diff options
Diffstat (limited to '0001-firmware-raspberrypi-Introduce-vl805-init-routine.patch')
| -rw-r--r-- | 0001-firmware-raspberrypi-Introduce-vl805-init-routine.patch | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/0001-firmware-raspberrypi-Introduce-vl805-init-routine.patch b/0001-firmware-raspberrypi-Introduce-vl805-init-routine.patch new file mode 100644 index 000000000..db8a4a16c --- /dev/null +++ b/0001-firmware-raspberrypi-Introduce-vl805-init-routine.patch @@ -0,0 +1,110 @@ +From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 +From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Date: Tue, 10 Mar 2020 13:52:40 +0100 +Subject: [PATCH] firmware: raspberrypi: Introduce vl805 init routine + +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 +VideCore. The function informs VideCore that VL805 was just reset, or +requests for a probe defer. + +Based on Tim Gover's downstream implementation. + +Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> +Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> +--- + drivers/firmware/raspberrypi.c | 38 ++++++++++++++++++++++ + include/soc/bcm2835/raspberrypi-firmware.h | 7 ++++ + 2 files changed, 45 insertions(+) + +diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c +index da26a584dca0..cbb495aff6a0 100644 +--- a/drivers/firmware/raspberrypi.c ++++ b/drivers/firmware/raspberrypi.c +@@ -12,6 +12,7 @@ + #include <linux/of_platform.h> + #include <linux/platform_device.h> + #include <linux/slab.h> ++#include <linux/pci.h> + #include <soc/bcm2835/raspberrypi-firmware.h> + + #define MBOX_MSG(chan, data28) (((data28) & ~0xf) | ((chan) & 0xf)) +@@ -286,6 +287,43 @@ struct rpi_firmware *rpi_firmware_get(struct device_node *firmware_node) + } + EXPORT_SYMBOL_GPL(rpi_firmware_get); + ++/* ++ * 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 VideCore. ++ * Inform VideCore that VL805 was just reset, or defer xhci's probe if not yet ++ * joinable trough the mailbox interface. ++ */ ++int rpi_firmware_init_vl805(struct pci_dev *pdev) ++{ ++ struct device_node *fw_np; ++ struct rpi_firmware *fw; ++ u32 dev_addr; ++ 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 -EPROBE_DEFER; ++ ++ 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; ++ ++ dev_dbg(&pdev->dev, "loaded Raspberry Pi's VL805 firmware\n"); ++ ++ 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__ */ +-- +2.26.2 + |