Merge tag 'sti-drm-next-2017-01-06' of https://github.com/vinceab/linux into drm-next

stih410 cleanup, create fbdev at binding, HQVDP fixes.

* tag 'sti-drm-next-2017-01-06' of https://github.com/vinceab/linux:
  drm/sti: sti_vtg: Handle return NULL error from devm_ioremap_nocache
  drm/sti: remove deprecated sti_vtac.c file
  drm/sti: create fbdev at binding
  drm/sti: update fps debugfs entries
  drm/sti: do not post HQVDP command if no update
  drm/sti: load XP70 firmware only once
  drm/sti: allow audio playback on HDMI even if disabled.

9 files changed, 154 insertions, 350 deletions

diff --git a/drivers/gpu/drm/sti/Makefile b/drivers/gpu/drm/sti/Makefile
index d20f7c0b4eac..c35db12435c3 100644
--- a/drivers/gpu/drm/sti/Makefile
+++ b/drivers/gpu/drm/sti/Makefile
@@ -13,7 +13,6 @@ sti-drm-y := \
 	sti_dvo.o \
 	sti_awg_utils.o \
 	sti_vtg.o \
-	sti_vtac.o \
 	sti_hda.o \
 	sti_tvout.o \
 	sti_hqvdp.o \
diff --git a/drivers/gpu/drm/sti/sti_drv.c b/drivers/gpu/drm/sti/sti_drv.c
index ff71e25ab5bf..278a63f10d9f 100644
--- a/drivers/gpu/drm/sti/sti_drv.c
+++ b/drivers/gpu/drm/sti/sti_drv.c
@@ -252,19 +252,7 @@ static void sti_output_poll_changed(struct drm_device *ddev)
 {
 	struct sti_private *private = ddev->dev_private;
 
-	if (!ddev->mode_config.num_connector)
-		return;
-
-	if (private->fbdev) {
-		drm_fbdev_cma_hotplug_event(private->fbdev);
-		return;
-	}
-
-	private->fbdev = drm_fbdev_cma_init(ddev, 32,
-					    ddev->mode_config.num_crtc,
-					    ddev->mode_config.num_connector);
-	if (IS_ERR(private->fbdev))
-		private->fbdev = NULL;
+	drm_fbdev_cma_hotplug_event(private->fbdev);
 }
 
 static const struct drm_mode_config_funcs sti_mode_config_funcs = {
@@ -382,6 +370,8 @@ static void sti_cleanup(struct drm_device *ddev)
 static int sti_bind(struct device *dev)
 {
 	struct drm_device *ddev;
+	struct sti_private *private;
+	struct drm_fbdev_cma *fbdev;
 	int ret;
 
 	ddev = drm_dev_alloc(&sti_driver, dev);
@@ -404,6 +394,17 @@ static int sti_bind(struct device *dev)
 
 	drm_mode_config_reset(ddev);
 
+	private = ddev->dev_private;
+	if (ddev->mode_config.num_connector) {
+		fbdev = drm_fbdev_cma_init(ddev, 32, ddev->mode_config.num_crtc,
+					   ddev->mode_config.num_connector);
+		if (IS_ERR(fbdev)) {
+			DRM_DEBUG_DRIVER("Warning: fails to create fbdev\n");
+			fbdev = NULL;
+		}
+		private->fbdev = fbdev;
+	}
+
 	return 0;
 
 err_register:
@@ -476,7 +477,6 @@ static struct platform_driver sti_platform_driver = {
 
 static struct platform_driver * const drivers[] = {
 	&sti_tvout_driver,
-	&sti_vtac_driver,
 	&sti_hqvdp_driver,
 	&sti_hdmi_driver,
 	&sti_hda_driver,
diff --git a/drivers/gpu/drm/sti/sti_drv.h b/drivers/gpu/drm/sti/sti_drv.h
index 78ebe5e30f53..4c75845cc9ab 100644
--- a/drivers/gpu/drm/sti/sti_drv.h
+++ b/drivers/gpu/drm/sti/sti_drv.h
@@ -34,7 +34,6 @@ struct sti_private {
 };
 
