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A workaround for screen flicker; eliminate some I/O access to the VGA

Browse Source 
chip.

It has been observed that the problem is most apparent:

a) in notebook computers,
b) and/or in the systems with C&T video chips.

Define the new configuration option SC_BAD_FLICKER in the kernel
configuration file to remove outb()/outw() calls in question.
This commit is contained in:
yokota 1998-08-10 08:39:19 +00:00
parent adbadeedc1
commit ec2542bd97
2 changed files with 34 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
sys/dev/syscons/syscons.c
View File

@ -25,7 +25,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: syscons.c,v 1.271 1998/08/03 09:18:58 yokota Exp $
* $Id: syscons.c,v 1.272 1998/08/03 11:30:45 yokota Exp $
*/
#include "sc.h"
@ -4734,18 +4734,26 @@ set_font_mode(u_char *buf)
outb(ATC, 0x20); /* enable palette */
#if SLOW_VGA
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x01);
#endif
outb(TSIDX, 0x02); outb(TSREG, 0x04);
outb(TSIDX, 0x04); outb(TSREG, 0x07);
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x03);
#endif
outb(GDCIDX, 0x04); outb(GDCREG, 0x02);
outb(GDCIDX, 0x05); outb(GDCREG, 0x00);
outb(GDCIDX, 0x06); outb(GDCREG, 0x04);
#else
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0100);
#endif
outw(TSIDX, 0x0402);
outw(TSIDX, 0x0704);
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0300);
#endif
outw(GDCIDX, 0x0204);
outw(GDCIDX, 0x0005);
outw(GDCIDX, 0x0406); /* addr = a0000, 64kb */
@ -4766,10 +4774,14 @@ set_normal_mode(u_char *buf)
outb(ATC, 0x20); /* enable palette */
#if SLOW_VGA
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x01);
#endif
outb(TSIDX, 0x02); outb(TSREG, buf[0]);
outb(TSIDX, 0x04); outb(TSREG, buf[1]);
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x03);
#endif
outb(GDCIDX, 0x04); outb(GDCREG, buf[2]);
outb(GDCIDX, 0x05); outb(GDCREG, buf[3]);
if (crtc_addr == MONO_BASE) {
@ -4778,10 +4790,14 @@ set_normal_mode(u_char *buf)
outb(GDCIDX, 0x06); outb(GDCREG,(buf[4] & 0x03) | 0x0c);
}
#else
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0100);
#endif
outw(TSIDX, 0x0002 | (buf[0] << 8));
outw(TSIDX, 0x0004 | (buf[1] << 8));
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0300);
#endif
outw(GDCIDX, 0x0004 | (buf[2] << 8));
outw(GDCIDX, 0x0005 | (buf[3] << 8));
if (crtc_addr == MONO_BASE)

18
sys/i386/isa/syscons.c
View File

@ -25,7 +25,7 @@
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: syscons.c,v 1.271 1998/08/03 09:18:58 yokota Exp $
* $Id: syscons.c,v 1.272 1998/08/03 11:30:45 yokota Exp $
*/
#include "sc.h"
@ -4734,18 +4734,26 @@ set_font_mode(u_char *buf)
outb(ATC, 0x20); /* enable palette */
#if SLOW_VGA
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x01);
#endif
outb(TSIDX, 0x02); outb(TSREG, 0x04);
outb(TSIDX, 0x04); outb(TSREG, 0x07);
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x03);
#endif
outb(GDCIDX, 0x04); outb(GDCREG, 0x02);
outb(GDCIDX, 0x05); outb(GDCREG, 0x00);
outb(GDCIDX, 0x06); outb(GDCREG, 0x04);
#else
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0100);
#endif
outw(TSIDX, 0x0402);
outw(TSIDX, 0x0704);
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0300);
#endif
outw(GDCIDX, 0x0204);
outw(GDCIDX, 0x0005);
outw(GDCIDX, 0x0406); /* addr = a0000, 64kb */
@ -4766,10 +4774,14 @@ set_normal_mode(u_char *buf)
outb(ATC, 0x20); /* enable palette */
#if SLOW_VGA
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x01);
#endif
outb(TSIDX, 0x02); outb(TSREG, buf[0]);
outb(TSIDX, 0x04); outb(TSREG, buf[1]);
#ifndef SC_BAD_FLICKER
outb(TSIDX, 0x00); outb(TSREG, 0x03);
#endif
outb(GDCIDX, 0x04); outb(GDCREG, buf[2]);
outb(GDCIDX, 0x05); outb(GDCREG, buf[3]);
if (crtc_addr == MONO_BASE) {
@ -4778,10 +4790,14 @@ set_normal_mode(u_char *buf)
outb(GDCIDX, 0x06); outb(GDCREG,(buf[4] & 0x03) | 0x0c);
}
#else
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0100);
#endif
outw(TSIDX, 0x0002 | (buf[0] << 8));
outw(TSIDX, 0x0004 | (buf[1] << 8));
#ifndef SC_BAD_FLICKER
outw(TSIDX, 0x0300);
#endif
outw(GDCIDX, 0x0004 | (buf[2] << 8));
outw(GDCIDX, 0x0005 | (buf[3] << 8));
if (crtc_addr == MONO_BASE)