diff --git a/drivers/gpu/drm/mgag200/Makefile b/drivers/gpu/drm/mgag200/Makefile
index 89558549c3af..94d465a2b753 100644
--- a/drivers/gpu/drm/mgag200/Makefile
+++ b/drivers/gpu/drm/mgag200/Makefile
@@ -1,5 +1,6 @@
 # SPDX-License-Identifier: GPL-2.0-only
 mgag200-y := \
+	mgag200_bmc.o \
 	mgag200_drv.o \
 	mgag200_g200.o \
 	mgag200_g200eh.o \
diff --git a/drivers/gpu/drm/mgag200/mgag200_bmc.c b/drivers/gpu/drm/mgag200/mgag200_bmc.c
new file mode 100644
index 000000000000..2ba2e3c5086a
--- /dev/null
+++ b/drivers/gpu/drm/mgag200/mgag200_bmc.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0-only
+
+#include <linux/delay.h>
+
+#include "mgag200_drv.h"
+
+void mgag200_bmc_disable_vidrst(struct mga_device *mdev)
+{
+	u8 tmp;
+	int iter_max;
+
+	/*
+	 * 1 - The first step is to inform the BMC of an upcoming mode
+	 * change. We are putting the misc<0> to output.
+	 */
+
+	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
+	tmp = RREG8(DAC_DATA);
+	tmp |= 0x10;
+	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
+
+	/* we are putting a 1 on the misc<0> line */
+	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
+	tmp = RREG8(DAC_DATA);
+	tmp |= 0x10;
+	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
+
+	/*
+	 * 2- Second step to mask any further scan request. This is
+	 * done by asserting the remfreqmsk bit (XSPAREREG<7>)
+	 */
+
+	WREG8(DAC_INDEX, MGA1064_SPAREREG);
+	tmp = RREG8(DAC_DATA);
+	tmp |= 0x80;
+	WREG_DAC(MGA1064_SPAREREG, tmp);
+
+	/*
+	 * 3a- The third step is to verify if there is an active scan.
+	 * We are waiting for a 0 on remhsyncsts <XSPAREREG<0>).
+	 */
+	iter_max = 300;
+	while (!(tmp & 0x1) && iter_max) {
+		WREG8(DAC_INDEX, MGA1064_SPAREREG);
+		tmp = RREG8(DAC_DATA);
+		udelay(1000);
+		iter_max--;
+	}
+
+	/*
+	 * 3b- This step occurs only if the remove is actually
+	 * scanning. We are waiting for the end of the frame which is
+	 * a 1 on remvsyncsts (XSPAREREG<1>)
+	 */
+	if (iter_max) {
+		iter_max = 300;
+		while ((tmp & 0x2) && iter_max) {
+			WREG8(DAC_INDEX, MGA1064_SPAREREG);
+			tmp = RREG8(DAC_DATA);
+			udelay(1000);
+			iter_max--;
+		}
+	}
+}
+
+void mgag200_bmc_enable_vidrst(struct mga_device *mdev)
+{
+	u8 tmp;
+
+	/* Ensure that the vrsten and hrsten are set */
+	WREG8(MGAREG_CRTCEXT_INDEX, 1);
+	tmp = RREG8(MGAREG_CRTCEXT_DATA);
+	WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
+
+	/* Assert rstlvl2 */
+	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
+	tmp = RREG8(DAC_DATA);
+	tmp |= 0x8;
+	WREG8(DAC_DATA, tmp);
+
+	udelay(10);
+
+	/* Deassert rstlvl2 */
+	tmp &= ~0x08;
+	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
+	WREG8(DAC_DATA, tmp);
+
+	/* Remove mask of scan request */
+	WREG8(DAC_INDEX, MGA1064_SPAREREG);
+	tmp = RREG8(DAC_DATA);
+	tmp &= ~0x80;
+	WREG8(DAC_DATA, tmp);
+
+	/* Put back a 0 on the misc<0> line */
+	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
+	tmp = RREG8(DAC_DATA);
+	tmp &= ~0x10;
+	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
+}
diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.h b/drivers/gpu/drm/mgag200/mgag200_drv.h
index 68c0b72f7430..e8b338198fdb 100644
--- a/drivers/gpu/drm/mgag200/mgag200_drv.h
+++ b/drivers/gpu/drm/mgag200/mgag200_drv.h
@@ -236,6 +236,17 @@ struct mgag200_device_info {
 	}
 
 struct mgag200_device_funcs {
+	/*
+	 * Disables an external reset source (i.e., BMC) before programming
+	 * a new display mode.
+	 */
+	void (*disable_vidrst)(struct mga_device *mdev);
+
+	/*
+	 * Enables an external reset source (i.e., BMC) after programming
+	 * a new display mode.
+	 */
+	void (*enable_vidrst)(struct mga_device *mdev);
 };
 
 struct mga_device {
@@ -327,6 +338,10 @@ resource_size_t mgag200_device_probe_vram(struct mga_device *mdev);
 void mgag200_init_registers(struct mga_device *mdev);
 int mgag200_modeset_init(struct mga_device *mdev, resource_size_t vram_fb_available);
 
