| Message ID | 20200219123933.2792-4-nsaenzjulienne@suse.de (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Lorenzo Pieralisi |
| Headers | show |
| Series | Raspberry Pi 4 VL805 firmware load support | expand |
On 2/19/20 4:39 AM, Nicolas Saenz Julienne wrote: > 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 > starting. > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> It does not look like there is something making sure that CONFIG_RASPBERRYPI_FIRMWARE is being selected or depended on, should we have a "default XHCI_PCI" added to drivers/firmware/Kconfig?
On Wed, 2020-02-19 at 11:21 -0800, Florian Fainelli wrote: > On 2/19/20 4:39 AM, Nicolas Saenz Julienne wrote: > > 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 > > starting. > > > > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > > Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> > > It does not look like there is something making sure that > CONFIG_RASPBERRYPI_FIRMWARE is being selected or depended on, should we > have a "default XHCI_PCI" added to drivers/firmware/Kconfig? I think having that would enable the firmware interface for all XHCI_PCI users, which isn't ideal. The firmware call has stubs for the case the firmware interace isn't compiled, so no problem there. Ultimately we want to enable CONFIG_RASPBERRYPI_FIRMWARE only when the built image targets the RPi4 (reglardless of being arm64/arm32). But I don't think that's feasible. Regards, Nicolas
On 2/20/2020 10:14 AM, Nicolas Saenz Julienne wrote: > On Wed, 2020-02-19 at 11:21 -0800, Florian Fainelli wrote: >> On 2/19/20 4:39 AM, Nicolas Saenz Julienne wrote: >>> 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 >>> starting. >>> >>> Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> >> >> Reviewed-by: Florian Fainelli <f.fainelli@gmail.com> >> >> It does not look like there is something making sure that >> CONFIG_RASPBERRYPI_FIRMWARE is being selected or depended on, should we >> have a "default XHCI_PCI" added to drivers/firmware/Kconfig? > > I think having that would enable the firmware interface for all XHCI_PCI users, > which isn't ideal. The firmware call has stubs for the case the firmware > interace isn't compiled, so no problem there. Ultimately we want to enable > CONFIG_RASPBERRYPI_FIRMWARE only when the built image targets the RPi4 > (reglardless of being arm64/arm32). But I don't think that's feasible. It would enable the driver, which is only functional if the matching Device Tree node is present, that seems like a reasonable price to pay for a multiplatform kernel. After all, this is a functional dependency for the Pi4.
diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c index d20aabc26273..9600052f768c 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 +919,24 @@ 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 the Raspberry Pi's firmware interface to be up + * as some PCI fixups depend on it. + */ + 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;
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 starting. Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> --- drivers/pci/controller/pcie-brcmstb.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)