diff mbox series

[PATCHv2,13/56] drm/omap: dsi: switch dsi_vc_send_long/short to mipi_dsi_msg

Message ID 20200224232126.3385250-14-sebastian.reichel@collabora.com (mailing list archive)
State New, archived
Headers show
Series drm/omap: Convert DSI code to use drm_mipi_dsi and drm_panel | expand

Commit Message

Sebastian Reichel Feb. 24, 2020, 11:20 p.m. UTC 
Simplify the DSI encoder by using mipi_dsi_msg for
dsi_vc_send_long and dsi_vc_send_short. Further improvements
require cleaning up the channel allocation code first.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
---
 drivers/gpu/drm/omapdrm/dss/dsi.c | 92 +++++++++++++++----------------
 1 file changed, 45 insertions(+), 47 deletions(-)

Comments

Laurent Pinchart Feb. 25, 2020, 4:30 p.m. UTC | #1 
Hi Sebastian,

Thank you for the patch.

On Tue, Feb 25, 2020 at 12:20:43AM +0100, Sebastian Reichel wrote:
> Simplify the DSI encoder by using mipi_dsi_msg for
> dsi_vc_send_long and dsi_vc_send_short. Further improvements
> require cleaning up the channel allocation code first.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> ---
>  drivers/gpu/drm/omapdrm/dss/dsi.c | 92 +++++++++++++++----------------
>  1 file changed, 45 insertions(+), 47 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 9b5b078beb6d..4899bfa2d76f 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -2599,30 +2599,36 @@ static inline void dsi_vc_write_long_payload(struct dsi_data *dsi, int channel,
>  	dsi_write_reg(dsi, DSI_VC_LONG_PACKET_PAYLOAD(channel), val);
>  }
>  
> -static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
> -			    const u8 *data, u16 len, u8 ecc)
> +static int dsi_vc_send_long(struct dsi_data *dsi,
> +			    const struct mipi_dsi_msg *msg)
>  {
> +	struct mipi_dsi_packet pkg;
>  	/*u32 val; */
>  	int i;
>  	const u8 *p;
>  	int r = 0;
>  	u8 b1, b2, b3, b4;
>  
> +	r = mipi_dsi_create_packet(&pkg, msg);
> +	if (r < 0)
> +		return r;
> +
>  	if (dsi->debug_write)
> -		DSSDBG("dsi_vc_send_long, %d bytes\n", len);
> +		DSSDBG("dsi_vc_send_long, %d bytes\n", msg->tx_len);
>  
>  	/* len + header */
> -	if (dsi->vc[channel].tx_fifo_size * 32 * 4 < len + 4) {
> +	if (dsi->vc[msg->channel].tx_fifo_size * 32 * 4 < msg->tx_len + 4) {
>  		DSSERR("unable to send long packet: packet too long.\n");
>  		return -EINVAL;
>  	}
>  
> -	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
> +	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
>  
> -	dsi_vc_write_long_header(dsi, channel, data_type, len, ecc);
> +	dsi_vc_write_long_header(dsi, msg->channel, msg->type, msg->tx_len,
> +				 pkg.header[3]);

mipi_dsi_create_packet() never sets header[3]. I suppose that's not an
issue as we were always passing ecc as 0 to this function, but you may
want to drop mipi_dsi_create_packet() above and just hardcode 0 here.

>  
> -	p = data;
> -	for (i = 0; i < len >> 2; i++) {
> +	p = msg->tx_buf;
> +	for (i = 0; i < msg->tx_len >> 2; i++) {
>  		if (dsi->debug_write)
>  			DSSDBG("\tsending full packet %d\n", i);
>  
> @@ -2631,10 +2637,10 @@ static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
>  		b3 = *p++;
>  		b4 = *p++;
>  
> -		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, b4);
> +		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, b4);
>  	}
>  
> -	i = len % 4;
> +	i = msg->tx_len % 4;
>  	if (i) {
>  		b1 = 0; b2 = 0; b3 = 0;
>  
> @@ -2656,64 +2662,64 @@ static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
>  			break;
>  		}
>  
> -		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, 0);
> +		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, 0);
>  	}
>  
>  	return r;
>  }
>  
> -static int dsi_vc_send_short(struct dsi_data *dsi, int channel, u8 data_type,
> -			     u16 data, u8 ecc)
> +static int dsi_vc_send_short(struct dsi_data *dsi,
> +			     const struct mipi_dsi_msg *msg)
>  {
> +	struct mipi_dsi_packet pkg;

s/pkg/pkt/ (or packet)

