Messages in this thread | | | Date | Thu, 29 Sep 2022 09:08:26 +0200 | Subject | Re: [PATCH 0/4] pinctrl: pinctrl-zynqmp: Add tri-state configuration support | From | Michal Simek <> |
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Hi Laurent,
On 9/28/22 18:42, Laurent Pinchart wrote: > > On Wed, Sep 28, 2022 at 06:58:10PM +0300, Laurent Pinchart wrote: >> Hi Sai, >> >> On Fri, Jun 17, 2022 at 04:16:55PM +0530, Sai Krishna Potthuri wrote: >>> This series update the Xilinx firmware, ZynqMP dt-binding and ZynqMP >>> pinctrl driver to handle 'output-enable' and 'bias-high-impedance' >>> configurations. As part of these configurations, ZynqMP pinctrl driver >>> takes care of pin tri-state setting. >>> Also fix the kernel doc warning in ZynqMP pinctrl driver. >> >> I'm afraid this causes a regression :-( With this series applied, boot >> breaks with the following message being printed to the serial console: >> >> Received exception >> MSR: 0x200, EAR: 0xFF180198, EDR: 0x0, ESR: 0x64 >> >> I've traced that to the probe of the UART, when it calls into the >> firmware to set pin MIO18 to high impedance. According to v1.7 of the >> ZynqMP registers reference (UG1087), there is no register at address >> 0xFF180198. >> >> I am using the VCU TRD 2021.1 for testing. Does this series require a >> firmware update ? If so backward compatibility needs to be preserved. >> It's very late in the v6.0-rc cycle for a fix, a revert may be best at >> this point, to give us time to fix the issue properly. > > I've now tested the VCU TRD 2022.1 (which AFAIK is the latest available > version), and the problem doesn't occue then. It thus seems this depends > on a firmware update, which is impractical at best for all old designs > :-(
That's correct observation. Supporting these two properties requires newer pmufw or that message is received. I will let Arun and Jyotheeswar to comment it. I don't think there is a way to detect which firmware has implementation for it available.
Thanks, Michal
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