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kernel/USB-pci-quirks-Add-Raspberry-Pi-4-quirk.patch
Peter Robinson 964c3d3958 Update RPi4 USB quirks patch to latest
2020-05-07 14:17:39 +01:00

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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: f.fainelli@gmail.com, gregkh@linuxfoundation.org, wahrenst@gmx.net,
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Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Subject: [PATCH v8 1/4] soc: bcm2835: Add notify xHCI reset property
Date: Tue, 5 May 2020 18:13:14 +0200
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Cc: linux-pci@vger.kernel.org, tim.gover@raspberrypi.org,
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The property is needed in order to trigger VL805's firmware load. Note
that gap between the property introduced and the previous one is due to
the properties not being defined.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
include/soc/bcm2835/raspberrypi-firmware.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h
index 7800e12ee042..cc9cdbc66403 100644
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -90,7 +90,7 @@ enum rpi_firmware_property_tag {
RPI_FIRMWARE_SET_PERIPH_REG = 0x00038045,
RPI_FIRMWARE_GET_POE_HAT_VAL = 0x00030049,
RPI_FIRMWARE_SET_POE_HAT_VAL = 0x00030050,
-
+ RPI_FIRMWARE_NOTIFY_XHCI_RESET = 0x00030058,
/* Dispmanx TAGS */
RPI_FIRMWARE_FRAMEBUFFER_ALLOCATE = 0x00040001,
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To: f.fainelli@gmail.com, gregkh@linuxfoundation.org, wahrenst@gmx.net,
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Subject: [PATCH v8 2/4] firmware: raspberrypi: Introduce vl805 init routine
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Cc: linux-pci@vger.kernel.org, tim.gover@raspberrypi.org,
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The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip
that implements xHCI. After a PCI reset, VL805's firmware may either be
loaded directly from an EEPROM or, if not present, by the SoC's
co-processor, VideoCore. RPi4's VideoCore OS contains both the non public
firmware load logic and the VL805 firmware blob. The function this patch
introduces triggers the aforementioned process.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
Change since v7:
- Use usleep_delay()
- Add comment about PCI errors
- Don't wait on error
- Typos
Change since v6:
- Add test to avoid loading the firmware when not needed
- Since we have it around, print VL805's firmware version, it'll make
debugging easier in the future
- Correct typos
- Add a clearer view of HW topology in patch description
Changes since v4:
- Inline function definition when RASPBERRYPI_FIRMWARE is not defined
Changes since v1:
- Move include into .c file and add forward declaration to .h
drivers/firmware/raspberrypi.c | 61 ++++++++++++++++++++++
include/soc/bcm2835/raspberrypi-firmware.h | 7 +++
2 files changed, 68 insertions(+)
diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c
index da26a584dca0..a166ad0cec2c 100644
--- a/drivers/firmware/raspberrypi.c
+++ b/drivers/firmware/raspberrypi.c
@@ -12,6 +12,8 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/slab.h>
+#include <linux/pci.h>
+#include <linux/delay.h>
#include <soc/bcm2835/raspberrypi-firmware.h>
#define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf))
@@ -19,6 +21,8 @@
#define MBOX_DATA28(msg) ((msg) & ~0xf)
#define MBOX_CHAN_PROPERTY 8
+#define VL805_PCI_CONFIG_VERSION_OFFSET 0x50
+
static struct platform_device *rpi_hwmon;
static struct platform_device *rpi_clk;
@@ -286,6 +290,63 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node)
}
EXPORT_SYMBOL_GPL(rpi_firmware_get);
+/*
+ * The Raspberry Pi 4 gets its USB functionality from VL805, a PCIe chip that
+ * implements xHCI. After a PCI reset, VL805's firmware may either be loaded
+ * directly from an EEPROM or, if not present, by the SoC's co-processor,
+ * VideoCore. RPi4's VideoCore OS contains both the non public firmware load
+ * logic and the VL805 firmware blob. This function triggers the aforementioned
+ * process.
+ */
+int rpi_firmware_init_vl805(struct pci_dev *pdev)
+{
+ struct device_node *fw_np;
+ struct rpi_firmware *fw;
+ u32 dev_addr, version;
+ int ret;
+
+ fw_np = of_find_compatible_node(NULL, NULL,
+ "raspberrypi,bcm2835-firmware");
+ if (!fw_np)
+ return 0;
+
+ fw = rpi_firmware_get(fw_np);
+ of_node_put(fw_np);
+ if (!fw)
+ return -ENODEV;
+
+ /*
+ * Make sure we don't trigger a firmware load unnecessarily.
