Re: [PATCH 5/9] spi: amd: Refactor amd_spi_busy_wait to use readl_poll_timeout

[Mark Brown]

On Tue, Aug 24, 2021 at 11:40:37AM +0100, Lucas Tanure wrote:

> -	spi_busy = (ioread32((u8 __iomem *)amd_spi->io_remap_addr +
> -		    AMD_SPI_CTRL0_REG) & AMD_SPI_BUSY) == AMD_SPI_BUSY;

This does ioread32() while readl_poll_timeout() does a readl().  These
are almost but not quite equivalent and the differences apply to PCI
devices like this one, see device-io.rst.

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