[PATCH 1/5] matroxfb: Make CONFIG_FB_MATROX_MULTIHEAD=y mandatory

From: Jean Delvare
Date: Sun Aug 30 2009 - 15:54:33 EST

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I would like to get rid of option CONFIG_FB_MATROX_MULTIHEAD and just
always enable it. There are many reasons for doing this:

* CONFIG_FB_MATROX_MULTIHEAD=y is what all x86 distributions do, so
it definitely works or we would know by now.

* Building the matroxfb driver with CONFIG_FB_MATROX_MULTIHEAD not set
results in the following build warning:

drivers/video/matrox/matroxfb_crtc2.c: In function 'matroxfb_dh_open':
drivers/video/matrox/matroxfb_crtc2.c:265: warning: the address of 'matroxfb_global_mxinfo' will always evaluate as 'true'
drivers/video/matrox/matroxfb_crtc2.c: In function 'matroxfb_dh_release':
drivers/video/matrox/matroxfb_crtc2.c:285: warning: the address of 'matroxfb_global_mxinfo' will always evaluate as 'true'

This is nothing to be worried about, the driver will work fine, but
build warnings are still annoying.

* The trick to get multihead support without
CONFIG_FB_MATROX_MULTIHEAD, which is described in the config help
text, no longer works: you can't load the same kernel module more than
once.

* I fail to see how CONFIG_FB_MATROX_MULTIHEAD=y would make the code
significantly slower, contrary to what the help text says. A few
extra parameters on the stack here and there can't really slow things
down in comaprison to the rest of the code, and register access.

* The driver built without CONFIG_FB_MATROX_MULTIHEAD is larger than
the driver build with CONFIG_FB_MATROX_MULTIHEAD=y by 8%.

* One less configuration option makes things simpler. We add options
all the time, being able to remove one for once is nice. It improves
testing coverage. And I don't think the Matrox adapters are still
popular enough to warrant overdetailed configuration settings.

* We should be able to unobfuscate the driver code quite a bit after
this change (patches follow.)

Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Acked-by: Petr Vandrovec <vandrove@xxxxxxxxxx>
---
Documentation/fb/matroxfb.txt | 4 +---
drivers/video/Kconfig | 20 --------------------
drivers/video/matrox/matroxfb_base.c | 23 -----------------------
drivers/video/matrox/matroxfb_base.h | 20 --------------------
drivers/video/matrox/matroxfb_misc.c | 4 ----
5 files changed, 1 insertion(+), 70 deletions(-)

--- linux-2.6.31-rc4.orig/drivers/video/matrox/matroxfb_base.c 2009-07-30 19:32:01.000000000 +0200
+++ linux-2.6.31-rc4/drivers/video/matrox/matroxfb_base.c 2009-08-01 14:14:07.000000000 +0200
@@ -379,9 +379,7 @@ static void matroxfb_remove(WPMINFO int
mga_iounmap(ACCESS_FBINFO(video.vbase));
release_mem_region(ACCESS_FBINFO(video.base), ACCESS_FBINFO(video.len_maximum));
release_mem_region(ACCESS_FBINFO(mmio.base), 16384);
-#ifdef CONFIG_FB_MATROX_MULTIHEAD
kfree(minfo);
-#endif
}

/*
@@ -644,9 +642,7 @@ static int matroxfb_setcolreg(unsigned r
unsigned blue, unsigned transp,
struct fb_info *fb_info)
{
-#ifdef CONFIG_FB_MATROX_MULTIHEAD
struct matrox_fb_info* minfo = container_of(fb_info, struct matrox_fb_info, fbcon);
-#endif

DBG(__func__)

@@ -2011,9 +2007,6 @@ static int matroxfb_probe(struct pci_dev
struct matrox_fb_info* minfo;
int err;
u_int32_t cmd;
-#ifndef CONFIG_FB_MATROX_MULTIHEAD
- static int registered = 0;
-#endif
DBG(__func__)

svid = pdev->subsystem_vendor;
@@ -2037,15 +2030,9 @@ static int matroxfb_probe(struct pci_dev
return -1;
}

-#ifdef CONFIG_FB_MATROX_MULTIHEAD
minfo = kmalloc(sizeof(*minfo), GFP_KERNEL);
if (!minfo)
return -1;
-#else
- if (registered) /* singlehead driver... */
- return -1;
- minfo = &matroxfb_global_mxinfo;
-#endif
memset(MINFO, 0, sizeof(*MINFO));

ACCESS_FBINFO(pcidev) = pdev;
@@ -2090,15 +2077,10 @@ static int matroxfb_probe(struct pci_dev

err = initMatrox2(PMINFO b);
if (!err) {
-#ifndef CONFIG_FB_MATROX_MULTIHEAD
- registered = 1;
-#endif
matroxfb_register_device(MINFO);
return 0;
}
-#ifdef CONFIG_FB_MATROX_MULTIHEAD
kfree(minfo);
-#endif
return -1;
}