 extern struct platform_driver sti_tvout_driver;
-extern struct platform_driver sti_vtac_driver;
 extern struct platform_driver sti_hqvdp_driver;
 extern struct platform_driver sti_hdmi_driver;
 extern struct platform_driver sti_hda_driver;
diff --git a/drivers/gpu/drm/sti/sti_hdmi.c b/drivers/gpu/drm/sti/sti_hdmi.c
index f0af1ae82ee9..5ef1d1fce6d1 100644
--- a/drivers/gpu/drm/sti/sti_hdmi.c
+++ b/drivers/gpu/drm/sti/sti_hdmi.c
@@ -788,6 +788,95 @@ static void sti_hdmi_disable(struct drm_bridge *bridge)
 	hdmi->enabled = false;
 }
 
+/**
+ * sti_hdmi_audio_get_non_coherent_n() - get N parameter for non-coherent
+ * clocks. None-coherent clocks means that audio and TMDS clocks have not the
+ * same source (drifts between clocks). In this case assumption is that CTS is
+ * automatically calculated by hardware.
+ *
+ * @audio_fs: audio frame clock frequency in Hz
+ *
+ * Values computed are based on table described in HDMI specification 1.4b
+ *
+ * Returns n value.
+ */
+static int sti_hdmi_audio_get_non_coherent_n(unsigned int audio_fs)
+{
+	unsigned int n;
+
+	switch (audio_fs) {
+	case 32000:
+		n = 4096;
+		break;
+	case 44100:
+		n = 6272;
+		break;
+	case 48000:
+		n = 6144;
+		break;
+	case 88200:
+		n = 6272 * 2;
+		break;
+	case 96000:
+		n = 6144 * 2;
+		break;
+	case 176400:
+		n = 6272 * 4;
+		break;
+	case 192000:
+		n = 6144 * 4;
+		break;
+	default:
+		/* Not pre-defined, recommended value: 128 * fs / 1000 */
+		n = (audio_fs * 128) / 1000;
+	}
+
+	return n;
+}
+
+static int hdmi_audio_configure(struct sti_hdmi *hdmi)
+{
+	int audio_cfg, n;
+	struct hdmi_audio_params *params = &hdmi->audio;
+	struct hdmi_audio_infoframe *info = &params->cea;
+
+	DRM_DEBUG_DRIVER("\n");
+
+	if (!hdmi->enabled)
+		return 0;
+
+	/* update N parameter */
+	n = sti_hdmi_audio_get_non_coherent_n(params->sample_rate);
+
+	DRM_DEBUG_DRIVER("Audio rate = %d Hz, TMDS clock = %d Hz, n = %d\n",
+			 params->sample_rate, hdmi->mode.clock * 1000, n);
+	hdmi_write(hdmi, n, HDMI_AUDN);
+
+	/* update HDMI registers according to configuration */
+	audio_cfg = HDMI_AUD_CFG_SPDIF_DIV_2 | HDMI_AUD_CFG_DTS_INVALID |
+		    HDMI_AUD_CFG_ONE_BIT_INVALID;
+
+	switch (info->channels) {
+	case 8:
+		audio_cfg |= HDMI_AUD_CFG_CH78_VALID;
+	case 6:
+		audio_cfg |= HDMI_AUD_CFG_CH56_VALID;
+	case 4:
+		audio_cfg |= HDMI_AUD_CFG_CH34_VALID | HDMI_AUD_CFG_8CH;
+	case 2:
+		audio_cfg |= HDMI_AUD_CFG_CH12_VALID;
+		break;
+	default:
+		DRM_ERROR("ERROR: Unsupported number of channels (%d)!\n",
+			  info->channels);
+		return -EINVAL;
+	}
+
+	hdmi_write(hdmi, audio_cfg, HDMI_AUDIO_CFG);
+
+	return hdmi_audio_infoframe_config(hdmi);
+}
+
 static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
 {
 	struct sti_hdmi *hdmi = bridge->driver_private;
@@ -826,9 +915,12 @@ static void sti_hdmi_pre_enable(struct drm_bridge *bridge)
 	if (hdmi_avi_infoframe_config(hdmi))
 		DRM_ERROR("Unable to configure AVI infoframe\n");
 
