diff --git a/drivers/gpu/drm/mediatek/Kconfig b/drivers/gpu/drm/mediatek/Kconfig
index 294de4549922..119ec0a21de2 100644
--- a/drivers/gpu/drm/mediatek/Kconfig
+++ b/drivers/gpu/drm/mediatek/Kconfig
@@ -11,6 +11,7 @@ config DRM_MEDIATEK
 	select DRM_PANEL
 	select MEMORY
 	select MTK_SMI
+	select VIDEOMODE_HELPERS
 	help
 	  Choose this option if you have a Mediatek SoCs.
 	  The module will be called mediatek-drm
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index e80a603e5fb0..6c0ea39d5739 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -22,6 +22,7 @@
 #include <linux/interrupt.h>
 #include <linux/types.h>
 #include <linux/clk.h>
+#include <video/videomode.h>
 
 #include "mtk_dpi_regs.h"
 #include "mtk_drm_ddp_comp.h"
@@ -429,34 +430,35 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 	struct mtk_dpi_sync_param vsync_leven = { 0 };
 	struct mtk_dpi_sync_param vsync_rodd = { 0 };
 	struct mtk_dpi_sync_param vsync_reven = { 0 };
-	unsigned long pix_rate;
+	struct videomode vm = { 0 };
 	unsigned long pll_rate;
 	unsigned int factor;
 
 	/* let pll_rate can fix the valid range of tvdpll (1G~2GHz) */
-	pix_rate = 1000UL * mode->clock;
+
 	if (mode->clock <= 27000)
-		factor = 16 * 3;
+		factor = 3 << 4;
 	else if (mode->clock <= 84000)
-		factor = 8 * 3;
+		factor = 3 << 3;
 	else if (mode->clock <= 167000)
-		factor = 4 * 3;
+		factor = 3 << 2;
 	else
-		factor = 2 * 3;
-	pll_rate = pix_rate * factor;
+		factor = 3 << 1;
+	drm_display_mode_to_videomode(mode, &vm);
+	pll_rate = vm.pixelclock * factor;
 
 	dev_dbg(dpi->dev, "Want PLL %lu Hz, pixel clock %lu Hz\n",
-		pll_rate, pix_rate);
+		pll_rate, vm.pixelclock);
 
 	clk_set_rate(dpi->tvd_clk, pll_rate);
 	pll_rate = clk_get_rate(dpi->tvd_clk);
 
-	pix_rate = pll_rate / factor;
-	clk_set_rate(dpi->pixel_clk, pix_rate);
-	pix_rate = clk_get_rate(dpi->pixel_clk);
+	vm.pixelclock = pll_rate / factor;
+	clk_set_rate(dpi->pixel_clk, vm.pixelclock);
+	vm.pixelclock = clk_get_rate(dpi->pixel_clk);
 
 	dev_dbg(dpi->dev, "Got  PLL %lu Hz, pixel clock %lu Hz\n",
-		pll_rate, pix_rate);
+		pll_rate, vm.pixelclock);
 
 	limit.c_bottom = 0x0010;
 	limit.c_top = 0x0FE0;
@@ -465,33 +467,31 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 
 	dpi_pol.ck_pol = MTK_DPI_POLARITY_FALLING;
 	dpi_pol.de_pol = MTK_DPI_POLARITY_RISING;
-	dpi_pol.hsync_pol = mode->flags & DRM_MODE_FLAG_PHSYNC ?
+	dpi_pol.hsync_pol = vm.flags & DISPLAY_FLAGS_HSYNC_HIGH ?
 			    MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
-	dpi_pol.vsync_pol = mode->flags & DRM_MODE_FLAG_PVSYNC ?
+	dpi_pol.vsync_pol = vm.flags & DISPLAY_FLAGS_VSYNC_HIGH ?
 			    MTK_DPI_POLARITY_FALLING : MTK_DPI_POLARITY_RISING;
-
-	hsync.sync_width = mode->hsync_end - mode->hsync_start;
-	hsync.back_porch = mode->htotal - mode->hsync_end;
-	hsync.front_porch = mode->hsync_start - mode->hdisplay;
+	hsync.sync_width = vm.hsync_len;
+	hsync.back_porch = vm.hback_porch;
+	hsync.front_porch = vm.hfront_porch;
 	hsync.shift_half_line = false;
-
-	vsync_lodd.sync_width = mode->vsync_end - mode->vsync_start;
-	vsync_lodd.back_porch = mode->vtotal - mode->vsync_end;
-	vsync_lodd.front_porch = mode->vsync_start - mode->vdisplay;
+	vsync_lodd.sync_width = vm.vsync_len;
+	vsync_lodd.back_porch = vm.vback_porch;
+	vsync_lodd.front_porch = vm.vfront_porch;
 	vsync_lodd.shift_half_line = false;
 
