PCI: brcmstb: Fix broken brcm_pcie_mdio_write() polling

The MDIO_WT_DONE() macro tests bit 31, which is always 0 (== done) as
readw_poll_timeout_atomic() does a 16-bit read. Replace with the readl
variant.

[kwilczynski: commit log]
Fixes: ca5dcc7 ("PCI: brcmstb: Replace status loops with read_poll_timeout_atomic()")
Link: https://lore.kernel.org/linux-pci/[email protected]
Signed-off-by: Jonathan Bell <[email protected]>
Signed-off-by: Stefan Wahren <[email protected]>
Signed-off-by: Krzysztof Wilczyński <[email protected]>
Acked-by: Florian Fainelli <[email protected]>

Author: P33M

drivers/pci/controller/pcie-brcmstb.c

@@ -336,7 +336,7 @@ static int brcm_pcie_mdio_write(void __iomem *base, u8 port,
 	readl(base + PCIE_RC_DL_MDIO_ADDR);
 	writel(MDIO_DATA_DONE_MASK | wrdata, base + PCIE_RC_DL_MDIO_WR_DATA);
 
-	err = readw_poll_timeout_atomic(base + PCIE_RC_DL_MDIO_WR_DATA, data,
+	err = readl_poll_timeout_atomic(base + PCIE_RC_DL_MDIO_WR_DATA, data,
 					MDIO_WT_DONE(data), 10, 100);
 	return err;
 }