moving away from kernel 5.4.
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -4851,10 +4851,17 @@ static int of_get_nand_ecc_mode(struct d
{
const char *pm;
int err, i;
+ struct device_node *eng_np;
err = of_property_read_string(np, "nand-ecc-mode", &pm);
- if (err < 0)
+ if (err < 0) {
+ if (of_property_read_bool(np, "nand-use-soft-ecc-engine"))
+ return NAND_ECC_SOFT;
+ eng_np = of_parse_phandle(np, "nand-ecc-engine", 0);
+ if (eng_np && (eng_np == np))
+ return NAND_ECC_ON_DIE;
return err;
+ }
for (i = 0; i < ARRAY_SIZE(nand_ecc_modes); i++)
if (!strcasecmp(pm, nand_ecc_modes[i]))