mmc: rtsx_pci_sdmmc: increase power-on settling delay to 5ms

[ Upstream commit aced969 ]

The existing 1ms delay in sd_power_on is insufficient and causes resume
errors around 4% of the time.

Increasing the delay to 5ms resolves this issue after testing 300
s2idle cycles.

Fixes: 1f311c9 ("mmc: rtsx: add 74 Clocks in power on flow")
Signed-off-by: Matthew Schwartz <matthew.schwartz@linux.dev>
Link: https://patch.msgid.link/20260105060236.400366-3-matthew.schwartz@linux.dev
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

Author: matte-schwartz

drivers/mmc/host/rtsx_pci_sdmmc.c

@@ -938,7 +938,7 @@ static int sd_power_on(struct realtek_pci_sdmmc *host, unsigned char power_mode)
 	if (err < 0)
 		return err;
 
-	mdelay(1);
+	mdelay(5);
 
 	err = rtsx_pci_write_register(pcr, CARD_OE, SD_OUTPUT_EN, SD_OUTPUT_EN);
 	if (err < 0)