-	/* Program AUDIO infoframe */
-	if (hdmi_audio_infoframe_config(hdmi))
-		DRM_ERROR("Unable to configure AUDIO infoframe\n");
+	if (hdmi->audio.enabled) {
+		if (hdmi_audio_configure(hdmi))
+			DRM_ERROR("Unable to configure audio\n");
+	} else {
+		hdmi_audio_infoframe_config(hdmi);
+	}
 
 	/* Program VS infoframe */
 	if (hdmi_vendor_infoframe_config(hdmi))
@@ -1078,97 +1170,6 @@ static struct drm_encoder *sti_hdmi_find_encoder(struct drm_device *dev)
 	return NULL;
 }
 
-/**
- * sti_hdmi_audio_get_non_coherent_n() - get N parameter for non-coherent
- * clocks. None-coherent clocks means that audio and TMDS clocks have not the
- * same source (drifts between clocks). In this case assumption is that CTS is
- * automatically calculated by hardware.
- *
- * @audio_fs: audio frame clock frequency in Hz
- *
- * Values computed are based on table described in HDMI specification 1.4b
- *
- * Returns n value.
- */
-static int sti_hdmi_audio_get_non_coherent_n(unsigned int audio_fs)
-{
-	unsigned int n;
-
-	switch (audio_fs) {
-	case 32000:
-		n = 4096;
-		break;
-	case 44100:
-		n = 6272;
-		break;
-	case 48000:
-		n = 6144;
-		break;
-	case 88200:
-		n = 6272 * 2;
-		break;
-	case 96000:
-		n = 6144 * 2;
-		break;
-	case 176400:
-		n = 6272 * 4;
-		break;
-	case 192000:
-		n = 6144 * 4;
-		break;
-	default:
-		/* Not pre-defined, recommended value: 128 * fs / 1000 */
-		n = (audio_fs * 128) / 1000;
-	}
-
-	return n;
-}
-
-static int hdmi_audio_configure(struct sti_hdmi *hdmi,
-				struct hdmi_audio_params *params)
-{
-	int audio_cfg, n;
-	struct hdmi_audio_infoframe *info = &params->cea;
-
-	DRM_DEBUG_DRIVER("\n");
-
-	if (!hdmi->enabled)
-		return 0;
-
-	/* update N parameter */
-	n = sti_hdmi_audio_get_non_coherent_n(params->sample_rate);
-
-	DRM_DEBUG_DRIVER("Audio rate = %d Hz, TMDS clock = %d Hz, n = %d\n",
-			 params->sample_rate, hdmi->mode.clock * 1000, n);
-	hdmi_write(hdmi, n, HDMI_AUDN);
-
-	/* update HDMI registers according to configuration */
-	audio_cfg = HDMI_AUD_CFG_SPDIF_DIV_2 | HDMI_AUD_CFG_DTS_INVALID |
-		    HDMI_AUD_CFG_ONE_BIT_INVALID;
-
-	switch (info->channels) {
-	case 8:
-		audio_cfg |= HDMI_AUD_CFG_CH78_VALID;
-	case 6:
-		audio_cfg |= HDMI_AUD_CFG_CH56_VALID;
-	case 4:
-		audio_cfg |= HDMI_AUD_CFG_CH34_VALID | HDMI_AUD_CFG_8CH;
-	case 2:
-		audio_cfg |= HDMI_AUD_CFG_CH12_VALID;
-		break;
-	default:
-		DRM_ERROR("ERROR: Unsupported number of channels (%d)!\n",
-			  info->channels);
-		return -EINVAL;
-	}
-
-	hdmi_write(hdmi, audio_cfg, HDMI_AUDIO_CFG);
-
-	hdmi->audio = *params;
-
-	return hdmi_audio_infoframe_config(hdmi);
-}
-
 static void hdmi_audio_shutdown(struct device *dev, void *data)
 {
 	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
@@ -1192,17 +1193,9 @@ static int hdmi_audio_hw_params(struct device *dev,
 {
 	struct sti_hdmi *hdmi = dev_get_drvdata(dev);
 	int ret;
-	struct hdmi_audio_params audio = {
-		.sample_width = params->sample_width,
-		.sample_rate = params->sample_rate,
-		.cea = params->cea,
-	};
 
