File 0022-usb-xhci-Add-missing-cache-flush-in.patch of Package u-boot.16976

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File 0022-usb-xhci-Add-missing-cache-flush-in.patch of Package u-boot.16976

From 92a2d04e443ce6e8b68e8746a745e688a094681f Mon Sep 17 00:00:00 2001
From: Sylwester Nawrocki <s.nawrocki@samsung.com>
Date: Mon, 4 May 2020 14:45:14 +0200
Subject: [PATCH] usb: xhci: Add missing cache flush in the scratchpad array
 initialization

In current code there is no cache flush after initializing the scratchpad
buffer array with the scratchpad buffer pointers. This leads to a failure
of the "slot enable" command on the rpi4 board (Broadcom STB PCIe
controller + VL805 USB hub) - the very first TRB transfer on the command
ring fails and there is a timeout while waiting for the command completion
event. After adding the missing cache flush everything seems to be working
as expected.

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 drivers/usb/host/xhci-mem.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c
index 93450ee3b7..729bdc3c84 100644
--- a/drivers/usb/host/xhci-mem.c
+++ b/drivers/usb/host/xhci-mem.c
@@ -393,6 +393,9 @@ static int xhci_scratchpad_alloc(struct xhci_ctrl *ctrl)
 		scratchpad->sp_array[i] = cpu_to_le64(ptr);
 	}
 
+	xhci_flush_cache((uintptr_t)scratchpad->sp_array,
+			 sizeof(u64) * num_sp);
+
 	return 0;
 
 fail_sp3:

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File 0022-usb-xhci-Add-missing-cache-flush-in.patch of Package u-boot.16976

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