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mmc_disk: disable currently non working code

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Switching to 4 bit mode requires some more coordination as the host
controller must also be switched, right after sending this command.

I will revisit this, but the previous commit was accidentally pushed to
master.

At least we get the 25MHz clock instead of 400kHz, that should already
be quite a performance improvement.
This commit is contained in:
Adrien Destugues 2021-01-12 22:47:58 +01:00
parent f8650bc2db
commit 2aa5a0353d
1 changed files with 2 additions and 0 deletions
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2
src/add-ons/kernel/drivers/disk/mmc/mmc_disk.cpp
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@ -170,6 +170,7 @@ mmc_block_get_geometry(mmc_disk_driver_info* info, device_geometry* geometry)
geometry->read_only = false; // TODO check write protect switch? geometry->read_only = false; // TODO check write protect switch?
geometry->write_once = false; geometry->write_once = false;
#if 0
// This function will be called before all data transfers, so we use this // This function will be called before all data transfers, so we use this
// opportunity to switch the card to 4-bit data transfers (instead of the // opportunity to switch the card to 4-bit data transfers (instead of the
// default 1 bit mode) // default 1 bit mode)
@ -179,6 +180,7 @@ mmc_block_get_geometry(mmc_disk_driver_info* info, device_geometry* geometry)
info->rca << 16, &cardStatus); info->rca << 16, &cardStatus);
info->mmc->execute_command(info->parent, info->rca, SD_SET_BUS_WIDTH, info->mmc->execute_command(info->parent, info->rca, SD_SET_BUS_WIDTH,
k4BitMode, &cardStatus); k4BitMode, &cardStatus);
#endif
return B_OK; return B_OK;
} }