 	DRM_DEBUG_DRIVER("\n");
 
-	if (!hdmi->enabled)
-		return 0;
-
 	if ((daifmt->fmt != HDMI_I2S) || daifmt->bit_clk_inv ||
 	    daifmt->frame_clk_inv || daifmt->bit_clk_master ||
 	    daifmt->frame_clk_master) {
@@ -1213,9 +1206,13 @@ static int hdmi_audio_hw_params(struct device *dev,
 		return -EINVAL;
 	}
 
-	audio.enabled = true;
+	hdmi->audio.sample_width = params->sample_width;
+	hdmi->audio.sample_rate = params->sample_rate;
+	hdmi->audio.cea = params->cea;
+
+	hdmi->audio.enabled = true;
 
-	ret = hdmi_audio_configure(hdmi, &audio);
+	ret = hdmi_audio_configure(hdmi);
 	if (ret < 0)
 		return ret;
 
diff --git a/drivers/gpu/drm/sti/sti_hqvdp.c b/drivers/gpu/drm/sti/sti_hqvdp.c
index becf10d255c4..4376fd8a8e52 100644
--- a/drivers/gpu/drm/sti/sti_hqvdp.c
+++ b/drivers/gpu/drm/sti/sti_hqvdp.c
@@ -332,6 +332,7 @@ struct sti_hqvdp_cmd {
  * @hqvdp_cmd_paddr:   physical address of hqvdp_cmd
  * @vtg:               vtg for main data path
  * @xp70_initialized:  true if xp70 is already initialized
+ * @vtg_registered:    true if registered to VTG
  */
 struct sti_hqvdp {
 	struct device *dev;
@@ -347,6 +348,7 @@ struct sti_hqvdp {
 	u32 hqvdp_cmd_paddr;
 	struct sti_vtg *vtg;
 	bool xp70_initialized;
+	bool vtg_registered;
 };
 
 #define to_sti_hqvdp(x) container_of(x, struct sti_hqvdp, plane)
@@ -771,7 +773,7 @@ static void sti_hqvdp_disable(struct sti_hqvdp *hqvdp)
 		DRM_ERROR("XP70 could not revert to idle\n");
 
 	hqvdp->plane.status = STI_PLANE_DISABLED;
-	hqvdp->xp70_initialized = false;
+	hqvdp->vtg_registered = false;
 }
 
 /**
@@ -1064,10 +1066,11 @@ static int sti_hqvdp_atomic_check(struct drm_plane *drm_plane,
 		return -EINVAL;
 	}
 
-	if (!hqvdp->xp70_initialized) {
+	if (!hqvdp->xp70_initialized)
 		/* Start HQVDP XP70 coprocessor */
 		sti_hqvdp_start_xp70(hqvdp);
 
+	if (!hqvdp->vtg_registered) {
 		/* Prevent VTG shutdown */
 		if (clk_prepare_enable(hqvdp->clk_pix_main)) {
 			DRM_ERROR("Failed to prepare/enable pix main clk\n");
@@ -1081,6 +1084,7 @@ static int sti_hqvdp_atomic_check(struct drm_plane *drm_plane,
 			DRM_ERROR("Cannot register VTG notifier\n");
 			return -EINVAL;
 		}
+		hqvdp->vtg_registered = true;
 	}
 
 	DRM_DEBUG_KMS("CRTC:%d (%s) drm plane:%d (%s)\n",
@@ -1113,6 +1117,21 @@ static void sti_hqvdp_atomic_update(struct drm_plane *drm_plane,
 	if (!crtc || !fb)
 		return;
 
