From de508ece1d37cdbbbfa52f074954310f9b066b13 Mon Sep 17 00:00:00 2001 From: Helge Deller Date: Thu, 6 Aug 2026 17:04:15 +0200 Subject: [PATCH] sticon/parisc: Detect default STI graphics card for console output If a machine has multiple graphic cards, detect the graphic card which is used to display firmware messages and use that one as the default graphic card for sticon and fbcon. On parisc machines the default graphic card used for BCH (boot console handler, aka BIOS menu) is stored in the stable storage (equivalent to CMOS storage on x86) or in the console path in page zero. Extract that path and store it as default STI path for later comparism. Take care that the graphic card can be a GSC or a PCI card which use different path strings. Increase max string size for default_sti_path to 32 chars as the print_pa_hwpath() function formats a hardware path using unbounded sprintf calls for up to 6 bus converter components and 1 module component (e.g., 255/255/...), which can produce a string up to 28 bytes long. Signed-off-by: Helge Deller Cc: stable@vger.kernel.org --- drivers/video/sticore.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) diff --git a/drivers/video/sticore.c b/drivers/video/sticore.c index 0d37e4b10447..1d4477f20450 100644 --- a/drivers/video/sticore.c +++ b/drivers/video/sticore.c @@ -325,7 +325,7 @@ static void sti_rom_copy(unsigned long base, unsigned long count, void *dest) -static char default_sti_path[21] __read_mostly; +static char default_sti_path[32] __read_mostly; #ifndef MODULE static int __init sti_setup(char *str) @@ -1148,6 +1148,26 @@ static void sti_init_roms(void) pr_info("STI GSC/PCI core graphics driver " STI_DRIVERVERSION "\n"); + /* + * Find default console by hardware path which is either stored in + * console entry in stable storage or alternatively from console path + * in PAGE0 used by BCH and PDC. + */ + if (!default_sti_path[0]) { + struct pdc_module_path conspath; + struct device *dev = NULL; + + if (pdc_stable_read(0x60, &conspath, sizeof(conspath)) == PDC_OK) + dev = hwpath_to_device(&conspath.path); + if (!dev) + dev = hwpath_to_device(&PAGE0->mem_cons.dp.path); + if (dev && dev_is_pci(dev)) + print_pci_hwpath(to_pci_dev(dev), default_sti_path); + else if (dev && !dev_is_pci(dev)) + print_pa_hwpath(to_parisc_device(dev), default_sti_path); + pr_debug("default graphic card: %s\n", default_sti_path); + } + /* Register drivers for native & PCI cards */ register_parisc_driver(&pa_sti_driver); WARN_ON(pci_register_driver(&pci_sti_driver));