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Some commands uses R1B responses, which means the card may assert the DAT0 line to signal busy for a period of time, after it has received the command. The mmc core normally specifies the busy period for the command in the cmd->busy_timeout. Ideally the driver should respect it, but that requires quite some update of the code, so let's defer that to someone with the HW at hand. Instead, let's inform the mmc core about the maximum supported busy timeout in ->max_busy_timeout during ->probe(). This value corresponds to the fixed 5s timeout used by jz4740. In this way, we let the mmc core validate the needed timeout, which may lead to that it converts from a R1B into a R1 response and then use CMD13 to poll for busy completion. In other words, this change enables support for commands with longer busy periods than 5s, like erase (CMD38) for example. Cc: Paul Cercueil <paul@crapouillou.net> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Link: https://lore.kernel.org/r/20200414161413.3036-5-ulf.hansson@linaro.org |
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