improve mmc init sequence
Hello Ulf,
I notice we add MMC_CAP2_NO_SDIO to avoid sending sdio commands during
initialization. So that means we can use it to improve mmc init
sequence if a specific board use one slot just for emmc or sd. But I realize that we can move a step further to add more cap2 like NO_SD/ NO_MMC in order to reduce the boot time. Does that make sense? If the
answer is *yes*, I am happy to push some patches for it since I have
been doing it on my local tree and testing for a long time.
Signature · 2 lines
Best Regards Shawn Lin
Quoted 8 lines · Shawn Lin
Hello Ulf,
I notice we addMMC_CAP2_NO_SDIOto avoid sending sdio commands
during initialization. So that means we can use it to improve mmc init sequence if a specific board use one slot just for emmc or sd. But I realize that we can move a step further to add more cap2 like NO_SD/NO_MMCin order to reduce the boot time. Does that make sense? If the answer is *yes*, I am happy to push some patches for it since I have been doing it on my local tree and testing for a long time.
I am not against it, so please go ahead!
Although, you need to give some proof of the amount of saved boot time (or better the decreased initialization time of a couple of different cards).
Kind regards
Uffe
Quoted 10 lines · Ulf Hansson
Quoted 8 lines · Shawn Lin
Hello Ulf,
I notice we addMMC_CAP2_NO_SDIOto avoid sending sdio commands
during initialization. So that means we can use it to improve mmc init sequence if a specific board use one slot just for emmc or sd. But I realize that we can move a step further to add more cap2 like NO_SD/NO_MMCin order to reduce the boot time. Does that make sense? If the answer is *yes*, I am happy to push some patches for it since I have been doing it on my local tree and testing for a long time.
Quoted 5 lines
I am not against it, so please go ahead!
Although, you need to give some proof of the amount of saved boot time (or better the decreased initialization time of a couple of different cards).
I have already tested with similar sequence..I have remembered there is a benefit for decreasing the booting time. But i didn't remember how much time is decreased...because it wast too long time ago.
Best Regards,
Jaehoon Chung
Quoted 9 lines
Kind regards
Uffe
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