+	if ((oldstate->fb == state->fb) &&
+	    (oldstate->crtc_x == state->crtc_x) &&
+	    (oldstate->crtc_y == state->crtc_y) &&
+	    (oldstate->crtc_w == state->crtc_w) &&
+	    (oldstate->crtc_h == state->crtc_h) &&
+	    (oldstate->src_x == state->src_x) &&
+	    (oldstate->src_y == state->src_y) &&
+	    (oldstate->src_w == state->src_w) &&
+	    (oldstate->src_h == state->src_h)) {
+		/* No change since last update, do not post cmd */
+		DRM_DEBUG_DRIVER("No change, not posting cmd\n");
+		plane->status = STI_PLANE_UPDATED;
+		return;
+	}
+
 	mode = &crtc->mode;
 	dst_x = state->crtc_x;
 	dst_y = state->crtc_y;
diff --git a/drivers/gpu/drm/sti/sti_plane.c b/drivers/gpu/drm/sti/sti_plane.c
index ca4b3719a64a..699094c559b4 100644
--- a/drivers/gpu/drm/sti/sti_plane.c
+++ b/drivers/gpu/drm/sti/sti_plane.c
@@ -65,9 +65,18 @@ void sti_plane_update_fps(struct sti_plane *plane,
 
 	fps->last_timestamp = now;
 	fps->last_frame_counter = fps->curr_frame_counter;
-	fpks = (num_frames * 1000000) / ms_since_last;
-	snprintf(plane->fps_info.fps_str, FPS_LENGTH, "%-6s @ %d.%.3d fps",
-		 sti_plane_to_str(plane), fpks / 1000, fpks % 1000);
+
+	if (plane->drm_plane.fb) {
+		fpks = (num_frames * 1000000) / ms_since_last;
+		snprintf(plane->fps_info.fps_str, FPS_LENGTH,
+			 "%-8s %4dx%-4d %.4s @ %3d.%-3.3d fps (%s)",
+			 plane->drm_plane.name,
+			 plane->drm_plane.fb->width,
+			 plane->drm_plane.fb->height,
+			 (char *)&plane->drm_plane.fb->pixel_format,
+			 fpks / 1000, fpks % 1000,
+			 sti_plane_to_str(plane));
+	}
 
 	if (fps->curr_field_counter) {
 		/* Compute number of field updates */
@@ -75,7 +84,7 @@ void sti_plane_update_fps(struct sti_plane *plane,
 		fps->last_field_counter = fps->curr_field_counter;
 		fipks = (num_fields * 1000000) / ms_since_last;
 		snprintf(plane->fps_info.fips_str,
-			 FPS_LENGTH, " - %d.%.3d field/sec",
+			 FPS_LENGTH, " - %3d.%-3.3d field/sec",
 			 fipks / 1000, fipks % 1000);
 	} else {
 		plane->fps_info.fips_str[0] = '\0';
diff --git a/drivers/gpu/drm/sti/sti_plane.h b/drivers/gpu/drm/sti/sti_plane.h
index ce3e8d6c88bb..c36c13faaa18 100644
--- a/drivers/gpu/drm/sti/sti_plane.h
+++ b/drivers/gpu/drm/sti/sti_plane.h
@@ -48,7 +48,7 @@ enum sti_plane_status {
 	STI_PLANE_DISABLED,
 };
 
