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drm/mgag200: Add dedicted variable for <linecomp> field

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Replace the line-compare value of <vdispend> with a dedicated variable
<linecomp>. Improves readability and prepares for vblank support.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240718104551.575912-6-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2024-07-18 12:44:15 +02:00
parent d6460bd52c
commit 5cd522b533
1 changed files with 7 additions and 4 deletions
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11
drivers/gpu/drm/mgag200/mgag200_mode.c
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@ -206,6 +206,7 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
{
unsigned int hdispend, hsyncstr, hsyncend, htotal, hblkstr, hblkend;
unsigned int vdispend, vsyncstr, vsyncend, vtotal, vblkstr, vblkend;
unsigned int linecomp;
u8 misc, crtcext1, crtcext2, crtcext5;
hdispend = mode->crtc_hdisplay / 8 - 1;
@ -225,6 +226,8 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
vblkstr = mode->crtc_vblank_start;
vblkend = vtotal + 1;
linecomp = vdispend;
misc = RREG8(MGA_MISC_IN);
if (mode->flags & DRM_MODE_FLAG_NHSYNC)
@ -249,7 +252,7 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
((vdispend & 0x400) >> 8) |
((vblkstr & 0xc00) >> 7) |
((vsyncstr & 0xc00) >> 5) |
((vdispend & 0x400) >> 3);
((linecomp & 0x400) >> 3);
crtcext5 = 0x00;
WREG_CRT(0x00, htotal - 4);
@ -263,12 +266,12 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
((vdispend & 0x100) >> 7) |
((vsyncstr & 0x100) >> 6) |
((vblkstr & 0x100) >> 5) |
((vdispend & 0x100) >> 4) | /* linecomp */
((linecomp & 0x100) >> 4) |
((vtotal & 0x200) >> 4) |
((vdispend & 0x200) >> 3) |
((vsyncstr & 0x200) >> 2));
WREG_CRT(0x09, ((vblkstr & 0x200) >> 4) |
((vdispend & 0x200) >> 3));
((linecomp & 0x200) >> 3));
WREG_CRT(0x10, vsyncstr & 0xff);
WREG_CRT(0x11, (vsyncend & 0x0f) | 0x20);
WREG_CRT(0x12, vdispend & 0xff);
@ -276,7 +279,7 @@ void mgag200_set_mode_regs(struct mga_device *mdev, const struct drm_display_mod
WREG_CRT(0x15, vblkstr & 0xff);
WREG_CRT(0x16, vblkend & 0xff);
WREG_CRT(0x17, 0xc3);
WREG_CRT(0x18, vdispend & 0xff);
WREG_CRT(0x18, linecomp & 0xff);
WREG_ECRT(0x01, crtcext1);
WREG_ECRT(0x02, crtcext2);