[PATCH v1 0/2] Improve eMMC performance for the StarFive JHB100 SoC

[Changhuang Liang]

This series implements a generic interface to configure CIT based on
time (ns). Different platforms can improve MMC performance by
configuring their respective CIT. This series has been tested on the
JHB100 SoC.

before:
dd if=/dev/mmcblk0 of=/dev/null bs=1M count=800
838860800 bytes (839 MB, 800 MiB) copied, 9.38511 s, 89.4 MB/s
dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=800
838860800 bytes (839 MB, 800 MiB) copied, 12.2127 s, 68.7 MB/s

after:
dd if=/dev/mmcblk0 of=/dev/null bs=1M count=800
838860800 bytes (839 MB, 800 MiB) copied, 3.19472 s, 263 MB/s
dd if=/dev/zero of=/dev/mmcblk0 bs=1M count=800
838860800 bytes (839 MB, 800 MiB) copied, 10.7587 s, 78.0 MB/s

This series depends on series:
https://lore.kernel.org/all/20260930103258.13375-1-changhuang.liang@xxxxxxxxxxxxxxxx/

Changhuang Liang (2):
  mmc: cqhci: Add support for setting command idle time in nanoseconds
  mmc: sdhci-of-dwcmshc: Set CQHCI command idle time for StarFive JHB100

 drivers/mmc/host/cqhci-core.c       | 60 +++++++++++++++++++++++++++++
 drivers/mmc/host/cqhci.h            |  6 +++
 drivers/mmc/host/sdhci-of-dwcmshc.c | 22 +++++++++++
 3 files changed, 88 insertions(+)

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2.25.1