Hi John,
On Wed, Feb 11, 2015 at 10:24 PM, John Tobias <[email protected]> wrote:
> Hello All,
>
> We interface the WiLink8 (http://www.ti.com/lit/gpn/wl1807mod) in iMX6
> custom board. The VIO is 1.8v and the kernel detect the chip in high
> speed mode with a signal voltage of 3.3v.
>
> Is there a way to force the kernel to use a 1.8v signal voltage?.
In drivers/mmc/core/sdio.c, function mmc_sdio_init_card() has:
/*
* If the host and card support UHS-I mode request the card
* to switch to 1.8V signaling level. No 1.8v signalling if
* UHS mode is not enabled to maintain compatibility and some
* systems that claim 1.8v signalling in fact do not support
* it.
*/
if (!powered_resume && (rocr & ocr & R4_18V_PRESENT)) {
err = mmc_set_signal_voltage(host, MMC_SIGNAL_VOLTAGE_180,
ocr);
Can you add a printk to check if mmc_set_signal_voltage() is getting called?
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