On 11/25/23 18:37, Krzysztof Kozlowski and Chunfeng Yun wrote:
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On 25/11/2023 02:23, Chunfeng Yun wrote:
Due to some old SoCs with shared t-phy only support force-mode switch, and
can't use compatible to distinguish between shared and non-shared t-phy,
add a property to supported it.
But now prefer to use "mediatek,syscon-type" on new SoC as far as possible.
Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
---
Documentation/devicetree/bindings/phy/mediatek,tphy.yaml | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
index 2bb91542e984..eedba5b7025e 100644
--- a/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
+++ b/Documentation/devicetree/bindings/phy/mediatek,tphy.yaml
@@ -235,6 +235,12 @@ patternProperties:
Specify the flag to enable BC1.2 if support it
type: boolean
+ mediatek,force-mode:
+ description:
+ Use force mode to switch shared phy mode, perfer to use the bellow
I still do not understand what is the "force mode" you want to use. What
modes do you have? What are the characteristics of force mode?
Also, please run spellcheck.
Best regards,
Krzysztof
Thanks!
1. I've tested this patch and it could solve the clock unstable for
XHCI1 on mt8195 or mt8395 during system boot up or during
unload/reload the phy driver.
The error message has been listed as follows.
[ 13.849936][ T72] xhci-mtk 11290000.usb: supply vbus not found,
using dummy regulator
[ 13.851300][ T72] xhci-mtk 11290000.usb: uwk - reg:0x400, version:104
[ 13.852624][ T72] xhci-mtk 11290000.usb: xHCI Host Controller
[ 13.853393][ T72] xhci-mtk 11290000.usb: new USB bus registered,
assigned bus number 3
[ 13.874490][ T72] xhci-mtk 11290000.usb: clocks are not stable (0x3d0f)
[ 13.875369][ T72] xhci-mtk 11290000.usb: can't setup: -110
[ 13.876091][ T72] xhci-mtk 11290000.usb: USB bus 3 deregistered
[ 13.877081][ T72] xhci-mtk: probe of 11290000.usb failed with error
-110
2. This is a fix patch to XHCI1 since MT8195 has been upstream.
Please add "Fixes:" tags and "Cc: stable@xxxxxxxxxx" to back ward
porting to previous stable trees.
For example, add
Fixes: 6b5ef194611e5 ("phy: mediatek: tphy: remove macros to prepare
bitfield")
is suggested since the force-mode was missing in the previous
implementation which causes hardware function was abnormal.
However, add
Fixes: 33d18746fa514 ("phy: phy-mtk-tphy: use new io helpers to access
register")
will be better since the USB support for mt8195 is already enabled in
late 2021.
3. How about we revise the description as follows for more precisely?
mediatek,force-mode:
description:
The force mode is used to manually switch the shared PHY mode
between USB and PCIe. When force-mode is set, the USB 3.0 mode
will be selected. This is typically required for older SoCs
that do not automatically manage PHY mode switching.
For newer SoCs that support it, it is preferable to use the
"mediatek,syscon-type" property instead.
type: boolean
Thanks,
Macpaul Lin
