| Message ID | 20231120-j7200-usb-suspend-v2-0-038c7e4a3df4@bootlin.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | usb: cdns: fix suspend on J7200 by assuming reset-on-resume | expand |
On 20/11/2023 18:06, Théo Lebrun wrote: > Hi, > > Suspend on the TI J7200 platform is broken currently. There are two > components that need to be patched so that they assume reset on > resume: (1) the TI wrapper cdns3-ti & (2) the HOST role of the > controller. > > About (1): the TI wrapper only did its hardware configuration at probe > time. Update so that it is done at resume on J7200 SoC. > > About (2): signal from cdns3-ti to cdns3 host to xHCI that the > controller resets on resume. This way we avoid the following warning: > > xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit > > Strictly speaking (2) is not required to have working suspend on J7200; > its only goal is to silence this warning. > > Those patches have been tested on the TI J7200 EVM GP. No need to Yeah, but you forgot about dtbs_check testing. It's a step before testing on the device. It does not make sense to test a code if it causes build-time warnings. Best regards, Krzysztof
Théo Lebrun <theo.lebrun@bootlin.com> writes: > Hi, > > Suspend on the TI J7200 platform is broken currently. There are two > components that need to be patched so that they assume reset on > resume: (1) the TI wrapper cdns3-ti & (2) the HOST role of the > controller. > > About (1): the TI wrapper only did its hardware configuration at probe > time. Update so that it is done at resume on J7200 SoC. > > About (2): signal from cdns3-ti to cdns3 host to xHCI that the > controller resets on resume. This way we avoid the following warning: > > xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit > > Strictly speaking (2) is not required to have working suspend on J7200; > its only goal is to silence this warning. > > Those patches have been tested on the TI J7200 EVM GP. No need to > mention that other patches are required for S2R to work, but those will > be sent later down the road. Those USB patches are rather standalone. > > Thanks, > Théo > > -- > Théo Lebrun, Bootlin > Embedded Linux and Kernel engineering > https://bootlin.com > > Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> > --- > Changes in v2: > - Remove runtime PM from cdns3-ti; it brings nothing. That means our > cdns3-ti suspend/resume patch is simpler; there is no need to handle > runtime PM at suspend/resume. Sorry I sent comments on v2 before I noticed v3 was out, but this is not a good idea IMO. I sent more detailed comment on that specific patch. Kevin
Hi, Suspend on the TI J7200 platform is broken currently. There are two components that need to be patched so that they assume reset on resume: (1) the TI wrapper cdns3-ti & (2) the HOST role of the controller. About (1): the TI wrapper only did its hardware configuration at probe time. Update so that it is done at resume on J7200 SoC. About (2): signal from cdns3-ti to cdns3 host to xHCI that the controller resets on resume. This way we avoid the following warning: xhci-hcd xhci-hcd.1.auto: xHC error in resume, USBSTS 0x401, Reinit Strictly speaking (2) is not required to have working suspend on J7200; its only goal is to silence this warning. Those patches have been tested on the TI J7200 EVM GP. No need to mention that other patches are required for S2R to work, but those will be sent later down the road. Those USB patches are rather standalone. Thanks, Théo -- Théo Lebrun, Bootlin Embedded Linux and Kernel engineering https://bootlin.com Signed-off-by: Théo Lebrun <theo.lebrun@bootlin.com> --- Changes in v2: - Remove runtime PM from cdns3-ti; it brings nothing. That means our cdns3-ti suspend/resume patch is simpler; there is no need to handle runtime PM at suspend/resume. - Do not add cdns3 host role suspend/resume callbacks; they are not needed as core detects reset on resume & calls cdns_drd_host_on when needed. - cdns3-ti: Move usb2_refclk_rate_code assignment closer to the value computation. - cdns3/host.c: do not pass XHCI_SUSPEND_RESUME_CLKS quirk to xHCI; it is unneeded on our platform. - Link to v1: https://lore.kernel.org/r/20231113-j7200-usb-suspend-v1-0-ad1ee714835c@bootlin.com --- Théo Lebrun (7): dt-bindings: usb: ti,j721e-usb: add ti,j7200-usb compatible usb: cdns3-ti: remove runtime PM usb: cdns3-ti: move reg writes from probe into an init_hw helper usb: cdns3-ti: add suspend/resume procedures for J7200 usb: cdns3: add quirk to platform data for reset-on-resume usb: cdns3-ti: signal reset-on-resume to xHCI for J7200 platform arm64: dts: ti: k3-j7200: use J7200-specific USB compatible .../devicetree/bindings/usb/ti,j721e-usb.yaml | 4 + arch/arm64/boot/dts/ti/k3-j7200-main.dtsi | 2 +- drivers/usb/cdns3/cdns3-ti.c | 134 +++++++++++++-------- drivers/usb/cdns3/core.h | 1 + drivers/usb/cdns3/host.c | 3 + 5 files changed, 90 insertions(+), 54 deletions(-) --- base-commit: 1d42d5c8f1ca11106579dcaadef4161fee03419e change-id: 20231113-j7200-usb-suspend-2a47f2281e04 Best regards,