i.MX7ULP does NOT support runtime switching clock source for PCC,
APLL_PFD1 by default is usdhc's clock source, so just use it
in kernel to avoid below kernel dump during kernel boot up and
make sure kernel can boot up with SD root file-system.
[ 3.035892] Loading compiled-in X.509 certificates
[ 3.136301] sdhci-esdhc-imx 40370000.mmc: Got CD GPIO
[ 3.242886] mmc0: Reset 0x1 never completed.
[ 3.247190] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
[ 3.253751] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000002
[ 3.260218] mmc0: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000001
[ 3.266775] mmc0: sdhci: Argument: 0x00009a64 | Trn mode: 0x00000000
[ 3.273333] mmc0: sdhci: Present: 0x00088088 | Host ctl: 0x00000002
[ 3.279794] mmc0: sdhci: Power: 0x00000000 | Blk gap: 0x00000080
[ 3.286350] mmc0: sdhci: Wake-up: 0x00000008 | Clock: 0x0000007f
[ 3.292901] mmc0: sdhci: Timeout: 0x0000008c | Int stat: 0x00000000
[ 3.299364] mmc0: sdhci: Int enab: 0x007f010b | Sig enab: 0x00000000
[ 3.305918] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00008402
[ 3.312471] mmc0: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000b400
[ 3.318934] mmc0: sdhci: Cmd: 0x0000113a | Max curr: 0x00ffffff
[ 3.325488] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x0039b37f
[ 3.332040] mmc0: sdhci: Resp[2]: 0x325b5900 | Resp[3]: 0x00400e00
[ 3.338501] mmc0: sdhci: Host ctl2: 0x00000000
[ 3.343051] mmc0: sdhci: ============================================
Signed-off-by: Anson Huang <[email protected]>
---
arch/arm/boot/dts/imx7ulp-evk.dts | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/boot/dts/imx7ulp-evk.dts b/arch/arm/boot/dts/imx7ulp-evk.dts
index f1093d2..a863a2b 100644
--- a/arch/arm/boot/dts/imx7ulp-evk.dts
+++ b/arch/arm/boot/dts/imx7ulp-evk.dts
@@ -78,7 +78,7 @@
&usdhc0 {
assigned-clocks = <&pcc2 IMX7ULP_CLK_USDHC0>;
- assigned-clock-parents = <&scg1 IMX7ULP_CLK_NIC1_DIV>;
+ assigned-clock-parents = <&scg1 IMX7ULP_CLK_APLL_PFD1>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_usdhc0>;
cd-gpios = <&gpio_ptc 10 GPIO_ACTIVE_LOW>;
--
2.7.4
Hi Anson,
On Tue, Oct 29, 2019 at 7:06 AM Anson Huang <[email protected]> wrote:
>
> i.MX7ULP does NOT support runtime switching clock source for PCC,
> APLL_PFD1 by default is usdhc's clock source, so just use it
> in kernel to avoid below kernel dump during kernel boot up and
> make sure kernel can boot up with SD root file-system.
>
> [ 3.035892] Loading compiled-in X.509 certificates
> [ 3.136301] sdhci-esdhc-imx 40370000.mmc: Got CD GPIO
> [ 3.242886] mmc0: Reset 0x1 never completed.
> [ 3.247190] mmc0: sdhci: ============ SDHCI REGISTER DUMP ===========
> [ 3.253751] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000002
> [ 3.260218] mmc0: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000001
> [ 3.266775] mmc0: sdhci: Argument: 0x00009a64 | Trn mode: 0x00000000
> [ 3.273333] mmc0: sdhci: Present: 0x00088088 | Host ctl: 0x00000002
> [ 3.279794] mmc0: sdhci: Power: 0x00000000 | Blk gap: 0x00000080
> [ 3.286350] mmc0: sdhci: Wake-up: 0x00000008 | Clock: 0x0000007f
> [ 3.292901] mmc0: sdhci: Timeout: 0x0000008c | Int stat: 0x00000000
> [ 3.299364] mmc0: sdhci: Int enab: 0x007f010b | Sig enab: 0x00000000
> [ 3.305918] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00008402
> [ 3.312471] mmc0: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000b400
> [ 3.318934] mmc0: sdhci: Cmd: 0x0000113a | Max curr: 0x00ffffff
> [ 3.325488] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x0039b37f
> [ 3.332040] mmc0: sdhci: Resp[2]: 0x325b5900 | Resp[3]: 0x00400e00
> [ 3.338501] mmc0: sdhci: Host ctl2: 0x00000000
> [ 3.343051] mmc0: sdhci: ============================================
>
> Signed-off-by: Anson Huang <[email protected]>
Thanks, with this patch applied I can get SD card rootfs to get mounted:
Tested-by: Fabio Estevam <[email protected]>
I think this fix deserves a Fixes tag so that it can be backported to
older kernels.
Hi, Fabio
> On Tue, Oct 29, 2019 at 7:06 AM Anson Huang <[email protected]>
> wrote:
> >
> > i.MX7ULP does NOT support runtime switching clock source for PCC,
> > APLL_PFD1 by default is usdhc's clock source, so just use it in kernel
> > to avoid below kernel dump during kernel boot up and make sure kernel
> > can boot up with SD root file-system.
> >
> > [ 3.035892] Loading compiled-in X.509 certificates
> > [ 3.136301] sdhci-esdhc-imx 40370000.mmc: Got CD GPIO
> > [ 3.242886] mmc0: Reset 0x1 never completed.
> > [ 3.247190] mmc0: sdhci: ============ SDHCI REGISTER DUMP
> ===========
> > [ 3.253751] mmc0: sdhci: Sys addr: 0x00000000 | Version: 0x00000002
> > [ 3.260218] mmc0: sdhci: Blk size: 0x00000200 | Blk cnt: 0x00000001
> > [ 3.266775] mmc0: sdhci: Argument: 0x00009a64 | Trn mode:
> 0x00000000
> > [ 3.273333] mmc0: sdhci: Present: 0x00088088 | Host ctl: 0x00000002
> > [ 3.279794] mmc0: sdhci: Power: 0x00000000 | Blk gap: 0x00000080
> > [ 3.286350] mmc0: sdhci: Wake-up: 0x00000008 | Clock: 0x0000007f
> > [ 3.292901] mmc0: sdhci: Timeout: 0x0000008c | Int stat: 0x00000000
> > [ 3.299364] mmc0: sdhci: Int enab: 0x007f010b | Sig enab: 0x00000000
> > [ 3.305918] mmc0: sdhci: ACmd stat: 0x00000000 | Slot int: 0x00008402
> > [ 3.312471] mmc0: sdhci: Caps: 0x07eb0000 | Caps_1: 0x0000b400
> > [ 3.318934] mmc0: sdhci: Cmd: 0x0000113a | Max curr: 0x00ffffff
> > [ 3.325488] mmc0: sdhci: Resp[0]: 0x00000900 | Resp[1]: 0x0039b37f
> > [ 3.332040] mmc0: sdhci: Resp[2]: 0x325b5900 | Resp[3]: 0x00400e00
> > [ 3.338501] mmc0: sdhci: Host ctl2: 0x00000000
> > [ 3.343051] mmc0: sdhci:
> ============================================
> >
> > Signed-off-by: Anson Huang <[email protected]>
>
> Thanks, with this patch applied I can get SD card rootfs to get mounted:
>
> Tested-by: Fabio Estevam <[email protected]>
>
> I think this fix deserves a Fixes tag so that it can be backported to older
> kernels.
Will add fix tag in V2, thanks.
Anson