Hi Guennadi, On Thu, May 24, 2012 at 6:42 PM, Guennadi Liakhovetski <g.liakhovetski@xxxxxx> wrote: > Yes, exactly, in certain cases. And when it's not hard-wired? We don't support this yet. Daniel suggested using either black or white listing (based on vendor/device id presumably) so we can support regular cards without breaking others, but I'm not sure if Daniel had any free cycles to look into it. > Because with pluggable cards one flag is not enough. I think, you need (1) > board capability to switch power, and (2) driver's allowance to power the > card down. ... > The problem of hot-pluggable cards. One card / driver combination will > support powering down at runtime, another one will not. Ah ok now I understand you, thanks for the explanation. Whether or not to involve the driver here probably depends on the actual hardware requirements. E.g., if the vendor/device id is enough information, then we might be able to implement this below the drivers without involving them. But in case only the driver could tell between variants of specific chips, then a generic white/black listing might not be enough. Feel free to propose a solution, but please back it up with real hardware and show that it satisfies the MMC_CAP_POWER_OFF_CARD issues we had in the past. Thanks, Ohad. -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
