mmc: sdhci-sprd: Add SD HS mode online tuning

Browse source

First of all, Unisoc's IC provides cmd delay and read delay to ensure
that the host can get the correct data. However, according to SD Spec,
there is no need to do tuning in high speed mode, but with the
development of chip processes, it is more and more difficult to find
a suitable delay to cover all the chips. Therefore, we need SD high
speed mode online tuning.

In addition, we added mmc_sd_switch() and mmc_send_status() to the
header file to allow it to be usable by the driver.

Signed-off-by: Wenchao Chen <wenchao.chen@unisoc.com>
Link: https://lore.kernel.org/r/20230825091743.15613-3-wenchao.chen@unisoc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

...

This commit is contained in:

Wenchao Chen 2023-08-25 17:17:43 +08:00 • committed by Ulf Hansson

parent bac806830f

commit d83d251bf3

1 changed files with 149 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

149

drivers/mmc/host/sdhci-sprd.c

View file