linux-kernel - [PATCH v2 2/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware

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Date:   Thu, 30 Apr 2020 15:04:33 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     mbrugger@...e.com, u-boot@...ts.denx.de, bmeng.cn@...il.com,
        marex@...x.de, linux-kernel@...r.kernel.org
Cc:     sjg@...omium.org, m.szyprowski@...sung.com, s.nawrocki@...sung.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
Subject: [PATCH v2 2/2] usb: xhci: Load Raspberry Pi 4 VL805's firmware

When needed, RPi4's co-processor (called VideoCore) has to be instructed
to load VL805's firmware (the chip providing xHCI support). VideoCore's
firmware expects the board's PCIe bus to be already configured in order
for it to load the xHCI chip firmware. So we have to make sure this
happens in between the PCIe configuration and xHCI startup.

Introduce a callback in xhci_pci_probe() to run this platform specific
routine.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>

---

Changes since v1:
 - Create callback

 board/raspberrypi/rpi/rpi.c | 12 ++++++++++++
 drivers/usb/host/xhci-pci.c |  6 ++++++
 include/usb/xhci.h          |  3 +++
 3 files changed, 21 insertions(+)

diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index e367ba3092..8aa78d1f48 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -14,6 +14,7 @@
 #include <lcd.h>
 #include <memalign.h>
 #include <mmc.h>
+#include <usb/xhci.h>
 #include <asm/gpio.h>
 #include <asm/arch/mbox.h>
 #include <asm/arch/msg.h>
@@ -494,3 +495,14 @@ int ft_board_setup(void *blob, bd_t *bd)
 
 	return 0;
 }
+
+#ifdef CONFIG_BCM2711
+void xhci_pci_fixup(struct udevice *dev)
+{
+	int ret;
+
+	ret = bcm2711_notify_vl805_reset();
+	if (ret)
+		printf("RPI: Failed to notify VideoCore about vl805's firmware\n");
+}
+#endif
diff --git a/drivers/usb/host/xhci-pci.c b/drivers/usb/host/xhci-pci.c
index c1f60da541..1285dde1ef 100644
--- a/drivers/usb/host/xhci-pci.c
+++ b/drivers/usb/host/xhci-pci.c
@@ -11,6 +11,10 @@
 #include <usb.h>
 #include <usb/xhci.h>
 
+__weak void xhci_pci_fixup(struct udevice *dev)
+{
+}
+
 static void xhci_pci_init(struct udevice *dev, struct xhci_hccr **ret_hccr,
 			  struct xhci_hcor **ret_hcor)
 {
@@ -40,6 +44,8 @@ static int xhci_pci_probe(struct udevice *dev)
 	struct xhci_hccr *hccr;
 	struct xhci_hcor *hcor;
 
+	xhci_pci_fixup(dev);
+
 	xhci_pci_init(dev, &hccr, &hcor);
 
 	return xhci_register(dev, hccr, hcor);
diff --git a/include/usb/xhci.h b/include/usb/xhci.h
index c16106a2fc..57feed7603 100644
--- a/include/usb/xhci.h
+++ b/include/usb/xhci.h
@@ -16,6 +16,7 @@
 #ifndef HOST_XHCI_H_
 #define HOST_XHCI_H_
 
+#include <usb.h>
 #include <asm/types.h>
 #include <asm/cache.h>
 #include <asm/io.h>
@@ -1281,4 +1282,6 @@ extern struct dm_usb_ops xhci_usb_ops;
 
 struct xhci_ctrl *xhci_get_ctrl(struct usb_device *udev);
 
+extern void xhci_pci_fixup(struct udevice *dev);
+
 #endif /* HOST_XHCI_H_ */
-- 
2.26.2