[PATCH] imx8m: fix reading of DDR4 MR registers [again]

[sbabic@denx.de]

> Commit 290ffe5788 (imx8m: fix reading of DDR4 MR registers) lifted a
> private definition of lpddr4_mr_read() from imx8mm-cl-iot-gate board
> code to drivers/ddr/imx/imx8m/ddrphy_utils.c, because that version
> actually seems to work in practice.
> However, commit 99c7cc58e1 (ddr: imx: Add i.MX9 DDR controller driver)
> reintroduced the broken version in drivers/ddr/imx/imx8m/ddr_init.c,
> copied most of the rest of ddrphy_utils.c to
> drivers/ddr/imx/phy/ddrphy_utils.c, and stopped building
> drivers/ddr/imx/imx8m/ddrphy_utils.c [and that file was then finally
> completely removed with 7e9bd84883 (imx8m: ddrphy_utils: Remove unused
> file)].
> I assume this must have broken the imx8mm-cl-iot-gate board, at least
> those that have not had their eeprom programmed with the proper
> information. It certainly did break our out-of-tree board which always
> reads back the ID register and uses that for a sanity check.
> So apply the fix from 290ffe5788 once again.
> Fixes: 99c7cc58e1 (ddr: imx: Add i.MX9 DDR controller driver)
> Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
> Reviewed-by: Fabio Estevam <festevam@denx.de>
Applied to u-boot-imx, master, thanks !

Best regards,
Stefano Babic

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