drm/nv40: Try to set up CRE_LCD even if it has unknown bits set.

They don't seem to do anything useful, and we really want to program
CRE_LCD if we aren't lucky enough to find the right CRTC binding
already set.
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nv04_dac.c

@@ -352,15 +352,9 @@ static void nv04_dac_prepare(struct drm_encoder *encoder)
 	helper->dpms(encoder, DRM_MODE_DPMS_OFF);
 
 	nv04_dfp_disable(dev, head);
-
-	/* Some NV4x have unknown values (0x3f, 0x50, 0x54, 0x6b, 0x79, 0x7f)
-	 * at LCD__INDEX which we don't alter
-	 */
-	if (!(crtcstate[head].CRTC[NV_CIO_CRE_LCD__INDEX] & 0x44))
-		crtcstate[head].CRTC[NV_CIO_CRE_LCD__INDEX] = 0;
+	crtcstate[head].CRTC[NV_CIO_CRE_LCD__INDEX] = 0;
 }
 
-
 static void nv04_dac_mode_set(struct drm_encoder *encoder,
 			      struct drm_display_mode *mode,
 			      struct drm_display_mode *adjusted_mode)

drivers/gpu/drm/nouveau/nv04_dfp.c

@@ -253,26 +253,21 @@ static void nv04_dfp_prepare(struct drm_encoder *encoder)
 
 	nv04_dfp_prepare_sel_clk(dev, nv_encoder, head);
 
-	/* Some NV4x have unknown values (0x3f, 0x50, 0x54, 0x6b, 0x79, 0x7f)
-	 * at LCD__INDEX which we don't alter
-	 */
-	if (!(*cr_lcd & 0x44)) {
-		*cr_lcd = 0x3;
-
-		if (nv_two_heads(dev)) {
-			if (nv_encoder->dcb->location == DCB_LOC_ON_CHIP)
-				*cr_lcd |= head ? 0x0 : 0x8;
-			else {
-				*cr_lcd |= (nv_encoder->dcb->or << 4) & 0x30;
-				if (nv_encoder->dcb->type == OUTPUT_LVDS)
-					*cr_lcd |= 0x30;
-				if ((*cr_lcd & 0x30) == (*cr_lcd_oth & 0x30)) {
-					/* avoid being connected to both crtcs */
-					*cr_lcd_oth &= ~0x30;
-					NVWriteVgaCrtc(dev, head ^ 1,
-						       NV_CIO_CRE_LCD__INDEX,
-						       *cr_lcd_oth);
-				}
+	*cr_lcd = 0x3;
+
+	if (nv_two_heads(dev)) {
+		if (nv_encoder->dcb->location == DCB_LOC_ON_CHIP)
+			*cr_lcd |= head ? 0x0 : 0x8;
+		else {
+			*cr_lcd |= (nv_encoder->dcb->or << 4) & 0x30;
+			if (nv_encoder->dcb->type == OUTPUT_LVDS)
+				*cr_lcd |= 0x30;
+			if ((*cr_lcd & 0x30) == (*cr_lcd_oth & 0x30)) {
+				/* avoid being connected to both crtcs */
+				*cr_lcd_oth &= ~0x30;
+				NVWriteVgaCrtc(dev, head ^ 1,
+					       NV_CIO_CRE_LCD__INDEX,
+					       *cr_lcd_oth);
 			}
 		}
 	}

drivers/gpu/drm/nouveau/nv17_tv.c

@@ -408,15 +408,10 @@ static void nv17_tv_prepare(struct drm_encoder *encoder)
 
 	}
 
-	/* Some NV4x have unknown values (0x3f, 0x50, 0x54, 0x6b, 0x79, 0x7f)
-	 * at LCD__INDEX which we don't alter
-	 */
-	if (!(*cr_lcd & 0x44)) {
-		if (tv_norm->kind == CTV_ENC_MODE)
-			*cr_lcd = 0x1 | (head ? 0x0 : 0x8);
-		else
-			*cr_lcd = 0;
-	}
+	if (tv_norm->kind == CTV_ENC_MODE)
+		*cr_lcd = 0x1 | (head ? 0x0 : 0x8);
+	else
+		*cr_lcd = 0;
 
 	/* Set the DACCLK register */
 	dacclk = (NVReadRAMDAC(dev, 0, dacclk_off) & ~0x30) | 0x1;