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NXP used to setup the gpmi clock root from gpmi_clk in early versions
in their downstream BSP. [1]
However on mainline the gpmi clock root was always setup from enfc
since the beginning of the i.MX 6 series SoCs, which is still the same
today. [2]
NXP followed the mainline approach at some point and changed
setup_gpmi_io_clk to setup gpmi clock root from enfc which left faulty
code behind in our board file. [3]
This commit follows the change of NXP as it improves the performance of
the NAND from ~1.2 MiB/s to ~12 MiB/s. [3]
This change was verified to work in recovery-mode and u-boot loaded
from NAND on all four Colibri iMX6ULL SKUs from Toradex.
The frequency used to read the NAND, measured on RE# (Read Enable):
before this patch: 1.4 MHz
after this patch: 22 MHz
in Linux Kernel: 50 MHz
[1] https://source.codeaurora.org/external/imx/uboot-imx/tree/arch/arm/cpu/armv7/mx6/clock.c?h=nxp/imx_v2016.03_4.1.15_2.0.0_ga#n62
[2] commit
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| .. | ||
| apalis-imx8 | ||
| apalis-imx8x | ||
| apalis-tk1 | ||
| apalis_imx6 | ||
| apalis_t30 | ||
| colibri-imx6ull | ||
| colibri-imx8x | ||
| colibri_imx6 | ||
| colibri_imx7 | ||
| colibri_pxa270 | ||
| colibri_t20 | ||
| colibri_t30 | ||
| colibri_vf | ||
| common | ||
| verdin-imx8mm | ||