+				/* mgag200_bmc.c */
+void mgag200_bmc_disable_vidrst(struct mga_device *mdev);
+void mgag200_bmc_enable_vidrst(struct mga_device *mdev);
+
 				/* mgag200_i2c.c */
 int mgag200_i2c_init(struct mga_device *mdev, struct mga_i2c_chan *i2c);
 
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200ew3.c b/drivers/gpu/drm/mgag200/mgag200_g200ew3.c
index 202db00bb62e..19a870120ebc 100644
--- a/drivers/gpu/drm/mgag200/mgag200_g200ew3.c
+++ b/drivers/gpu/drm/mgag200/mgag200_g200ew3.c
@@ -21,6 +21,8 @@ static const struct mgag200_device_info mgag200_g200ew3_device_info =
 	MGAG200_DEVICE_INFO_INIT(2048, 2048, 0, true, 0, 1, false);
 
 static const struct mgag200_device_funcs mgag200_g200ew3_device_funcs = {
+	.disable_vidrst = mgag200_bmc_disable_vidrst,
+	.enable_vidrst = mgag200_bmc_enable_vidrst,
 };
 
 static resource_size_t mgag200_g200ew3_device_probe_vram(struct mga_device *mdev)
diff --git a/drivers/gpu/drm/mgag200/mgag200_g200wb.c b/drivers/gpu/drm/mgag200/mgag200_g200wb.c
index 3ca016b33e9a..92e174d63752 100644
--- a/drivers/gpu/drm/mgag200/mgag200_g200wb.c
+++ b/drivers/gpu/drm/mgag200/mgag200_g200wb.c
@@ -46,6 +46,8 @@ static const struct mgag200_device_info mgag200_g200wb_device_info =
 	MGAG200_DEVICE_INFO_INIT(1280, 1024, 31877, true, 0, 1, false);
 
 static const struct mgag200_device_funcs mgag200_g200wb_device_funcs = {
+	.disable_vidrst = mgag200_bmc_disable_vidrst,
+	.enable_vidrst = mgag200_bmc_enable_vidrst,
 };
 
 struct mga_device *mgag200_g200wb_device_create(struct pci_dev *pdev, const struct drm_driver *drv,
diff --git a/drivers/gpu/drm/mgag200/mgag200_mode.c b/drivers/gpu/drm/mgag200/mgag200_mode.c
index 789e02b8615f..7bcd3f6d891d 100644
--- a/drivers/gpu/drm/mgag200/mgag200_mode.c
+++ b/drivers/gpu/drm/mgag200/mgag200_mode.c
@@ -132,95 +132,6 @@ static inline void mga_wait_busy(struct mga_device *mdev)
 	} while ((status & 0x01) && time_before(jiffies, timeout));
 }
 
