tdfxfb: code improvements
This patch improves source code mainly by killing redundant variable loads,
reducing number of variables, simplifying conditional branches, etc.
Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/tdfxfb.c b/drivers/video/tdfxfb.c
index c032f6f..7d0c50e 100644
--- a/drivers/video/tdfxfb.c
+++ b/drivers/video/tdfxfb.c
@@ -63,12 +63,9 @@
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
-#include <linux/delay.h>
-#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/init.h>
#include <linux/pci.h>
-#include <linux/nvram.h>
#include <asm/io.h>
#include <linux/timer.h>
#include <linux/spinlock.h>
@@ -159,26 +156,15 @@
* Hardware-specific funcions
* ------------------------------------------------------------------------- */
-#ifdef VGA_REG_IO
-static inline u8 vga_inb(struct tdfx_par *par, u32 reg)
-{
- return inb(reg);
-}
-
-static inline void vga_outb(struct tdfx_par *par, u32 reg, u8 val)
-{
- outb(val, reg);
-}
-#else
static inline u8 vga_inb(struct tdfx_par *par, u32 reg)
{
return inb(par->iobase + reg - 0x300);
}
+
static inline void vga_outb(struct tdfx_par *par, u32 reg, u8 val)
{
outb(val, par->iobase + reg - 0x300);
}
-#endif
static inline void gra_outb(struct tdfx_par *par, u32 idx, u8 val)
{
@@ -279,11 +265,11 @@
banshee_make_room(par, 1);
tdfx_outl(par, COMMAND_3D, COMMAND_3D_NOP);
- while (1) {
- i = (tdfx_inl(par, STATUS) & STATUS_BUSY) ? 0 : i + 1;
- if (i == 3)
- break;
- }
+ do {
+ if ((tdfx_inl(par, STATUS) & STATUS_BUSY) == 0)
+ i++;
+ } while (i < 3);
+
return 0;
}
@@ -313,16 +299,17 @@
* Estimate value of n that produces target frequency
* with current m and k
*/
- int n_estimated = (freq * (m + 2) * (1 << k) / fref) - 2;
+ int n_estimated = ((freq * (m + 2) << k) / fref) - 2;
/* Search neighborhood of estimated n */
- for (n = max(0, n_estimated - 1);
- n <= min(255, n_estimated + 1); n++) {
+ for (n = max(0, n_estimated);
+ n <= min(255, n_estimated + 1);
+ n++) {
/*
* Calculate PLL freqency with current m, k and
* estimated n
*/
- int f = fref * (n + 2) / (m + 2) / (1 << k);
+ int f = (fref * (n + 2) / (m + 2)) >> k;
int error = abs(f - freq);
/*
@@ -342,7 +329,7 @@
n = best_n;
m = best_m;
k = best_k;
- *freq_out = fref * (n + 2) / (m + 2) / (1 << k);
+ *freq_out = (fref * (n + 2) / (m + 2)) >> k;
return (n << 8) | (m << 2) | k;
}
@@ -387,7 +374,7 @@
vga_enable_palette(par);
vga_enable_video(par);
- banshee_make_room(par, 11);
+ banshee_make_room(par, 9);
tdfx_outl(par, VGAINIT0, reg->vgainit0);
tdfx_outl(par, DACMODE, reg->dacmode);
tdfx_outl(par, VIDDESKSTRIDE, reg->stride);
@@ -400,8 +387,8 @@
tdfx_outl(par, MISCINIT0, reg->miscinit0);
banshee_make_room(par, 8);
- tdfx_outl(par, SRCBASE, reg->srcbase);
- tdfx_outl(par, DSTBASE, reg->dstbase);
+ tdfx_outl(par, SRCBASE, reg->startaddr);
+ tdfx_outl(par, DSTBASE, reg->startaddr);
tdfx_outl(par, COMMANDEXTRA_2D, 0);
tdfx_outl(par, CLIP0MIN, 0);
tdfx_outl(par, CLIP0MAX, 0x0fff0fff);
@@ -414,32 +401,24 @@
static unsigned long do_lfb_size(struct tdfx_par *par, unsigned short dev_id)
{
- u32 draminit0;
- u32 draminit1;
+ u32 draminit0 = tdfx_inl(par, DRAMINIT0);
+ u32 draminit1 = tdfx_inl(par, DRAMINIT1);
u32 miscinit1;
-
- int num_chips;
+ int num_chips = (draminit0 & DRAMINIT0_SGRAM_NUM) ? 8 : 4;
int chip_size; /* in MB */
- u32 lfbsize;
- int has_sgram;
-
- draminit0 = tdfx_inl(par, DRAMINIT0);
- draminit1 = tdfx_inl(par, DRAMINIT1);
-
