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viafb: improve misc register handling 

viafb: improve misc register handling

This patch improves the misc register handling by adding a modify
function for this to via_io.h and moving expanded definitions of the
relevant ports there. The code was changed to use those to improve
readability.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
This commit is contained in:
Florian Tobias Schandinat 2010-04-17 19:44:55 +00:00 committed by Jonathan Corbet
parent 384c3041ae
commit 162fc8c0c0
3 changed files with 17 additions and 21 deletions
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27
drivers/video/via/hw.c
View File

@ -1394,8 +1394,6 @@ u32 viafb_get_clk_value(int clk)
/* Set VCLK*/
void viafb_set_vclock(u32 CLK, int set_iga)
{
unsigned char RegTemp;
/* H.W. Reset : ON */
viafb_write_reg_mask(CR17, VIACR, 0x00, BIT7);
@ -1468,8 +1466,7 @@ void viafb_set_vclock(u32 CLK, int set_iga)
}
/* Fire! */
RegTemp = inb(VIARMisc);
outb(RegTemp | (BIT2 + BIT3), VIAWMisc);
via_write_misc_reg_mask(0x0C, 0x0C); /* select external clock */
}
void viafb_load_crtc_timing(struct display_timing device_timing,
@ -1713,6 +1710,7 @@ void viafb_fill_crtc_timing(struct crt_mode_table *crt_table,
int index = 0;
int h_addr, v_addr;
u32 pll_D_N;
u8 polarity = 0;
for (i = 0; i < video_mode->mode_array; i++) {
index = i;
@ -1741,20 +1739,11 @@ void viafb_fill_crtc_timing(struct crt_mode_table *crt_table,
v_addr = crt_reg.ver_addr;
/* update polarity for CRT timing */
if (crt_table[index].h_sync_polarity == NEGATIVE) {
if (crt_table[index].v_sync_polarity == NEGATIVE)
outb((inb(VIARMisc) & (~(BIT6 + BIT7))) |
(BIT6 + BIT7), VIAWMisc);
else
outb((inb(VIARMisc) & (~(BIT6 + BIT7))) | (BIT6),
VIAWMisc);
} else {
if (crt_table[index].v_sync_polarity == NEGATIVE)
outb((inb(VIARMisc) & (~(BIT6 + BIT7))) | (BIT7),
VIAWMisc);
else
outb((inb(VIARMisc) & (~(BIT6 + BIT7))), VIAWMisc);
}
if (crt_table[index].h_sync_polarity == NEGATIVE)
polarity |= BIT6;
if (crt_table[index].v_sync_polarity == NEGATIVE)
polarity |= BIT7;
via_write_misc_reg_mask(polarity, BIT6 | BIT7);
if (set_iga == IGA1) {
viafb_unlock_crt();
@ -2123,7 +2112,7 @@ int viafb_setmode(struct VideoModeTable *vmode_tbl, int video_bpp,
/* Fill VPIT Parameters */
/* Write Misc Register */
outb(VPIT.Misc, VIAWMisc);
outb(VPIT.Misc, VIA_MISC_REG_WRITE);
/* Write Sequencer */
for (i = 1; i <= StdSR; i++)

2
drivers/video/via/share.h
View File

@ -45,8 +45,6 @@
/* standard VGA IO port
*/
#define VIARMisc 0x3CC
#define VIAWMisc 0x3C2
#define VIAStatus 0x3DA
#define VIACR 0x3D4
#define VIASR 0x3C4

9
drivers/video/via/via_io.h
View File

@ -29,6 +29,9 @@
#include <linux/types.h>
#include <linux/io.h>
#define VIA_MISC_REG_READ 0x03CC
#define VIA_MISC_REG_WRITE 0x03C2
/*
* Indexed port operations. Note that these are all multi-op
* functions; every invocation will be racy if you're not holding
@ -55,4 +58,10 @@ static inline void via_write_reg_mask(u16 port, u8 index, u8 data, u8 mask)
outb((data & mask) | (old & ~mask), port + 1);
}
static inline void via_write_misc_reg_mask(u8 data, u8 mask)
{
u8 old = inb(VIA_MISC_REG_READ);
outb((data & mask) | (old & ~mask), VIA_MISC_REG_WRITE);
}
#endif /* __VIA_IO_H__ */