-	if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
+	if (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 	    mode->flags & DRM_MODE_FLAG_3D_MASK) {
 		vsync_leven = vsync_lodd;
 		vsync_rodd = vsync_lodd;
 		vsync_reven = vsync_lodd;
 		vsync_leven.shift_half_line = true;
 		vsync_reven.shift_half_line = true;
-	} else if (mode->flags & DRM_MODE_FLAG_INTERLACE &&
+	} else if (vm.flags & DISPLAY_FLAGS_INTERLACED &&
 		   !(mode->flags & DRM_MODE_FLAG_3D_MASK)) {
 		vsync_leven = vsync_lodd;
 		vsync_leven.shift_half_line = true;
-	} else if (!(mode->flags & DRM_MODE_FLAG_INTERLACE) &&
+	} else if (!(vm.flags & DISPLAY_FLAGS_INTERLACED) &&
 		   mode->flags & DRM_MODE_FLAG_3D_MASK) {
 		vsync_rodd = vsync_lodd;
 	}
@@ -505,12 +505,12 @@ static int mtk_dpi_set_display_mode(struct mtk_dpi *dpi,
 	mtk_dpi_config_vsync_reven(dpi, &vsync_reven);
 
 	mtk_dpi_config_3d(dpi, !!(mode->flags & DRM_MODE_FLAG_3D_MASK));
-	mtk_dpi_config_interface(dpi, !!(mode->flags &
-					 DRM_MODE_FLAG_INTERLACE));
-	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
-		mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay / 2);
+	mtk_dpi_config_interface(dpi, !!(vm.flags &
+					 DISPLAY_FLAGS_INTERLACED));
+	if (vm.flags & DISPLAY_FLAGS_INTERLACED)
+		mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive >> 1);
 	else
-		mtk_dpi_config_fb_size(dpi, mode->hdisplay, mode->vdisplay);
+		mtk_dpi_config_fb_size(dpi, vm.hactive, vm.vactive);
 
 	mtk_dpi_config_channel_limit(dpi, &limit);
 	mtk_dpi_config_bit_num(dpi, dpi->bit_num);
diff --git a/drivers/gpu/drm/mediatek/mtk_drm_gem.c b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
index f595ac816b55..259b7b0de1d2 100644
--- a/drivers/gpu/drm/mediatek/mtk_drm_gem.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_gem.c
@@ -220,7 +220,7 @@ struct drm_gem_object *mtk_gem_prime_import_sg_table(struct drm_device *dev,
 	mtk_gem = mtk_drm_gem_init(dev, attach->dmabuf->size);
 
 	if (IS_ERR(mtk_gem))
-		return ERR_PTR(PTR_ERR(mtk_gem));
+		return ERR_CAST(mtk_gem);
 
 	expected = sg_dma_address(sg->sgl);
 	for_each_sg(sg->sgl, s, sg->nents, i) {
diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c
index 7e5e24c2152a..aa0943ec32b0 100644
--- a/drivers/gpu/drm/mediatek/mtk_dsi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dsi.c
@@ -551,13 +551,12 @@ static int mtk_dsi_poweron(struct mtk_dsi *dsi)
 	}
 
 	/**
-	 * vm.pixelclock is in kHz, pixel_clock unit is Hz, so multiply by 1000
 	 * htotal_time = htotal * byte_per_pixel / num_lanes
 	 * overhead_time = lpx + hs_prepare + hs_zero + hs_trail + hs_exit
 	 * mipi_ratio = (htotal_time + overhead_time) / htotal_time
 	 * data_rate = pixel_clock * bit_per_pixel * mipi_ratio / num_lanes;
 	 */
-	pixel_clock = dsi->vm.pixelclock * 1000;
+	pixel_clock = dsi->vm.pixelclock;
 	htotal = dsi->vm.hactive + dsi->vm.hback_porch + dsi->vm.hfront_porch +
 			dsi->vm.hsync_len;
 	htotal_bits = htotal * bit_per_pixel;
@@ -725,16 +724,7 @@ static void mtk_dsi_encoder_mode_set(struct drm_encoder *encoder,
 {
 	struct mtk_dsi *dsi = encoder_to_dsi(encoder);
 
-	dsi->vm.pixelclock = adjusted->clock;
-	dsi->vm.hactive = adjusted->hdisplay;
-	dsi->vm.hback_porch = adjusted->htotal - adjusted->hsync_end;
-	dsi->vm.hfront_porch = adjusted->hsync_start - adjusted->hdisplay;
-	dsi->vm.hsync_len = adjusted->hsync_end - adjusted->hsync_start;
-
-	dsi->vm.vactive = adjusted->vdisplay;
-	dsi->vm.vback_porch = adjusted->vtotal - adjusted->vsync_end;
-	dsi->vm.vfront_porch = adjusted->vsync_start - adjusted->vdisplay;
-	dsi->vm.vsync_len = adjusted->vsync_end - adjusted->vsync_start;
+	drm_display_mode_to_videomode(adjusted, &dsi->vm);
 }
 
 static void mtk_dsi_encoder_disable(struct drm_encoder *encoder)