Improve the SDIO tuning algorithm to increase stability and
performance under low-temperature conditions.
Signed-off-by: Swee Aun Khor <sakhor@efinixinc.com>
The driver supports UHS-I bus speed modes: SDR25, DDR50, and SDR104.
By default, the controller operates in SDR25 mode. Higher-speed modes
can be enabled via the Device Tree by adding the following properties
to the SDIO node:
- sd-uhs-ddr50
- sd-uhs-sdr104
When these properties are present, the driver negotiates the highest
supported UHS mode with the card and host.
Signed-off-by: Swee Aun Khor <sakhor@efinixinc.com>
