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| author | Thomas Zimmermann <tzimmermann@suse.de> | 2024-02-12 10:06:10 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2024-08-11 12:47:15 +0200 |
| commit | f5dce77f3f7dc7eac3907f40121f2575ea078711 (patch) | |
| tree | f6e55a432e97c612e419b6a67afed04ab34b5bc7 /drivers/video | |
| parent | 5b4d995dfdd0d5823c302b43c9d78750889d69ce (diff) | |
| download | linux-f5dce77f3f7dc7eac3907f40121f2575ea078711.tar.gz linux-f5dce77f3f7dc7eac3907f40121f2575ea078711.tar.bz2 linux-f5dce77f3f7dc7eac3907f40121f2575ea078711.zip | |
video: Provide screen_info_get_pci_dev() to find screen_info's PCI device
[ Upstream commit 036105e3a776b6fc2fe0d262896a23ff2cc2e6b1 ]
Add screen_info_get_pci_dev() to find the PCI device of an instance
of screen_info. Does nothing on systems without PCI bus.
v3:
* search PCI device with pci_get_base_class() (Sui)
v2:
* remove ret from screen_info_pci_dev() (Javier)
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240212090736.11464-3-tzimmermann@suse.de
Stable-dep-of: c2bc958b2b03 ("fbdev: vesafb: Detect VGA compatibility from screen info's VESA attributes")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/Makefile | 1 | ||||
| -rw-r--r-- | drivers/video/screen_info_pci.c | 48 |
2 files changed, 49 insertions, 0 deletions
diff --git a/drivers/video/Makefile b/drivers/video/Makefile index b929b664d52c..6bbf87c1b579 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -9,6 +9,7 @@ obj-$(CONFIG_VIDEO_NOMODESET) += nomodeset.o obj-$(CONFIG_HDMI) += hdmi.o screen_info-y := screen_info_generic.o +screen_info-$(CONFIG_PCI) += screen_info_pci.o obj-$(CONFIG_VT) += console/ obj-$(CONFIG_FB_STI) += console/ diff --git a/drivers/video/screen_info_pci.c b/drivers/video/screen_info_pci.c new file mode 100644 index 000000000000..d8985a54ce71 --- /dev/null +++ b/drivers/video/screen_info_pci.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include <linux/pci.h> +#include <linux/screen_info.h> + +static struct pci_dev *__screen_info_pci_dev(struct resource *res) +{ + struct pci_dev *pdev = NULL; + const struct resource *r = NULL; + + if (!(res->flags & IORESOURCE_MEM)) + return NULL; + + while (!r && (pdev = pci_get_base_class(PCI_BASE_CLASS_DISPLAY, pdev))) { + r = pci_find_resource(pdev, res); + } + + return pdev; +} + +/** + * screen_info_pci_dev() - Return PCI parent device that contains screen_info's framebuffer + * @si: the screen_info + * + * Returns: + * The screen_info's parent device or NULL on success, or a pointer-encoded + * errno value otherwise. The value NULL is not an error. It signals that no + * PCI device has been found. + */ +struct pci_dev *screen_info_pci_dev(const struct screen_info *si) +{ + struct resource res[SCREEN_INFO_MAX_RESOURCES]; + ssize_t i, numres; + + numres = screen_info_resources(si, res, ARRAY_SIZE(res)); + if (numres < 0) + return ERR_PTR(numres); + + for (i = 0; i < numres; ++i) { + struct pci_dev *pdev = __screen_info_pci_dev(&res[i]); + + if (pdev) + return pdev; + } + + return NULL; +} +EXPORT_SYMBOL(screen_info_pci_dev); |