>  	u32 r;
> -	u8 data_id;
> +
> +	r = mipi_dsi_create_packet(&pkg, msg);
> +	if (r < 0)
> +		return r;
>  
>  	WARN_ON(!dsi_bus_is_locked(dsi));
>  
>  	if (dsi->debug_write)
>  		DSSDBG("dsi_vc_send_short(ch%d, dt %#x, b1 %#x, b2 %#x)\n",
> -				channel,
> -				data_type, data & 0xff, (data >> 8) & 0xff);
> +				msg->channel,
> +				msg->type, pkg.header[1], pkg.header[2]);
>  
> -	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
> +	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
>  
> -	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(channel)), 16, 16)) {
> +	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(msg->channel)), 16, 16)) {
>  		DSSERR("ERROR FIFO FULL, aborting transfer\n");
>  		return -EINVAL;
>  	}
>  
> -	data_id = data_type | channel << 6;
> -
> -	r = (data_id << 0) | (data << 8) | (ecc << 24);
> +	r = pkg.header[3] << 24 | pkg.header[2] << 16 | pkg.header[1] << 8 |
> +	    pkg.header[0];

OK, this justifies using mipi_dsi_create_packet(), so you can skip the
related comments in earlier patches.

> -	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(channel), r);
> +	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(msg->channel), r);
>  
>  	return 0;
>  }
>  
>  static int dsi_vc_send_null(struct dsi_data *dsi, int channel)
>  {
> -	return dsi_vc_send_long(dsi, channel, MIPI_DSI_NULL_PACKET, NULL, 0, 0);
> +	const struct mipi_dsi_msg msg = {
> +		.channel = channel,
> +		.type = MIPI_DSI_NULL_PACKET,
> +	};
> +
> +	return dsi_vc_send_long(dsi, &msg);
>  }
>  
>  static int dsi_vc_write_common(struct omap_dss_device *dssdev,
>  			       const struct mipi_dsi_msg *msg)
>  {
>  	struct dsi_data *dsi = to_dsi_data(dssdev);
> -	struct mipi_dsi_packet packet;
>  	int r;
>  
> -	r = mipi_dsi_create_packet(&packet, msg);
> -	if (r < 0)
> -		return r;
> -
> -	if (mipi_dsi_packet_format_is_short(msg->type)) {
> -		u16 data = packet.header[1] | (packet.header[2] << 8);
> -		r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
> -	} else {
> -		r = dsi_vc_send_long(dsi, msg->channel, msg->type,
> -						   msg->tx_buf, msg->tx_len, 0);
> -	}
> +	if (mipi_dsi_packet_format_is_short(msg->type))
> +		r = dsi_vc_send_short(dsi, msg);
> +	else
> +		r = dsi_vc_send_long(dsi, msg);
>  
>  	if (r < 0)
>  		return r;
> @@ -2853,10 +2859,10 @@ static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
>  			   const struct mipi_dsi_msg *msg)
>  {
>  	struct dsi_data *dsi = to_dsi_data(dssdev);
> +	u8 cmd = ((u8*) msg->tx_buf)[0];
>  	int r;
> -	u8 dcs_cmd = ((u8*) msg->tx_buf)[0];
>  
> -	r = dsi_vc_send_short(dsi, msg->channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
> +	r = dsi_vc_send_short(dsi, msg);
>  	if (r)
>  		goto err;
>  
> @@ -2877,7 +2883,7 @@ static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
>  	return 0;
>  err:
>  	DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n",
> -		msg->channel, dcs_cmd);
> +		msg->channel, cmd);
>  	return r;
>  }
>  
> @@ -2885,17 +2891,9 @@ static int dsi_vc_generic_read(struct omap_dss_device *dssdev,
>  			       const struct mipi_dsi_msg *msg)
>  {
>  	struct dsi_data *dsi = to_dsi_data(dssdev);
> -	struct mipi_dsi_packet packet;
> -	u16 data;
>  	int r;
>  
> -	r = mipi_dsi_create_packet(&packet, msg);
> -	if (r < 0)
> -		goto err;
> -
> -	data = packet.header[1] | (packet.header[2] << 8);
> -
> -	r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
> +	r = dsi_vc_send_short(dsi, msg);
>  	if (r)
>  		goto err;
>
Sebastian Reichel Feb. 26, 2020, 11:34 p.m. UTC | #2 
Hi Laurent,

