linux-kernel - Re: Kernel command line for a specific framebuffer console driver

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Date:	Fri, 12 Jan 2007 22:36:27 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Juergen Beisert <juergen127@...uzholzen.de>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kernel command line for a specific framebuffer console driver

On Fri, Jan 12, 2007 at 01:43:42PM +0100, Juergen Beisert wrote:
> does someone know how to forward a kernel command line option to configure the
> AMD Geode GX1 framebuffer?
>
> I tried with "video=gx1fb:1024x768-16@60" but it does not work. On another
> machine with an SIS framebuffer the line "video=sisfb:1280x1024-8@60" works
> as expected.
>
> Any ideas?

Yes. You try this patch and report whether it works or not.

--- a/drivers/video/geode/gx1fb_core.c
+++ b/drivers/video/geode/gx1fb_core.c
@@ -401,6 +401,30 @@ static void gx1fb_remove(struct pci_dev 
 	framebuffer_release(info);
 }
 
+#ifndef MODULE
+static void __init gx1fb_setup(char *options)
+{
+	char *this_opt;
+
+	if (!options || !*options)
+		return;
+
+	while ((this_opt = strsep(&options, ","))) {
+		if (!*this_opt)
+			continue;
+
+		if (!strncmp(this_opt, "mode:", 5))
+			strlcpy(mode_option, this_opt + 5, sizeof(mode_option));
+		else if (!strncmp(this_opt, "crt:", 4))
+			crt_option = !!simple_strtoul(this_opt + 4, NULL, 0);
+		else if (!strncmp(this_opt, "panel:", 6))
+			strlcpy(panel_option, this_opt + 6, sizeof(panel_option));
+		else
+			strlcpy(mode_option, this_opt, sizeof(mode_option));
+	}
+}
+#endif
+
 static struct pci_device_id gx1fb_id_table[] = {
 	{ PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_VIDEO,
 	  PCI_ANY_ID, PCI_ANY_ID, PCI_BASE_CLASS_DISPLAY << 16,
@@ -420,8 +444,11 @@ static struct pci_driver gx1fb_driver = 
 static int __init gx1fb_init(void)
 {
 #ifndef MODULE
-	if (fb_get_options("gx1fb", NULL))
+	char *option = NULL;
+
+	if (fb_get_options("gx1fb", &option))
 		return -ENODEV;
+	gx1fb_setup(option);
 #endif
 	return pci_register_driver(&gx1fb_driver);
 }

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