[PATCH 10/17] drm/mgag200: Set pitch in a separate helper function

[Thomas Zimmermann <tzimmermann@xxxxxxx>]

The framebuffer's pitch is now set in mgag200_set_offset().

Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
 drivers/gpu/drm/mgag200/mgag200_mode.c | 41 +++++++++++++++++---------
 1 file changed, 27 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 92dee31f16c42..eb83e471d72fc 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -1003,6 +1003,32 @@ static void mgag200_set_mode_regs(struct mga_device *mdev,
 	mga_crtc_set_plls(mdev, mode->clock);
 }
 
+static void mgag200_set_offset(struct mga_device *mdev,
+			       const struct drm_framebuffer *fb)
+{
+	unsigned int offset;
+	uint8_t crtc13, crtcext0;
+	u8 bppshift;
+
+	bppshift = mdev->bpp_shifts[fb->format->cpp[0] - 1];
+
+	offset = fb->pitches[0] / fb->format->cpp[0];
+	if (fb->format->cpp[0] * 8 == 24)
+		offset = (offset * 3) >> (4 - bppshift);
+	else
+		offset = offset >> (4 - bppshift);
+
+	RREG_ECRT(0, crtcext0);
+
+	crtc13 = offset & 0xff;
+
+	crtcext0 &= ~GENMASK(5, 4);
+	crtcext0 |= (offset & GENMASK(9, 8)) >> 4;
+
+	WREG_CRT(0x13, crtc13);
+	WREG_ECRT(0x00, crtcext0);
+}
+
 static int mga_crtc_mode_set(struct drm_crtc *crtc,
 				struct drm_display_mode *mode,
 				struct drm_display_mode *adjusted_mode,
@@ -1011,7 +1037,6 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 	struct drm_device *dev = crtc->dev;
 	struct mga_device *mdev = dev->dev_private;
 	const struct drm_framebuffer *fb = crtc->primary->fb;
-	int pitch;
 	int option = 0, option2 = 0;
 	int i;
 	unsigned char misc = 0;
@@ -1122,12 +1147,6 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 	WREG_SEQ(3, 0);
 	WREG_SEQ(4, 0xe);
 
-	pitch = fb->pitches[0] / fb->format->cpp[0];
-	if (fb->format->cpp[0] * 8 == 24)
-		pitch = (pitch * 3) >> (4 - bppshift);
-	else
-		pitch = pitch >> (4 - bppshift);
-
 	WREG_GFX(0, 0);
 	WREG_GFX(1, 0);
 	WREG_GFX(2, 0);
@@ -1144,20 +1163,15 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 	WREG_CRT(13, 0);
 	WREG_CRT(14, 0);
 	WREG_CRT(15, 0);
-	WREG_CRT(19, pitch & 0xFF);
-
-	ext_vga[0] = 0;
 
 	/* TODO interlace */
 
-	ext_vga[0] |= (pitch & 0x300) >> 4;
 	if (fb->format->cpp[0] * 8 == 24)
 		ext_vga[3] = (((1 << bppshift) * 3) - 1) | 0x80;
 	else
 		ext_vga[3] = ((1 << bppshift) - 1) | 0x80;
 	ext_vga[4] = 0;
 
-	WREG_ECRT(0, ext_vga[0]);
 	WREG_ECRT(3, ext_vga[3]);
 	WREG_ECRT(4, ext_vga[4]);
 
@@ -1171,8 +1185,6 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 		WREG_ECRT(6, 0);
 	}
 
-	WREG_ECRT(0, ext_vga[0]);
-
 	misc = RREG8(MGA_MISC_IN);
 	misc |= MGAREG_MISC_IOADSEL |
 		MGAREG_MISC_RAMMAPEN |
@@ -1180,6 +1192,7 @@ static int mga_crtc_mode_set(struct drm_crtc *crtc,
 	WREG8(MGA_MISC_OUT, misc);
 
 	mga_crtc_do_set_base(mdev, fb, old_fb);
+	mgag200_set_offset(mdev, fb);
 
 	mgag200_set_mode_regs(mdev, mode);
 
-- 
2.26.0

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