On 1/28/22 08:30, Jaehoon Chung wrote:
Hi Marek,
Hi,
On 1/28/22 12:40, Marek Vasut wrote:
This reverts commit b5874b552ffa09bc1dc5dec6b5dd376c62dab45d.
It seems the iMX8MM SDHC controller always reports DAT0 line status
as zero after voltage switch at the end of mmc_switch_voltage(), even
if it is supposed to be high and scope confirms the DAT0 is high.
Reverting this patch makes SDR104 work on iMX8MM, however, it is
not clear why the DAT0 status is not correctly reported by the
controller.
I didn't have an imx8mm board, so I wonder that other boards which is using
fsl_esdhci_imx driver have same problem.
I have multiple 8mm, just not the 8mm-evk.
I'm not sure...I remember that some controller doesn't support a busy signal.
In kernel driver, also doesn't report correct status?
Kernel doesn't use this DAT0 readback, that's why it works in kernel.
U-Boot has been augmented with this DAT0 readback some time ago, I just
noticed it on an 8mm board recently that it doesn't really work. There
is also no errata.
I think it would be good to have NXP check this.
