PCI: brcmstb: Fix broken brcm_pcie_mdio_write() polling

[ Upstream commit 039741a8d7c9a01c1bc84a5ac5aa770a5e138a30 ]

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/20240217133722.14391-1-wahrenst@gmx.net
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Acked-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

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;
 }