drm/omap: Remove connection checks from internal encoders .enable()

The internal encoders return an error from their .enable() handler when
their are not connected to a dss manager. As the flag used is set and
cleared in the connect and disconnect handlers, this effectively checks
whether the omap_dss_device is connected.

The .enable() handler is called from code paths that access the dss
devices chain from the display device, which is set to NULL when the
device isn't connected, making it impossible to access the device in
that case.

The safety check is thus not needed, remove it.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/dpi.c

@@ -386,12 +386,6 @@ static int dpi_display_enable(struct omap_dss_device *dssdev)
 
 	mutex_lock(&dpi->lock);
 
-	if (!out->dispc_channel_connected) {
-		DSSERR("failed to enable display: no output/manager\n");
-		r = -ENODEV;
-		goto err_no_out_mgr;
-	}
-
 	if (dpi->vdds_dsi_reg) {
 		r = regulator_enable(dpi->vdds_dsi_reg);
 		if (r)
@@ -439,7 +433,6 @@ static int dpi_display_enable(struct omap_dss_device *dssdev)
 	if (dpi->vdds_dsi_reg)
 		regulator_disable(dpi->vdds_dsi_reg);
 err_reg_enable:
-err_no_out_mgr:
 	mutex_unlock(&dpi->lock);
 	return r;
 }
@@ -596,23 +589,15 @@ static int dpi_connect(struct omap_dss_device *src,
 		       struct omap_dss_device *dst)
 {
 	struct dpi_data *dpi = dpi_get_data_from_dssdev(dst);
-	int r;
 
 	dpi_init_pll(dpi);
 
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void dpi_disconnect(struct omap_dss_device *src,
 			   struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }
 

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -3753,19 +3753,13 @@ static int dsi_enable_video_output(struct omap_dss_device *dssdev, int channel)
 {
 	struct dsi_data *dsi = to_dsi_data(dssdev);
 	int bpp = dsi_get_pixel_size(dsi->pix_fmt);
-	struct omap_dss_device *out = &dsi->output;
 	u8 data_type;
 	u16 word_count;
 	int r;
 
-	if (!out->dispc_channel_connected) {
-		DSSERR("failed to enable display: no output/manager\n");
-		return -ENODEV;
-	}
-
 	r = dsi_display_init_dispc(dsi);
 	if (r)
-		goto err_init_dispc;
+		return r;
 
 	if (dsi->mode == OMAP_DSS_DSI_VIDEO_MODE) {
 		switch (dsi->pix_fmt) {
@@ -3814,7 +3808,6 @@ static int dsi_enable_video_output(struct omap_dss_device *dssdev, int channel)
 	}
 err_pix_fmt:
 	dsi_display_uninit_dispc(dsi);
-err_init_dispc:
 	return r;
 }
 
@@ -4888,21 +4881,12 @@ static int dsi_get_clocks(struct dsi_data *dsi)
 static int dsi_connect(struct omap_dss_device *src,
 		       struct omap_dss_device *dst)
 {
-	int r;
-
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void dsi_disconnect(struct omap_dss_device *src,
 			   struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }
 

drivers/gpu/drm/omapdrm/dss/hdmi4.c

@@ -322,12 +322,6 @@ static int hdmi_display_enable(struct omap_dss_device *dssdev)
 
 	mutex_lock(&hdmi->lock);
 
-	if (!dssdev->dispc_channel_connected) {
-		DSSERR("failed to enable display: no output/manager\n");
-		r = -ENODEV;
-		goto err0;
-	}
-
 	r = hdmi_power_on_full(hdmi);
 	if (r) {
 		DSSERR("failed to power on device\n");
@@ -417,21 +411,12 @@ void hdmi4_core_disable(struct hdmi_core_data *core)
 static int hdmi_connect(struct omap_dss_device *src,
 			struct omap_dss_device *dst)
 {
-	int r;
-
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void hdmi_disconnect(struct omap_dss_device *src,
 			    struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }
 

drivers/gpu/drm/omapdrm/dss/hdmi5.c

@@ -330,12 +330,6 @@ static int hdmi_display_enable(struct omap_dss_device *dssdev)
 
 	mutex_lock(&hdmi->lock);
 
-	if (!dssdev->dispc_channel_connected) {
-		DSSERR("failed to enable display: no output/manager\n");
-		r = -ENODEV;
-		goto err0;
-	}
-
 	r = hdmi_power_on_full(hdmi);
 	if (r) {
 		DSSERR("failed to power on device\n");
@@ -422,21 +416,12 @@ static void hdmi_core_disable(struct omap_hdmi *hdmi)
 static int hdmi_connect(struct omap_dss_device *src,
 			struct omap_dss_device *dst)
 {
-	int r;
-
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void hdmi_disconnect(struct omap_dss_device *src,
 			    struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }
 

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -440,7 +440,6 @@ struct omap_dss_device {
 
 	/* DISPC channel for this output */
 	enum omap_channel dispc_channel;
-	bool dispc_channel_connected;
 
 	/* output instance */
 	enum omap_dss_output_id id;

drivers/gpu/drm/omapdrm/dss/sdi.c

@@ -136,11 +136,6 @@ static int sdi_display_enable(struct omap_dss_device *dssdev)
 	unsigned long fck;
 	int r;
 
-	if (!sdi->output.dispc_channel_connected) {
-		DSSERR("failed to enable display: no output/manager\n");
-		return -ENODEV;
-	}
-
 	r = regulator_enable(sdi->vdds_sdi_reg);
 	if (r)
 		goto err_reg_enable;
@@ -251,21 +246,12 @@ static int sdi_check_timings(struct omap_dss_device *dssdev,
 static int sdi_connect(struct omap_dss_device *src,
 		       struct omap_dss_device *dst)
 {
-	int r;
-
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void sdi_disconnect(struct omap_dss_device *src,
 			   struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }
 

drivers/gpu/drm/omapdrm/dss/venc.c

@@ -531,12 +531,6 @@ static int venc_display_enable(struct omap_dss_device *dssdev)
 
 	mutex_lock(&venc->venc_lock);
 
-	if (!dssdev->dispc_channel_connected) {
-		DSSERR("Failed to enable display: no output/manager\n");
-		r = -ENODEV;
-		goto err0;
-	}
-
 	r = venc_power_on(venc);
 	if (r)
 		goto err0;
@@ -687,21 +681,12 @@ static int venc_get_clocks(struct venc_device *venc)
 static int venc_connect(struct omap_dss_device *src,
 			struct omap_dss_device *dst)
 {
-	int r;
-
-	r = omapdss_device_connect(dst->dss, dst, dst->next);
-	if (r)
-		return r;
-
-	dst->dispc_channel_connected = true;
-	return 0;
+	return omapdss_device_connect(dst->dss, dst, dst->next);
 }
 
 static void venc_disconnect(struct omap_dss_device *src,
 			    struct omap_dss_device *dst)
 {
-	dst->dispc_channel_connected = false;
-
 	omapdss_device_disconnect(dst, dst->next);
 }