-#define FPS_LENGTH 64
+#define FPS_LENGTH 128
 struct sti_fps_info {
 	bool output;
 	unsigned int curr_frame_counter;
diff --git a/drivers/gpu/drm/sti/sti_vtac.c b/drivers/gpu/drm/sti/sti_vtac.c
deleted file mode 100644
index cf7fe8a1db42..000000000000
--- a/drivers/gpu/drm/sti/sti_vtac.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/*
- * Copyright (C) STMicroelectronics SA 2014
- * Author: Benjamin Gaignard <benjamin.gaignard@st.com> for STMicroelectronics.
- * License terms:  GNU General Public License (GPL), version 2
- */
-
-#include <linux/clk.h>
-#include <linux/io.h>
-#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/platform_device.h>
-
-#include <drm/drmP.h>
-
-#include "sti_drv.h"
-
-/* registers offset */
-#define VTAC_CONFIG                     0x00
-#define VTAC_RX_FIFO_CONFIG             0x04
-#define VTAC_FIFO_CONFIG_VAL            0x04
-
-#define VTAC_SYS_CFG8521                0x824
-#define VTAC_SYS_CFG8522                0x828
-
-/* Number of phyts per pixel */
-#define VTAC_2_5_PPP                    0x0005
-#define VTAC_3_PPP                      0x0006
-#define VTAC_4_PPP                      0x0008
-#define VTAC_5_PPP                      0x000A
-#define VTAC_6_PPP                      0x000C
-#define VTAC_13_PPP                     0x001A
-#define VTAC_14_PPP                     0x001C
-#define VTAC_15_PPP                     0x001E
-#define VTAC_16_PPP                     0x0020
-#define VTAC_17_PPP                     0x0022
-#define VTAC_18_PPP                     0x0024
-
-/* enable bits */
-#define VTAC_ENABLE                     0x3003
-
-#define VTAC_TX_PHY_ENABLE_CLK_PHY      BIT(0)
-#define VTAC_TX_PHY_ENABLE_CLK_DLL      BIT(1)
-#define VTAC_TX_PHY_PLL_NOT_OSC_MODE    BIT(3)
-#define VTAC_TX_PHY_RST_N_DLL_SWITCH    BIT(4)
-#define VTAC_TX_PHY_PROG_N3             BIT(9)
-
-
-/**
- * VTAC mode structure
- *
- * @vid_in_width: Video Data Resolution
- * @phyts_width: Width of phyt buses(phyt low and phyt high).
- * @phyts_per_pixel: Number of phyts sent per pixel
- */
-struct sti_vtac_mode {
-	u32 vid_in_width;
-	u32 phyts_width;
-	u32 phyts_per_pixel;
-};
-
-static const struct sti_vtac_mode vtac_mode_main = {
-	.vid_in_width = 0x2,
-	.phyts_width = 0x2,
-	.phyts_per_pixel = VTAC_5_PPP,
-};
-static const struct sti_vtac_mode vtac_mode_aux = {
-	.vid_in_width = 0x1,
-	.phyts_width = 0x0,
-	.phyts_per_pixel = VTAC_17_PPP,
-};
-
-/**
- * VTAC structure
- *
- * @dev: pointer to device structure
- * @regs: ioremapped registers for RX and TX devices
- * @phy_regs: phy registers for TX device
- * @clk: clock
- * @mode: main or auxillary configuration mode
- */
-struct sti_vtac {
-	struct device *dev;
-	void __iomem *regs;
-	void __iomem *phy_regs;
-	struct clk *clk;
-	const struct sti_vtac_mode *mode;
-};
-
-static void sti_vtac_rx_set_config(struct sti_vtac *vtac)
-{
-	u32 config;
-
-	/* Enable VTAC clock */
-	if (clk_prepare_enable(vtac->clk))
-		DRM_ERROR("Failed to prepare/enable vtac_rx clock.\n");
-
-	writel(VTAC_FIFO_CONFIG_VAL, vtac->regs + VTAC_RX_FIFO_CONFIG);
-
-	config = VTAC_ENABLE;
-	config |= vtac->mode->vid_in_width << 4;
-	config |= vtac->mode->phyts_width << 16;
-	config |= vtac->mode->phyts_per_pixel << 23;
-	writel(config, vtac->regs + VTAC_CONFIG);
-}
-
-static void sti_vtac_tx_set_config(struct sti_vtac *vtac)
-{
-	u32 phy_config;
