Enable high-speed on the card before increasing frequency on the controller
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Authored by kibab on May 25 2018, 9:46 AM.

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rS334651: Enable high-speed on the card before increasing frequency on the controller

Summary

Increasing operating frequency without telling card to switch to high-speed mode first upsets some cards and generates CRC errors.
While here, deselect / reselect cards after CMD6 and SCR fetch, as in original code.

Test Plan

This diff enables normal operation for the following card: <SDHC SL16G 8.0 SN 19853490 MFG 01/2017> with Raspberry Pi 3 host.

Diff Detail

Repository

rS FreeBSD src repository - subversion

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Event Timeline

kibab created this revision.May 25 2018, 9:46 AM

Harbormaster completed remote builds in B16838: Diff 42975.May 25 2018, 9:46 AM

other than the minor style nits, this looks good.

sys/cam/mmc/mmc_da.c
904 ↗	(On Diff #42975)	style says this { is alone on the next line.
905 ↗	(On Diff #42975)	and no blank line here.

This revision is now accepted and ready to land.Jun 4 2018, 8:27 PM

kibab marked 2 inline comments as done.Jun 5 2018, 11:03 AM

Closed by commit rS334651: Enable high-speed on the card before increasing frequency on the controller (authored by kibab). · Explain WhyJun 5 2018, 11:03 AM

This revision was automatically updated to reflect the committed changes.

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Path

Size

head/

sys/

cam/

mmc/

mmc_da.c

70 lines

Diff 43332

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Enable high-speed on the card before increasing frequency on the controllerClosedPublicActions