-static void mgag200_g200wb_hold_bmc(struct mga_device *mdev)
-{
-	u8 tmp;
-	int iter_max;
-
-	/* 1- The first step is to warn the BMC of an upcoming mode change.
-	 * We are putting the misc<0> to output.*/
-
-	WREG8(DAC_INDEX, MGA1064_GEN_IO_CTL);
-	tmp = RREG8(DAC_DATA);
-	tmp |= 0x10;
-	WREG_DAC(MGA1064_GEN_IO_CTL, tmp);
-
-	/* we are putting a 1 on the misc<0> line */
-	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
-	tmp = RREG8(DAC_DATA);
-	tmp |= 0x10;
-	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
-
-	/* 2- Second step to mask and further scan request
-	 * This will be done by asserting the remfreqmsk bit (XSPAREREG<7>)
-	 */
-	WREG8(DAC_INDEX, MGA1064_SPAREREG);
-	tmp = RREG8(DAC_DATA);
-	tmp |= 0x80;
-	WREG_DAC(MGA1064_SPAREREG, tmp);
-
-	/* 3a- the third step is to verifu if there is an active scan
-	 * We are searching for a 0 on remhsyncsts <XSPAREREG<0>)
-	 */
-	iter_max = 300;
-	while (!(tmp & 0x1) && iter_max) {
-		WREG8(DAC_INDEX, MGA1064_SPAREREG);
-		tmp = RREG8(DAC_DATA);
-		udelay(1000);
-		iter_max--;
-	}
-
-	/* 3b- this step occurs only if the remove is actually scanning
-	 * we are waiting for the end of the frame which is a 1 on
-	 * remvsyncsts (XSPAREREG<1>)
-	 */
-	if (iter_max) {
-		iter_max = 300;
-		while ((tmp & 0x2) && iter_max) {
-			WREG8(DAC_INDEX, MGA1064_SPAREREG);
-			tmp = RREG8(DAC_DATA);
-			udelay(1000);
-			iter_max--;
-		}
-	}
-}
-
-static void mgag200_g200wb_release_bmc(struct mga_device *mdev)
-{
-	u8 tmp;
-
-	/* 1- The first step is to ensure that the vrsten and hrsten are set */
-	WREG8(MGAREG_CRTCEXT_INDEX, 1);
-	tmp = RREG8(MGAREG_CRTCEXT_DATA);
-	WREG8(MGAREG_CRTCEXT_DATA, tmp | 0x88);
-
-	/* 2- second step is to assert the rstlvl2 */
-	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
-	tmp = RREG8(DAC_DATA);
-	tmp |= 0x8;
-	WREG8(DAC_DATA, tmp);
-
-	/* wait 10 us */
-	udelay(10);
-
-	/* 3- deassert rstlvl2 */
-	tmp &= ~0x08;
-	WREG8(DAC_INDEX, MGA1064_REMHEADCTL2);
-	WREG8(DAC_DATA, tmp);
-
-	/* 4- remove mask of scan request */
-	WREG8(DAC_INDEX, MGA1064_SPAREREG);
-	tmp = RREG8(DAC_DATA);
-	tmp &= ~0x80;
-	WREG8(DAC_DATA, tmp);
-
-	/* 5- put back a 0 on the misc<0> line */
-	WREG8(DAC_INDEX, MGA1064_GEN_IO_DATA);
-	tmp = RREG8(DAC_DATA);
-	tmp &= ~0x10;
-	WREG_DAC(MGA1064_GEN_IO_DATA, tmp);
-}
-
 /*
  * This is how the framebuffer base address is stored in g200 cards:
  *   * Assume @offset is the gpu_addr variable of the framebuffer object
@@ -804,14 +715,15 @@ static void mgag200_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 {
 	struct drm_device *dev = crtc->dev;
 	struct mga_device *mdev = to_mga_device(dev);
+	const struct mgag200_device_funcs *funcs = mdev->funcs;
 	struct drm_crtc_state *crtc_state = crtc->state;
 	struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
 	struct mgag200_crtc_state *mgag200_crtc_state = to_mgag200_crtc_state(crtc_state);
 	const struct drm_format_info *format = mgag200_crtc_state->format;
 	struct mgag200_pll *pixpll = &mdev->pixpll;
 
-	if (mdev->type == G200_WB || mdev->type == G200_EW3)
-		mgag200_g200wb_hold_bmc(mdev);
+	if (funcs->disable_vidrst)
+		funcs->disable_vidrst(mdev);
 
 	mgag200_set_format_regs(mdev, format);
 	mgag200_set_mode_regs(mdev, adjusted_mode);
@@ -828,22 +740,23 @@ static void mgag200_crtc_helper_atomic_enable(struct drm_crtc *crtc,
 
 	mgag200_enable_display(mdev);
 
-	if (mdev->type == G200_WB || mdev->type == G200_EW3)
-		mgag200_g200wb_release_bmc(mdev);
+	if (funcs->enable_vidrst)
+		funcs->enable_vidrst(mdev);
 }
 
 static void mgag200_crtc_helper_atomic_disable(struct drm_crtc *crtc,
 					       struct drm_atomic_state *old_state)
 {
 	struct mga_device *mdev = to_mga_device(crtc->dev);
+	const struct mgag200_device_funcs *funcs = mdev->funcs;
 
-	if (mdev->type == G200_WB || mdev->type == G200_EW3)
-		mgag200_g200wb_hold_bmc(mdev);
+	if (funcs->disable_vidrst)
+		funcs->disable_vidrst(mdev);
 
 	mgag200_disable_display(mdev);
 
-	if (mdev->type == G200_WB || mdev->type == G200_EW3)
-		mgag200_g200wb_release_bmc(mdev);
+	if (funcs->enable_vidrst)
+		funcs->enable_vidrst(mdev);
 }
 
 static const struct drm_crtc_helper_funcs mgag200_crtc_helper_funcs = {