- num_chips = (draminit0 & DRAMINIT0_SGRAM_NUM) ? 8 : 4;
+ int has_sgram = draminit1 & DRAMINIT1_MEM_SDRAM;
if (dev_id < PCI_DEVICE_ID_3DFX_VOODOO5) {
/* Banshee/Voodoo3 */
- has_sgram = draminit1 & DRAMINIT1_MEM_SDRAM;
chip_size = 2;
- if (has_sgram)
- chip_size = (draminit0 & DRAMINIT0_SGRAM_TYPE) ? 2 : 1;
+ if (has_sgram && (draminit0 & DRAMINIT0_SGRAM_TYPE))
+ chip_size = 1;
} else {
/* Voodoo4/5 */
has_sgram = 0;
- chip_size = 1 << ((draminit0 & DRAMINIT0_SGRAM_TYPE_MASK) >> DRAMINIT0_SGRAM_TYPE_SHIFT);
+ chip_size = draminit0 & DRAMINIT0_SGRAM_TYPE_MASK;
+ chip_size = 1 << (chip_size >> DRAMINIT0_SGRAM_TYPE_SHIFT);
}
- lfbsize = num_chips * chip_size * 1024 * 1024;
/* disable block writes for SDRAM */
miscinit1 = tdfx_inl(par, MISCINIT1);
@@ -448,7 +427,7 @@
banshee_make_room(par, 1);
tdfx_outl(par, MISCINIT1, miscinit1);
- return lfbsize;
+ return num_chips * chip_size * 1024l * 1024;
}
/* ------------------------------------------------------------------------- */
@@ -548,17 +527,18 @@
static int tdfxfb_set_par(struct fb_info *info)
{
struct tdfx_par *par = info->par;
- u32 hdispend, hsyncsta, hsyncend, htotal;
+ u32 hdispend = info->var.xres;
+ u32 hsyncsta = hdispend + info->var.right_margin;
+ u32 hsyncend = hsyncsta + info->var.hsync_len;
+ u32 htotal = hsyncend + info->var.left_margin;
u32 hd, hs, he, ht, hbs, hbe;
u32 vd, vs, ve, vt, vbs, vbe;
struct banshee_reg reg;
int fout, freq;
- u32 wd, cpp;
-
- par->baseline = 0;
+ u32 wd;
+ u32 cpp = (info->var.bits_per_pixel + 7) >> 3;
memset(®, 0, sizeof(reg));
- cpp = (info->var.bits_per_pixel + 7) / 8;
reg.vidcfg = VIDCFG_VIDPROC_ENABLE | VIDCFG_DESK_ENABLE |
VIDCFG_CURS_X11 |
@@ -568,14 +548,8 @@
/* PLL settings */
freq = PICOS2KHZ(info->var.pixclock);
- reg.dacmode = 0;
reg.vidcfg &= ~VIDCFG_2X;
- hdispend = info->var.xres;
- hsyncsta = hdispend + info->var.right_margin;
- hsyncend = hsyncsta + info->var.hsync_len;
- htotal = hsyncend + info->var.left_margin;
-
if (freq > par->max_pixclock / 2) {
freq = freq > par->max_pixclock ? par->max_pixclock : freq;
reg.dacmode |= DACMODE_2X;
@@ -598,11 +572,16 @@
vs = vd + (info->var.lower_margin << 1);
ve = vs + (info->var.vsync_len << 1);
vbe = vt = ve + (info->var.upper_margin << 1) - 1;
+ reg.screensize = info->var.xres | (info->var.yres << 13);
+ reg.vidcfg |= VIDCFG_HALF_MODE;
+ reg.crt[0x09] = 0x80;
} else {
vbs = vd = info->var.yres - 1;
vs = vd + info->var.lower_margin;
ve = vs + info->var.vsync_len;
vbe = vt = ve + info->var.upper_margin - 1;
+ reg.screensize = info->var.xres | (info->var.yres << 12);
+ reg.vidcfg &= ~VIDCFG_HALF_MODE;
}
/* this is all pretty standard VGA register stuffing */
@@ -611,11 +590,6 @@
info->var.xres < 480 ? 0x60 :
info->var.xres < 768 ? 0xe0 : 0x20);
- reg.gra[0x00] = 0x00;
- reg.gra[0x01] = 0x00;
- reg.gra[0x02] = 0x00;
- reg.gra[0x03] = 0x00;
- reg.gra[0x04] = 0x00;
reg.gra[0x05] = 0x40;
reg.gra[0x06] = 0x05;
reg.gra[0x07] = 0x0f;
@@ -638,10 +612,7 @@
reg.att[0x0e] = 0x0e;
reg.att[0x0f] = 0x0f;
reg.att[0x10] = 0x41;
- reg.att[0x11] = 0x00;
reg.att[0x12] = 0x0f;
- reg.att[0x13] = 0x00;
- reg.att[0x14] = 0x00;
reg.seq[0x00] = 0x03;
reg.seq[0x01] = 0x01; /* fixme: clkdiv2? */
@@ -663,19 +634,11 @@
((vs & 0x100) >> 6) |
((vd & 0x100) >> 7) |
((vt & 0x100) >> 8);
- reg.crt[0x08] = 0x00;
- reg.crt[0x09] = 0x40 | ((vbs & 0x200) >> 4);
- reg.crt[0x0a] = 0x00;
- reg.crt[0x0b] = 0x00;
- reg.crt[0x0c] = 0x00;
- reg.crt[0x0d] = 0x00;
