mmc0: Invalid maximum block size, assuming 512 bytes

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Hello,

My SoC provides an Arasan SDIO/eMMC controller supported by the
drivers/mmc/host/sdhci-of-arasan.c driver.

At init, the driver prints a warning to the console:

[    0.887301] sdhci: Secure Digital Host Controller Interface driver
[    0.893537] sdhci: Copyright(c) Pierre Ossman
[    0.897928] sdhci-pltfm: SDHCI platform and OF driver helper
[    0.903903] sdhci-arasan 21000.mmc: No vmmc regulator found
[    0.909537] sdhci-arasan 21000.mmc: No vqmmc regulator found
[    0.915247] mmc0: Invalid maximum block size, assuming 512 bytes
[    0.953797] mmc0: SDHCI controller on 21000.mmc [21000.mmc] using ADMA
[    0.961494] sdhci-arasan 21200.mmc: No vmmc regulator found
[    0.967110] sdhci-arasan 21200.mmc: No vqmmc regulator found

Is "mmc0: Invalid maximum block size, assuming 512 bytes" something
serious which requires investigating, in your experience?

The corresponding DT is:

mmc0: mmc@21000 {
	compatible = "arasan,sdhci-8.9a";
	reg = <0x21000 0x200>;
	clock-names = "clk_xin", "clk_ahb";
	clocks = <&sdio_clk>, <&clkgen 1>;
	interrupts = <60 IRQ_TYPE_LEVEL_HIGH>;
};

Regards.
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