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drm/mgag200: Add dedicated variables for blanking fields

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Represent fields for horizontal and vertical blanking with <hblkstr>,
<hblkend>, <vblkstr> and <vblkend>. Aligns the code with the Matrox
programming manuals.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718104551.575912-5-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-07-18 12:44:14 +02:00
parent e8f834b559
commit d6460bd52c
1 changed files with 16 additions and 13 deletions
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29
drivers/gpu/drm/mgag200/mgag200_mode.c
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@ -204,23 +204,26 @@ void mgag200_init_registers(struct mga_device *mdev)
void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mode *mode,
bool set_vidrst)
{
unsigned int hdispend, hsyncstr, hsyncend, htotal;
unsigned int vdispend, vsyncstr, vsyncend, vtotal;
unsigned int hdispend, hsyncstr, hsyncend, htotal, hblkstr, hblkend;
unsigned int vdispend, vsyncstr, vsyncend, vtotal, vblkstr, vblkend;
u8 misc, crtcext1, crtcext2, crtcext5;
hdispend = mode->crtc_hdisplay / 8 - 1;
hsyncstr = mode->crtc_hsync_start / 8 - 1;
hsyncend = mode->crtc_hsync_end / 8 - 1;
htotal = mode->crtc_htotal / 8 - 1;
/* Work around hardware quirk */
if ((htotal & 0x07) == 0x06 || (htotal & 0x07) == 0x04)
htotal++;
hblkstr = mode->crtc_hblank_start / 8 - 1;
hblkend = htotal;
vdispend = mode->crtc_vdisplay - 1;
vsyncstr = mode->crtc_vsync_start - 1;
vsyncend = mode->crtc_vsync_end - 1;
vtotal = mode->crtc_vtotal - 2;
vblkstr = mode->crtc_vblank_start;
vblkend = vtotal + 1;
misc = RREG8(MGA_MISC_IN);
@ -235,43 +238,43 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
misc &= ~MGAREG_MISC_VSYNCPOL;
crtcext1 = (((htotal - 4) & 0x100) >> 8) |
((hdispend & 0x100) >> 7) |
((hblkstr & 0x100) >> 7) |
((hsyncstr & 0x100) >> 6) |
(htotal & 0x40);
(hblkend & 0x40);
if (set_vidrst)
crtcext1 |= MGAREG_CRTCEXT1_VRSTEN |
MGAREG_CRTCEXT1_HRSTEN;
crtcext2 = ((vtotal & 0xc00) >> 10) |
((vdispend & 0x400) >> 8) |
((vdispend & 0xc00) >> 7) |
((vblkstr & 0xc00) >> 7) |
((vsyncstr & 0xc00) >> 5) |
((vdispend & 0x400) >> 3);
crtcext5 = 0x00;
WREG_CRT(0x00, htotal - 4);
WREG_CRT(0x01, hdispend);
WREG_CRT(0x02, hdispend);
WREG_CRT(0x03, (htotal & 0x1f) | 0x80);
WREG_CRT(0x02, hblkstr);
WREG_CRT(0x03, (hblkend & 0x1f) | 0x80);
WREG_CRT(0x04, hsyncstr);
WREG_CRT(0x05, ((htotal & 0x20) << 2) | (hsyncend & 0x1f));
WREG_CRT(0x05, ((hblkend & 0x20) << 2) | (hsyncend & 0x1f));
WREG_CRT(0x06, vtotal & 0xff);
WREG_CRT(0x07, ((vtotal & 0x100) >> 8) |
((vdispend & 0x100) >> 7) |
((vsyncstr & 0x100) >> 6) |
((vdispend & 0x100) >> 5) |
((vblkstr & 0x100) >> 5) |
((vdispend & 0x100) >> 4) | /* linecomp */
((vtotal & 0x200) >> 4) |
((vdispend & 0x200) >> 3) |
((vsyncstr & 0x200) >> 2));
WREG_CRT(0x09, ((vdispend & 0x200) >> 4) |
WREG_CRT(0x09, ((vblkstr & 0x200) >> 4) |
((vdispend & 0x200) >> 3));
WREG_CRT(0x10, vsyncstr & 0xff);
WREG_CRT(0x11, (vsyncend & 0x0f) | 0x20);
WREG_CRT(0x12, vdispend & 0xff);
WREG_CRT(0x14, 0);
WREG_CRT(0x15, vdispend & 0xff);
WREG_CRT(0x16, (vtotal + 1) & 0xff);
WREG_CRT(0x15, vblkstr & 0xff);
WREG_CRT(0x16, vblkend & 0xff);
WREG_CRT(0x17, 0xc3);
WREG_CRT(0x18, vdispend & 0xff);