On Tue, Feb 25, 2020 at 06:30:01PM +0200, Laurent Pinchart wrote:
> On Tue, Feb 25, 2020 at 12:20:43AM +0100, Sebastian Reichel wrote:
> > Simplify the DSI encoder by using mipi_dsi_msg for
> > dsi_vc_send_long and dsi_vc_send_short. Further improvements
> > require cleaning up the channel allocation code first.
> > 
> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
> > ---
> >  drivers/gpu/drm/omapdrm/dss/dsi.c | 92 +++++++++++++++----------------
> >  1 file changed, 45 insertions(+), 47 deletions(-)
> > 
> > diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> > index 9b5b078beb6d..4899bfa2d76f 100644
> > --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> > +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> > @@ -2599,30 +2599,36 @@ static inline void dsi_vc_write_long_payload(struct dsi_data *dsi, int channel,
> >  	dsi_write_reg(dsi, DSI_VC_LONG_PACKET_PAYLOAD(channel), val);
> >  }
> >  
> > -static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
> > -			    const u8 *data, u16 len, u8 ecc)
> > +static int dsi_vc_send_long(struct dsi_data *dsi,
> > +			    const struct mipi_dsi_msg *msg)
> >  {
> > +	struct mipi_dsi_packet pkg;
> >  	/*u32 val; */
> >  	int i;
> >  	const u8 *p;
> >  	int r = 0;
> >  	u8 b1, b2, b3, b4;
> >  
> > +	r = mipi_dsi_create_packet(&pkg, msg);
> > +	if (r < 0)
> > +		return r;
> > +
> >  	if (dsi->debug_write)
> > -		DSSDBG("dsi_vc_send_long, %d bytes\n", len);
> > +		DSSDBG("dsi_vc_send_long, %d bytes\n", msg->tx_len);
> >  
> >  	/* len + header */
> > -	if (dsi->vc[channel].tx_fifo_size * 32 * 4 < len + 4) {
> > +	if (dsi->vc[msg->channel].tx_fifo_size * 32 * 4 < msg->tx_len + 4) {
> >  		DSSERR("unable to send long packet: packet too long.\n");
> >  		return -EINVAL;
> >  	}
> >  
> > -	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
> > +	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
> >  
> > -	dsi_vc_write_long_header(dsi, channel, data_type, len, ecc);
> > +	dsi_vc_write_long_header(dsi, msg->channel, msg->type, msg->tx_len,
> > +				 pkg.header[3]);
> 
> mipi_dsi_create_packet() never sets header[3]. I suppose that's not an
> issue as we were always passing ecc as 0 to this function, but you may
> want to drop mipi_dsi_create_packet() above and just hardcode 0 here.

sure.

> >  
> > -	p = data;
> > -	for (i = 0; i < len >> 2; i++) {
> > +	p = msg->tx_buf;
> > +	for (i = 0; i < msg->tx_len >> 2; i++) {
> >  		if (dsi->debug_write)
> >  			DSSDBG("\tsending full packet %d\n", i);
> >  
> > @@ -2631,10 +2637,10 @@ static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
> >  		b3 = *p++;
> >  		b4 = *p++;
> >  
> > -		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, b4);
> > +		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, b4);
> >  	}
> >  
> > -	i = len % 4;
> > +	i = msg->tx_len % 4;
> >  	if (i) {
> >  		b1 = 0; b2 = 0; b3 = 0;
> >  
> > @@ -2656,64 +2662,64 @@ static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
> >  			break;
> >  		}
> >  
> > -		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, 0);
> > +		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, 0);
> >  	}
> >  
> >  	return r;
> >  }
> >  
> > -static int dsi_vc_send_short(struct dsi_data *dsi, int channel, u8 data_type,
> > -			     u16 data, u8 ecc)
> > +static int dsi_vc_send_short(struct dsi_data *dsi,
> > +			     const struct mipi_dsi_msg *msg)
> >  {
> > +	struct mipi_dsi_packet pkg;
> 
> s/pkg/pkt/ (or packet)

Ack.

