Re: [PATCH v3] fbdev: sstfb: Make CONFIG_FB_DEVICE optional and update Kconfig dependency

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Hi Ganzalo,

Thanks for your updated patch.
Somehow empty lines sneaked in again, see the last line of your patch.
Anyway, I manually fixed up your initial patch with the fixes from
Thomas, so we should be fine now. No need to send a v4...

Thanks!
Helge

On 10/15/24 10:04, Gonzalo Silvalde Blanco wrote:
The sstfb driver currently depends on CONFIG_FB_DEVICE to create sysfs
entries and access info->dev. This patch wraps the relevant code blocks
with #ifdef CONFIG_FB_DEVICE, allowing the driver to be built and used
even if CONFIG_FB_DEVICE is not selected.

Additionally, the dependency on CONFIG_FB_DEVICE in the Kconfig file
has been removed for the FB_VOODOO1 driver, allowing it to be selected
independently of the FB_DEVICE option. This is because the sysfs setting
only controls the VGA pass-through state and is not required for the
display to function properly.

For more information on VGA pass-through, see:
http://vogonswiki.com/index.php/VGA_passthrough_cable

Tested by building with and without CONFIG_FB_DEVICE enabled, and both
configurations compiled successfully without issues.

Signed-off-by: Gonzalo Silvalde Blanco <gonzalo.silvalde@xxxxxxxxx>
---
  drivers/video/fbdev/Kconfig |  1 -
  drivers/video/fbdev/sstfb.c | 13 ++++++++-----
  2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig
index ea36c6956bf3..44a8fdbab6df 100644
--- a/drivers/video/fbdev/Kconfig
+++ b/drivers/video/fbdev/Kconfig
@@ -1236,7 +1236,6 @@ config FB_3DFX_I2C
  config FB_VOODOO1
  	tristate "3Dfx Voodoo Graphics (sst1) support"
  	depends on FB && PCI
-	depends on FB_DEVICE
  	select FB_IOMEM_HELPERS
  	help
  	  Say Y here if you have a 3Dfx Voodoo Graphics (Voodoo1/sst1) or
diff --git a/drivers/video/fbdev/sstfb.c b/drivers/video/fbdev/sstfb.c
index f8ae54ca0cc3..1d6ef97f1a84 100644
--- a/drivers/video/fbdev/sstfb.c
+++ b/drivers/video/fbdev/sstfb.c
@@ -716,6 +716,7 @@ static void sstfb_setvgapass( struct fb_info *info, int enable )
  	pci_write_config_dword(sst_dev, PCI_INIT_ENABLE, tmp);
  }

+#ifdef CONFIG_FB_DEVICE
  static ssize_t store_vgapass(struct device *device, struct device_attribute *attr,
  			const char *buf, size_t count)
  {
@@ -736,10 +737,10 @@ static ssize_t show_vgapass(struct device *device, struct device_attribute *attr
  	struct sstfb_par *par = info->par;
  	return sprintf(buf, "%d\n", par->vgapass);
  }
-
  static struct device_attribute device_attrs[] = {
  	__ATTR(vgapass, S_IRUGO|S_IWUSR, show_vgapass, store_vgapass)
-	};
+};
+#endif

  static int sstfb_ioctl(struct fb_info *info, unsigned int cmd,
  			unsigned long arg)
@@ -1435,10 +1436,10 @@ static int sstfb_probe(struct pci_dev *pdev, const struct pci_device_id *id)
  	}

  	sstfb_clear_screen(info);
-
+#ifdef CONFIG_FB_DEVICE
  	if (device_create_file(info->dev, &device_attrs[0]))
  		printk(KERN_WARNING "sstfb: can't create sysfs entry.\n");
-
+#endif

  	fb_info(info, "%s frame buffer device at 0x%p\n",
  		fix->id, info->screen_base);
@@ -1467,8 +1468,9 @@ static void sstfb_remove(struct pci_dev *pdev)

  	info = pci_get_drvdata(pdev);
  	par = info->par;
-
+#ifdef CONFIG_FB_DEVICE
  	device_remove_file(info->dev, &device_attrs[0]);
+#endif
  	sst_shutdown(info);
  	iounmap(info->screen_base);
  	iounmap(par->mmio_vbase);
@@ -1536,3 +1538,4 @@ MODULE_PARM_DESC(slowpci, "Uses slow PCI settings (0 or 1) (default=0)");
  module_param(mode_option, charp, 0);
  MODULE_PARM_DESC(mode_option, "Initial video mode (default=" DEFAULT_VIDEO_MODE ")");

+





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