+ *
+ * If something went wrong with PCI, this whole exercise would be
+ * futile as VideoCore expects from us a configured PCI bus. Just take
+ * the faulty version (likely ~0) and let xHCI's registration fail
+ * further down the line.
+ */
+ pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET, &version);
+ if (version)
+ goto exit;
+
+ dev_addr = pdev->bus->number << 20 | PCI_SLOT(pdev->devfn) << 15 |
+ PCI_FUNC(pdev->devfn) << 12;
+
+ ret = rpi_firmware_property(fw, RPI_FIRMWARE_NOTIFY_XHCI_RESET,
+ &dev_addr, sizeof(dev_addr));
+ if (ret)
+ return ret;
+
+ /* Wait for vl805 to startup */
+ usleep_range(200, 1000);
+
+ pci_read_config_dword(pdev, VL805_PCI_CONFIG_VERSION_OFFSET,
+ &version);
+exit:
+ pci_info(pdev, "VL805 firmware version %08x\n", version);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(rpi_firmware_init_vl805);
+
static const struct of_device_id rpi_firmware_of_match[] = {
{ .compatible = "raspberrypi,bcm2835-firmware", },
{},
diff --git a/include/soc/bcm2835/raspberrypi-firmware.h b/include/soc/bcm2835/raspberrypi-firmware.h
index cc9cdbc66403..3025aca3c358 100644
--- a/include/soc/bcm2835/raspberrypi-firmware.h
+++ b/include/soc/bcm2835/raspberrypi-firmware.h
@@ -10,6 +10,7 @@
#include <linux/of_device.h>
struct rpi_firmware;
+struct pci_dev;
enum rpi_firmware_property_status {
RPI_FIRMWARE_STATUS_REQUEST = 0,
@@ -141,6 +142,7 @@ int rpi_firmware_property(struct rpi_firmware *fw,
int rpi_firmware_property_list(struct rpi_firmware *fw,
void *data, size_t tag_size);
struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node);
+int rpi_firmware_init_vl805(struct pci_dev *pdev);
#else
static inline int rpi_firmware_property(struct rpi_firmware *fw, u32 tag,
void *data, size_t len)
@@ -158,6 +160,11 @@ static inline struct rpi_firmware *rpi_firmware_get(struct device_node *firmware
{
return NULL;
}
+
+static inline int rpi_firmware_init_vl805(struct pci_dev *pdev)
+{
+ return 0;
+}
#endif
#endif /* __SOC_RASPBERRY_FIRMWARE_H__ */
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: f.fainelli@gmail.com, gregkh@linuxfoundation.org, wahrenst@gmx.net,
helgaas@kernel.org, linux-kernel@vger.kernel.org,
Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Rob Herring <robh@kernel.org>, bcm-kernel-feedback-list@broadcom.com
Subject: [PATCH v8 3/4] PCI: brcmstb: Wait for Raspberry Pi's firmware when
present
Date: Tue, 5 May 2020 18:13:16 +0200
Message-Id: <20200505161318.26200-4-nsaenzjulienne@suse.de>
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Cc: tim.gover@raspberrypi.org, linux-pci@vger.kernel.org,
linux-usb@vger.kernel.org, linux-rpi-kernel@lists.infradead.org,
Bjorn Helgaas <bhelgaas@google.com>, linux-arm-kernel@lists.infradead.org
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xHCI's PCI fixup, run at the end of pcie-brcmstb's probe, depends on
RPi4's VideoCore firmware interface to be up and running. It's possible
for both initializations to race, so make sure it's available prior to
starting.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
---
Changes since v6:
- Add more complete comment
drivers/pci/controller/pcie-brcmstb.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 6d79d14527a6..0b97b94c4a9a 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -28,6 +28,8 @@
#include <linux/string.h>
#include <linux/types.h>
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
#include "../pci.h"
/* BRCM_PCIE_CAP_REGS - Offset for the mandatory capability config regs */
@@ -917,11 +919,26 @@ static int brcm_pcie_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node, *msi_np;
struct pci_host_bridge *bridge;
+ struct device_node *fw_np;
struct brcm_pcie *pcie;
struct pci_bus *child;
struct resource *res;
int ret;
+ /*
+ * We have to wait for Raspberry Pi's firmware interface to be up as a
+ * PCI fixup, rpi_firmware_init_vl805(), depends on it. This driver's
+ * probe can race with the firmware interface's (see
+ * drivers/firmware/raspberrypi.c) and potentially break the PCI fixup.
