* [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz
@ 2021-07-13 19:54 Oleksandr Suvorov
2021-07-13 20:09 ` Fabio Estevam
0 siblings, 1 reply; 3+ messages in thread
From: Oleksandr Suvorov @ 2021-07-13 19:54 UTC (permalink / raw)
To: linux-next
Cc: Oleksandr Suvorov, Fabio Estevam, NXP Linux Team,
Pengutronix Kernel Team, Rob Herring, Sascha Hauer, Shawn Guo,
devicetree, linux-arm-kernel, linux-kernel
NXP and AzureWave don't recommend using SDIO bus mode 3.3V@50MHz due
to noise affecting the wireless throughput. Colibri iMX6ULL uses only
3.3V signaling for Wi-Fi module AW-CM276NF.
Limit the SDIO Clock on Colibri iMX6ULL to 25MHz.
Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov@toradex.com>
---
arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi b/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi
index a0545431b3dc..9f1e38282bee 100644
--- a/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi
+++ b/arch/arm/boot/dts/imx6ull-colibri-wifi.dtsi
@@ -43,6 +43,7 @@ &usdhc2 {
assigned-clock-rates = <0>, <198000000>;
cap-power-off-card;
keep-power-in-suspend;
+ max-frequency = <25000000>;
mmc-pwrseq = <&wifi_pwrseq>;
no-1-8-v;
non-removable;
--
2.31.1
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^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz
2021-07-13 19:54 [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz Oleksandr Suvorov
@ 2021-07-13 20:09 ` Fabio Estevam
2021-07-13 20:23 ` Oleksandr Suvorov
0 siblings, 1 reply; 3+ messages in thread
From: Fabio Estevam @ 2021-07-13 20:09 UTC (permalink / raw)
To: Oleksandr Suvorov
Cc: Linux Next Mailing List, NXP Linux Team, Pengutronix Kernel Team,
Rob Herring, Sascha Hauer, Shawn Guo,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE,
linux-kernel
Hi Oleksandr,
On Tue, Jul 13, 2021 at 4:54 PM Oleksandr Suvorov
<oleksandr.suvorov@toradex.com> wrote:
>
> NXP and AzureWave don't recommend using SDIO bus mode 3.3V@50MHz due
> to noise affecting the wireless throughput. Colibri iMX6ULL uses only
> 3.3V signaling for Wi-Fi module AW-CM276NF.
>
> Limit the SDIO Clock on Colibri iMX6ULL to 25MHz.
What about adding a Fixes tag so that it can go to the stable trees?
Reviewed-by: Fabio Estevam <festevam@gmail.com>
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http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz
2021-07-13 20:09 ` Fabio Estevam
@ 2021-07-13 20:23 ` Oleksandr Suvorov
0 siblings, 0 replies; 3+ messages in thread
From: Oleksandr Suvorov @ 2021-07-13 20:23 UTC (permalink / raw)
To: Fabio Estevam
Cc: Linux Next Mailing List, NXP Linux Team, Pengutronix Kernel Team,
Rob Herring, Sascha Hauer, Shawn Guo,
open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS,
moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE,
linux-kernel
Hi Fabio,
On Tue, Jul 13, 2021 at 11:10 PM Fabio Estevam <festevam@gmail.com> wrote:
>
> Hi Oleksandr,
>
> On Tue, Jul 13, 2021 at 4:54 PM Oleksandr Suvorov
> <oleksandr.suvorov@toradex.com> wrote:
> >
> > NXP and AzureWave don't recommend using SDIO bus mode 3.3V@50MHz due
> > to noise affecting the wireless throughput. Colibri iMX6ULL uses only
> > 3.3V signaling for Wi-Fi module AW-CM276NF.
> >
> > Limit the SDIO Clock on Colibri iMX6ULL to 25MHz.
>
> What about adding a Fixes tag so that it can go to the stable trees?
Good point, thanks! I'll add in the 2nd version.
>
> Reviewed-by: Fabio Estevam <festevam@gmail.com>
Thanks for the review!
Best regards
Oleksandr Suvorov
Toradex AG
Ebenaustrasse 10 | 6048 Horw | Switzerland | T: +41 41 500 48 00
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2021-07-13 19:54 [PATCH] ARM: dts: colibri-imx6ull: limit SDIO clock to 25MHz Oleksandr Suvorov
2021-07-13 20:09 ` Fabio Estevam
2021-07-13 20:23 ` Oleksandr Suvorov
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