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| author | Haibo Chen <haibo.chen@nxp.com> | 2022-12-23 10:50:22 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2023-01-23 15:51:38 +0100 |
| commit | 52e4c32baed2a4c79e20a82dc22e307499759852 (patch) | |
| tree | 778fe168132da02848e7fee643d963825d072d9f /Documentation/devicetree | |
| parent | c8c49a5a0b2be2da993cee2a2d7fbb5994e47d7a (diff) | |
| download | lwn-52e4c32baed2a4c79e20a82dc22e307499759852.tar.gz lwn-52e4c32baed2a4c79e20a82dc22e307499759852.zip | |
mmc: sdhci-esdhc-imx: only enable DAT[0] and CMD line auto tuning for SDIO device
USDHC IP has one limitation: the tuning circuit can't handle the async
sdio device interrupt correctly. When sdio device use 4 data lines,
async sdio interrupt will use the shared DAT[1], if enable auto tuning
circuit to check these 4 data lines, include the DAT[1], this circuit
will detect this interrupt, take this as data on DAT[1], and adjust the
delay cell wrongly, finally will cause the DATA/CMD CRC error.
So for SDIO device, only enable DAT[0] and CMD line for auto tuning.
To distinguish the card type during card init, involve init_card().
Signed-off-by: Haibo Chen <haibo.chen@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Link: https://lore.kernel.org/r/20221223025022.1893102-3-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'Documentation/devicetree')
0 files changed, 0 insertions, 0 deletions