+ */
+ fw_np = of_find_compatible_node(NULL, NULL,
+ "raspberrypi,bcm2835-firmware");
+ if (fw_np && !rpi_firmware_get(fw_np)) {
+ of_node_put(fw_np);
+ return -EPROBE_DEFER;
+ }
+ of_node_put(fw_np);
+
bridge = devm_pci_alloc_host_bridge(&pdev->dev, sizeof(*pcie));
if (!bridge)
return -ENOMEM;
From patchwork Tue May 5 16:13:17 2020
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
To: f.fainelli@gmail.com, gregkh@linuxfoundation.org, wahrenst@gmx.net,
helgaas@kernel.org, linux-kernel@vger.kernel.org,
Mathias Nyman <mathias.nyman@intel.com>
Subject: [PATCH v8 4/4] USB: pci-quirks: Add Raspberry Pi 4 quirk
Date: Tue, 5 May 2020 18:13:17 +0200
Message-Id: <20200505161318.26200-5-nsaenzjulienne@suse.de>
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Cc: tim.gover@raspberrypi.org, linux-pci@vger.kernel.org,
linux-usb@vger.kernel.org, Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
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On the Raspberry Pi 4, after a PCI reset, VL805's firmware may either be
loaded directly from an EEPROM or, if not present, by the SoC's
VideoCore. Inform VideoCore that VL805 was just reset.
Also, as this creates a dependency between USB_PCI and VideoCore's
firmware interface, and since USB_PCI can't be set as a module neither
this can. Reflect that on the firmware interface Kconfg.
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
Changes since v5:
- Fix Kconfig issue with allmodconfig
Changes since v4:
- Do not split up error message
Changes since v3:
- Add more complete error message
Changes since v1:
- Make RASPBERRYPI_FIRMWARE dependent on this quirk to make sure it
gets compiled when needed.
drivers/firmware/Kconfig | 3 ++-
drivers/usb/host/pci-quirks.c | 16 ++++++++++++++++
2 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/firmware/Kconfig b/drivers/firmware/Kconfig
index 8007d4aa76dc..b42140cff8ac 100644
--- a/drivers/firmware/Kconfig
+++ b/drivers/firmware/Kconfig
@@ -178,8 +178,9 @@ config ISCSI_IBFT
Otherwise, say N.
config RASPBERRYPI_FIRMWARE
- tristate "Raspberry Pi Firmware Driver"
+ bool "Raspberry Pi Firmware Driver"
depends on BCM2835_MBOX
+ default USB_PCI
help
This option enables support for communicating with the firmware on the
Raspberry Pi.
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c
index 92150ecdb036..0b949acfa258 100644
--- a/drivers/usb/host/pci-quirks.c
+++ b/drivers/usb/host/pci-quirks.c
@@ -16,6 +16,9 @@
#include <linux/export.h>
#include <linux/acpi.h>
#include <linux/dmi.h>
+
+#include <soc/bcm2835/raspberrypi-firmware.h>
+
#include "pci-quirks.h"
#include "xhci-ext-caps.h"
@@ -1243,11 +1246,24 @@ static void quirk_usb_handoff_xhci(struct pci_dev *pdev)
static void quirk_usb_early_handoff(struct pci_dev *pdev)
{
+ int ret;
+
/* Skip Netlogic mips SoC's internal PCI USB controller.
* This device does not need/support EHCI/OHCI handoff
*/
if (pdev->vendor == 0x184e) /* vendor Netlogic */
return;
+
+ if (pdev->vendor == PCI_VENDOR_ID_VIA && pdev->device == 0x3483) {
+ ret = rpi_firmware_init_vl805(pdev);
+ if (ret) {
+ /* Firmware might be outdated, or something failed */
+ dev_warn(&pdev->dev,
+ "Failed to load VL805's firmware: %d. Will continue to attempt to work, but bad things might happen. You should fix this...\n",
+ ret);
+ }
+ }
+
if (pdev->class != PCI_CLASS_SERIAL_USB_UHCI &&
pdev->class != PCI_CLASS_SERIAL_USB_OHCI &&
pdev->class != PCI_CLASS_SERIAL_USB_EHCI &&
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