@@ -2510,13 +2492,8 @@ module_param(inv24, int, 0);
MODULE_PARM_DESC(inv24, "Inverts clock polarity for 24bpp and loop frequency > 100MHz (default=do not invert polarity)");
module_param(inverse, int, 0);
MODULE_PARM_DESC(inverse, "Inverse (0 or 1) (default=0)");
-#ifdef CONFIG_FB_MATROX_MULTIHEAD
module_param(dev, int, 0);
MODULE_PARM_DESC(dev, "Multihead support, attach to device ID (0..N) (default=all working)");
-#else
-module_param(dev, int, 0);
-MODULE_PARM_DESC(dev, "Multihead support, attach to device ID (0..N) (default=first working)");
-#endif
module_param(vesa, int, 0);
MODULE_PARM_DESC(vesa, "Startup videomode (0x000-0x1FF) (default=0x101)");
module_param(xres, int, 0);
--- linux-2.6.31-rc4.orig/drivers/video/matrox/matroxfb_base.h 2009-07-30 19:32:01.000000000 +0200
+++ linux-2.6.31-rc4/drivers/video/matrox/matroxfb_base.h 2009-08-01 14:14:07.000000000 +0200
@@ -524,7 +524,6 @@ struct matrox_fb_info {

#define info2minfo(info) container_of(info, struct matrox_fb_info, fbcon)

-#ifdef CONFIG_FB_MATROX_MULTIHEAD
#define ACCESS_FBINFO2(info, x) (info->x)
#define ACCESS_FBINFO(x) ACCESS_FBINFO2(minfo,x)

@@ -538,25 +537,6 @@ struct matrox_fb_info {
#define PMINFO PMINFO2 ,

#define MINFO_FROM(x) struct matrox_fb_info* minfo = x
-#else
-
-extern struct matrox_fb_info matroxfb_global_mxinfo;
-
-#define ACCESS_FBINFO(x) (matroxfb_global_mxinfo.x)
-#define ACCESS_FBINFO2(info, x) (matroxfb_global_mxinfo.x)
-
-#define MINFO (&matroxfb_global_mxinfo)
-
-#define WPMINFO2 void
-#define WPMINFO
-#define CPMINFO2 void
-#define CPMINFO
-#define PMINFO2
-#define PMINFO
-
-#define MINFO_FROM(x)
-
-#endif

#define MINFO_FROM_INFO(x) MINFO_FROM(info2minfo(x))

--- linux-2.6.31-rc4.orig/drivers/video/matrox/matroxfb_misc.c 2009-07-30 19:32:01.000000000 +0200
+++ linux-2.6.31-rc4/drivers/video/matrox/matroxfb_misc.c 2009-08-01 14:14:07.000000000 +0200
@@ -784,10 +784,6 @@ EXPORT_SYMBOL(matroxfb_DAC_in);
EXPORT_SYMBOL(matroxfb_DAC_out);
EXPORT_SYMBOL(matroxfb_var2my);
EXPORT_SYMBOL(matroxfb_PLL_calcclock);
-#ifndef CONFIG_FB_MATROX_MULTIHEAD
-struct matrox_fb_info matroxfb_global_mxinfo;
-EXPORT_SYMBOL(matroxfb_global_mxinfo);
-#endif
EXPORT_SYMBOL(matroxfb_vgaHWinit); /* DAC1064, Ti3026 */
EXPORT_SYMBOL(matroxfb_vgaHWrestore); /* DAC1064, Ti3026 */
EXPORT_SYMBOL(matroxfb_read_pins);
--- linux-2.6.31-rc4.orig/drivers/video/Kconfig 2009-07-30 19:32:01.000000000 +0200
+++ linux-2.6.31-rc4/drivers/video/Kconfig 2009-07-31 18:49:05.000000000 +0200
@@ -1273,26 +1273,6 @@ config FB_MATROX_MAVEN
painting procedures (the secondary head does not use acceleration
engine).

-config FB_MATROX_MULTIHEAD
- bool "Multihead support"
- depends on FB_MATROX
- ---help---
- Say Y here if you have more than one (supported) Matrox device in
- your computer and you want to use all of them for different monitors
- ("multihead"). If you have only one device, you should say N because
- the driver compiled with Y is larger and a bit slower, especially on
- ia32 (ix86).
-
- If you said M to "Matrox unified accelerated driver" and N here, you
- will still be able to use several Matrox devices simultaneously:
- insert several instances of the module matroxfb into the kernel
- with insmod, supplying the parameter "dev=N" where N is 0, 1, etc.
- for the different Matrox devices. This method is slightly faster but
- uses 40 KB of kernel memory per Matrox card.
-
- There is no need for enabling 'Matrox multihead support' if you have
- only one Matrox card in the box.
-
config FB_RADEON
tristate "ATI Radeon display support"
depends on FB && PCI
--- linux-2.6.31-rc4.orig/Documentation/fb/matroxfb.txt 2009-06-10 05:05:27.000000000 +0200
+++ linux-2.6.31-rc4/Documentation/fb/matroxfb.txt 2009-08-01 14:14:49.000000000 +0200
@@ -186,9 +186,7 @@ noinverse - show true colors on screen.
dev:X - bind driver to device X. Driver numbers device from 0 up to N,
where device 0 is first `known' device found, 1 second and so on.
lspci lists devices in this order.
- Default is `every' known device for driver with multihead support
- and first working device (usually dev:0) for driver without
- multihead support.
+ Default is `every' known device.
nohwcursor - disables hardware cursor (use software cursor instead).
hwcursor - enables hardware cursor. It is default. If you are using
non-accelerated mode (`noaccel' or `fbset -accel false'), software

--
Jean Delvare
--
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Next message: Jean Delvare: "[PATCH 2/5] matroxfb: Get rid of unneeded macros ACCESS_FBINFO andMINFO"
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In reply to: Jean Delvare: "[PATCH 0/5] matroxfb: Code cleanups"
Next in thread: Jean Delvare: "[PATCH 2/5] matroxfb: Get rid of unneeded macros ACCESS_FBINFO andMINFO"
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