- reg.crt[0x0e] = 0x00;
- reg.crt[0x0f] = 0x00;
+ reg.crt[0x09] |= 0x40 | ((vbs & 0x200) >> 4);
reg.crt[0x10] = vs;
reg.crt[0x11] = (ve & 0x0f) | 0x20;
reg.crt[0x12] = vd;
reg.crt[0x13] = wd;
- reg.crt[0x14] = 0x00;
reg.crt[0x15] = vbs;
reg.crt[0x16] = vbe + 1;
reg.crt[0x17] = 0xc3;
@@ -706,34 +669,15 @@
reg.cursc1 = 0xffffff;
reg.stride = info->var.xres * cpp;
- reg.startaddr = par->baseline * reg.stride;
- reg.srcbase = reg.startaddr;
- reg.dstbase = reg.startaddr;
+ reg.startaddr = info->var.yoffset * reg.stride
+ + info->var.xoffset * cpp;
- /* PLL settings */
- freq = PICOS2KHZ(info->var.pixclock);
-
- reg.dacmode &= ~DACMODE_2X;
- reg.vidcfg &= ~VIDCFG_2X;
- if (freq > par->max_pixclock / 2) {
- freq = freq > par->max_pixclock ? par->max_pixclock : freq;
- reg.dacmode |= DACMODE_2X;
- reg.vidcfg |= VIDCFG_2X;
- }
reg.vidpll = do_calc_pll(freq, &fout);
#if 0
reg.mempll = do_calc_pll(..., &fout);
reg.gfxpll = do_calc_pll(..., &fout);
#endif
- if ((info->var.vmode & FB_VMODE_MASK) == FB_VMODE_DOUBLE) {
- reg.screensize = info->var.xres | (info->var.yres << 13);
- reg.vidcfg |= VIDCFG_HALF_MODE;
- reg.crt[0x09] |= 0x80;
- } else {
- reg.screensize = info->var.xres | (info->var.yres << 12);
- reg.vidcfg &= ~VIDCFG_HALF_MODE;
- }
if ((info->var.vmode & FB_VMODE_MASK) == FB_VMODE_INTERLACED)
reg.vidcfg |= VIDCFG_INTERLACE;
reg.miscinit0 = tdfx_inl(par, MISCINIT0);
@@ -758,8 +702,7 @@
do_write_regs(info, ®);
/* Now change fb_fix_screeninfo according to changes in par */
- info->fix.line_length =
- info->var.xres * ((info->var.bits_per_pixel + 7) >> 3);
+ info->fix.line_length = reg.stride;
info->fix.visual = (info->var.bits_per_pixel == 8)
? FB_VISUAL_PSEUDOCOLOR
: FB_VISUAL_TRUECOLOR;
@@ -821,35 +764,28 @@
static int tdfxfb_blank(int blank, struct fb_info *info)
{
struct tdfx_par *par = info->par;
- u32 dacmode, state = 0, vgablank = 0;
+ int vgablank = 1;
+ u32 dacmode = tdfx_inl(par, DACMODE);
- dacmode = tdfx_inl(par, DACMODE);
+ dacmode &= ~(BIT(1) | BIT(3));
switch (blank) {
case FB_BLANK_UNBLANK: /* Screen: On; HSync: On, VSync: On */
- state = 0;
vgablank = 0;
break;
case FB_BLANK_NORMAL: /* Screen: Off; HSync: On, VSync: On */
- state = 0;
- vgablank = 1;
break;
case FB_BLANK_VSYNC_SUSPEND: /* Screen: Off; HSync: On, VSync: Off */
- state = BIT(3);
- vgablank = 1;
+ dacmode |= BIT(3);
break;
case FB_BLANK_HSYNC_SUSPEND: /* Screen: Off; HSync: Off, VSync: On */
- state = BIT(1);
- vgablank = 1;
+ dacmode |= BIT(1);
break;
case FB_BLANK_POWERDOWN: /* Screen: Off; HSync: Off, VSync: Off */
- state = BIT(1) | BIT(3);
- vgablank = 1;
+ dacmode |= BIT(1) | BIT(3);
break;
}
- dacmode &= ~(BIT(1) | BIT(3));
- dacmode |= state;
banshee_make_room(par, 1);
tdfx_outl(par, DACMODE, dacmode);
if (vgablank)
@@ -866,14 +802,13 @@
struct fb_info *info)
{
struct tdfx_par *par = info->par;
- u32 addr;
+ u32 addr = var->yoffset * info->fix.line_length;
if (nopan || var->xoffset || (var->yoffset > var->yres_virtual))
return -EINVAL;
if ((var->yoffset + var->yres > var->yres_virtual && nowrap))
return -EINVAL;
- addr = var->yoffset * info->fix.line_length;
banshee_make_room(par, 1);
tdfx_outl(par, VIDDESKSTART, addr);
@@ -962,7 +897,6 @@
dx = 0;
}
-
if (area->sx <= area->dx) {
//-X
blitcmd |= BIT(14);
@@ -1061,8 +995,7 @@
/* Send the leftovers now */
banshee_make_room(par, 3);
- i = size % 4;
- switch (i) {
+ switch (size % 4) {
case 0:
break;
case 1: