89 lines
2.9 KiB
Diff
89 lines
2.9 KiB
Diff
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From: Ben Hutchings <ben@decadent.org.uk>
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Subject: radeon, amdgpu: Firmware is required for DRM and KMS on R600 onward
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Date: Tue, 08 Jan 2013 03:25:52 +0000
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Bug-Debian: https://bugs.debian.org/607194
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Bug-Debian: https://bugs.debian.org/607471
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Bug-Debian: https://bugs.debian.org/610851
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Bug-Debian: https://bugs.debian.org/627497
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Bug-Debian: https://bugs.debian.org/632212
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Bug-Debian: https://bugs.debian.org/637943
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Bug-Debian: https://bugs.debian.org/649448
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Bug-Debian: https://bugs.debian.org/697229
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Bug-Debian: https://bugs.debian.org/1053764
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Forwarded: no
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Last-Update: 2023-11-08
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radeon requires firmware/microcode for the GPU in all chips, but for
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newer chips (apparently R600 'Evergreen' onward) it also expects
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firmware for the memory controller and other sub-blocks.
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radeon attempts to gracefully fall back and disable some features if
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the firmware is not available, but becomes unstable - the framebuffer
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and/or system memory may be corrupted, or the display may stay black.
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Therefore, perform a basic check for the existence of
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/lib/firmware/radeon when a device is probed, and abort if it
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is missing, except for the pre-R600 case.
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Update 2023-11-08:
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In bug 1053764 Mario Limonciello <mario.limonciello@amd.com> states
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that the patch isn't needed anymore for amdgpu, so remove that part
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of the patch
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---
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drivers/gpu/drm/radeon/radeon_drv.c | 30 +++++++++++++++++++++++++
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1 files changed, 30 insertions(+)
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--- a/drivers/gpu/drm/radeon/radeon_drv.c
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+++ b/drivers/gpu/drm/radeon/radeon_drv.c
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@@ -32,6 +32,8 @@
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#include <linux/compat.h>
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#include <linux/module.h>
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+#include <linux/namei.h>
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+#include <linux/path.h>
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#include <linux/pm_runtime.h>
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#include <linux/vga_switcheroo.h>
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#include <linux/mmu_notifier.h>
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@@ -255,6 +257,28 @@ MODULE_DEVICE_TABLE(pci, pciidlist);
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static const struct drm_driver kms_driver;
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+/* Test that /lib/firmware/radeon is a directory (or symlink to a
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+ * directory). We could try to match the udev search path, but let's
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+ * keep it simple.
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+ */
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+static bool radeon_firmware_installed(void)
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+{
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+#if IS_BUILTIN(CONFIG_DRM_RADEON)
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+ /* It may be too early to tell. Assume it's there. */
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+ return true;
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+#else
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+ struct path path;
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+
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+ if (kern_path("/lib/firmware/radeon", LOOKUP_DIRECTORY | LOOKUP_FOLLOW,
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+ &path) == 0) {
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+ path_put(&path);
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+ return true;
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+ }
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+
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+ return false;
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+#endif
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+}
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+
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static int radeon_pci_probe(struct pci_dev *pdev,
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const struct pci_device_id *ent)
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{
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@@ -295,6 +319,12 @@ static int radeon_pci_probe(struct pci_d
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if (vga_switcheroo_client_probe_defer(pdev))
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return -EPROBE_DEFER;
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+ if ((ent->driver_data & RADEON_FAMILY_MASK) >= CHIP_R600 &&
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+ !radeon_firmware_installed()) {
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+ DRM_ERROR("radeon kernel modesetting for R600 or later requires firmware installed\n");
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+ return -ENODEV;
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+ }
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+
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/* Get rid of things like offb */
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ret = drm_aperture_remove_conflicting_pci_framebuffers(pdev, &kms_driver);
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if (ret)
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