-	u32 config;
-
-	/* Enable VTAC clock */
-	if (clk_prepare_enable(vtac->clk))
-		DRM_ERROR("Failed to prepare/enable vtac_tx clock.\n");
-
-	/* Configure vtac phy */
-	phy_config = 0x00000000;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8522);
-	phy_config = VTAC_TX_PHY_ENABLE_CLK_PHY;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config |= VTAC_TX_PHY_PROG_N3;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config |= VTAC_TX_PHY_ENABLE_CLK_DLL;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config |= VTAC_TX_PHY_RST_N_DLL_SWITCH;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config = readl(vtac->phy_regs + VTAC_SYS_CFG8521);
-	phy_config |= VTAC_TX_PHY_PLL_NOT_OSC_MODE;
-	writel(phy_config, vtac->phy_regs + VTAC_SYS_CFG8521);
-
-	/* Configure vtac tx */
-	config = VTAC_ENABLE;
-	config |= vtac->mode->vid_in_width << 4;
-	config |= vtac->mode->phyts_width << 16;
-	config |= vtac->mode->phyts_per_pixel << 23;
-	writel(config, vtac->regs + VTAC_CONFIG);
-}
-
-static const struct of_device_id vtac_of_match[] = {
-	{
-		.compatible = "st,vtac-main",
-		.data = &vtac_mode_main,
-	}, {
-		.compatible = "st,vtac-aux",
-		.data = &vtac_mode_aux,
-	}, {
-		/* end node */
-	}
-};
-MODULE_DEVICE_TABLE(of, vtac_of_match);
-
-static int sti_vtac_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct device_node *np = dev->of_node;
-	const struct of_device_id *id;
-	struct sti_vtac *vtac;
-	struct resource *res;
-
-	vtac = devm_kzalloc(dev, sizeof(*vtac), GFP_KERNEL);
-	if (!vtac)
-		return -ENOMEM;
-
-	vtac->dev = dev;
-
-	id = of_match_node(vtac_of_match, np);
-	if (!id)
-		return -ENOMEM;
-
-	vtac->mode = id->data;
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
-	if (!res) {
-		DRM_ERROR("Invalid resource\n");
-		return -ENOMEM;
-	}
-	vtac->regs = devm_ioremap_resource(dev, res);
-	if (IS_ERR(vtac->regs))
-		return PTR_ERR(vtac->regs);
-
-
-	vtac->clk = devm_clk_get(dev, "vtac");
-	if (IS_ERR(vtac->clk)) {
-		DRM_ERROR("Cannot get vtac clock\n");
-		return PTR_ERR(vtac->clk);
-	}
-
-	res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
-	if (res) {
-		vtac->phy_regs = devm_ioremap_nocache(dev, res->start,
-						 resource_size(res));
-		sti_vtac_tx_set_config(vtac);
-	} else {
-
-		sti_vtac_rx_set_config(vtac);
-	}
-
-	platform_set_drvdata(pdev, vtac);
-	DRM_INFO("%s %s\n", __func__, dev_name(vtac->dev));
-
-	return 0;
-}
-
-static int sti_vtac_remove(struct platform_device *pdev)
-{
-	return 0;
-}
-
-struct platform_driver sti_vtac_driver = {
-	.driver = {
-		.name = "sti-vtac",
-		.owner = THIS_MODULE,
-		.of_match_table = vtac_of_match,
-	},
-	.probe = sti_vtac_probe,
-	.remove = sti_vtac_remove,
-};
-
-MODULE_AUTHOR("Benjamin Gaignard <benjamin.gaignard@st.com>");
-MODULE_DESCRIPTION("STMicroelectronics SoC DRM driver");
-MODULE_LICENSE("GPL");
diff --git a/drivers/gpu/drm/sti/sti_vtg.c b/drivers/gpu/drm/sti/sti_vtg.c
index a8882bdd0f8b..c3d9c8ae14af 100644
--- a/drivers/gpu/drm/sti/sti_vtg.c
+++ b/drivers/gpu/drm/sti/sti_vtg.c
@@ -429,6 +429,10 @@ static int vtg_probe(struct platform_device *pdev)
 		return -ENOMEM;
 	}
 	vtg->regs = devm_ioremap_nocache(dev, res->start, resource_size(res));
+	if (!vtg->regs) {
+		DRM_ERROR("failed to remap I/O memory\n");
+		return -ENOMEM;
+	}
 
 	np = of_parse_phandle(pdev->dev.of_node, "st,slave", 0);
 	if (np) {