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title: SDHI; mmc_send_abort_tuning needs refactorization to support SD cards
team: IO
key: 2df07932-117d-11ec-bc26-4ffb07de7674
assignee: Wolfram
status: Active
bsp51x:
- 2d7c017355ce83b26ef739183f28a8e0da5ea233 # mmc: core: mmc_ops: Enable stop command
upstream:
comments:
- details at lore.kernel.org/all/20210831133349.18203-1-wsa+renesas@sang-engineering.com/
- v1; https://lore.kernel.org/r/20210914182023.8103-1-wsa+renesas@sang-engineering.com
- upstream review hinted that this might be only a workaround
- one alternative found by Wolfram is to delay 100ms after the cmd error
- for Wolfram's setup, the issue only happens with 4tap devices and a SanDisk card
- another alternative seems to use the 1:4 divider instead of the 2:2
- needs further investigation
- BSP team reports that the 1:4 divider doesn't work for them
- next step is discover why the 100ms delay works and if we can find a better condition to wait for
- Wolfram got a reliably failing SD card from another user of Renesas hardware
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