-- Sebastian

> >  	u32 r;
> > -	u8 data_id;
> > +
> > +	r = mipi_dsi_create_packet(&pkg, msg);
> > +	if (r < 0)
> > +		return r;
> >  
> >  	WARN_ON(!dsi_bus_is_locked(dsi));
> >  
> >  	if (dsi->debug_write)
> >  		DSSDBG("dsi_vc_send_short(ch%d, dt %#x, b1 %#x, b2 %#x)\n",
> > -				channel,
> > -				data_type, data & 0xff, (data >> 8) & 0xff);
> > +				msg->channel,
> > +				msg->type, pkg.header[1], pkg.header[2]);
> >  
> > -	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
> > +	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
> >  
> > -	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(channel)), 16, 16)) {
> > +	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(msg->channel)), 16, 16)) {
> >  		DSSERR("ERROR FIFO FULL, aborting transfer\n");
> >  		return -EINVAL;
> >  	}
> >  
> > -	data_id = data_type | channel << 6;
> > -
> > -	r = (data_id << 0) | (data << 8) | (ecc << 24);
> > +	r = pkg.header[3] << 24 | pkg.header[2] << 16 | pkg.header[1] << 8 |
> > +	    pkg.header[0];
> 
> OK, this justifies using mipi_dsi_create_packet(), so you can skip the
> related comments in earlier patches.
> 
> > -	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(channel), r);
> > +	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(msg->channel), r);
> >  
> >  	return 0;
> >  }
> >  
> >  static int dsi_vc_send_null(struct dsi_data *dsi, int channel)
> >  {
> > -	return dsi_vc_send_long(dsi, channel, MIPI_DSI_NULL_PACKET, NULL, 0, 0);
> > +	const struct mipi_dsi_msg msg = {
> > +		.channel = channel,
> > +		.type = MIPI_DSI_NULL_PACKET,
> > +	};
> > +
> > +	return dsi_vc_send_long(dsi, &msg);
> >  }
> >  
> >  static int dsi_vc_write_common(struct omap_dss_device *dssdev,
> >  			       const struct mipi_dsi_msg *msg)
> >  {
> >  	struct dsi_data *dsi = to_dsi_data(dssdev);
> > -	struct mipi_dsi_packet packet;
> >  	int r;
> >  
> > -	r = mipi_dsi_create_packet(&packet, msg);
> > -	if (r < 0)
> > -		return r;
> > -
> > -	if (mipi_dsi_packet_format_is_short(msg->type)) {
> > -		u16 data = packet.header[1] | (packet.header[2] << 8);
> > -		r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
> > -	} else {
> > -		r = dsi_vc_send_long(dsi, msg->channel, msg->type,
> > -						   msg->tx_buf, msg->tx_len, 0);
> > -	}
> > +	if (mipi_dsi_packet_format_is_short(msg->type))
> > +		r = dsi_vc_send_short(dsi, msg);
> > +	else
> > +		r = dsi_vc_send_long(dsi, msg);
> >  
> >  	if (r < 0)
> >  		return r;
> > @@ -2853,10 +2859,10 @@ static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
> >  			   const struct mipi_dsi_msg *msg)
> >  {
> >  	struct dsi_data *dsi = to_dsi_data(dssdev);
> > +	u8 cmd = ((u8*) msg->tx_buf)[0];
> >  	int r;
> > -	u8 dcs_cmd = ((u8*) msg->tx_buf)[0];
> >  
> > -	r = dsi_vc_send_short(dsi, msg->channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
> > +	r = dsi_vc_send_short(dsi, msg);
> >  	if (r)
> >  		goto err;
> >  
> > @@ -2877,7 +2883,7 @@ static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
> >  	return 0;
> >  err:
> >  	DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n",
> > -		msg->channel, dcs_cmd);
> > +		msg->channel, cmd);
> >  	return r;
> >  }
> >  
> > @@ -2885,17 +2891,9 @@ static int dsi_vc_generic_read(struct omap_dss_device *dssdev,
> >  			       const struct mipi_dsi_msg *msg)
> >  {
> >  	struct dsi_data *dsi = to_dsi_data(dssdev);
> > -	struct mipi_dsi_packet packet;
> > -	u16 data;
> >  	int r;
> >  
> > -	r = mipi_dsi_create_packet(&packet, msg);
> > -	if (r < 0)
> > -		goto err;
> > -
> > -	data = packet.header[1] | (packet.header[2] << 8);
> > -
> > -	r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
> > +	r = dsi_vc_send_short(dsi, msg);
> >  	if (r)
> >  		goto err;
> >  
> 
> -- 
> Regards,
> 
> Laurent Pinchart
diff mbox series

Patch

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 9b5b078beb6d..4899bfa2d76f 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2599,30 +2599,36 @@  static inline void dsi_vc_write_long_payload(struct dsi_data *dsi, int channel,
 	dsi_write_reg(dsi, DSI_VC_LONG_PACKET_PAYLOAD(channel), val);
 }
 
-static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
-			    const u8 *data, u16 len, u8 ecc)
+static int dsi_vc_send_long(struct dsi_data *dsi,
+			    const struct mipi_dsi_msg *msg)
 {
+	struct mipi_dsi_packet pkg;
 	/*u32 val; */
 	int i;
 	const u8 *p;
 	int r = 0;
 	u8 b1, b2, b3, b4;
 
+	r = mipi_dsi_create_packet(&pkg, msg);
+	if (r < 0)
+		return r;
+
 	if (dsi->debug_write)
-		DSSDBG("dsi_vc_send_long, %d bytes\n", len);
+		DSSDBG("dsi_vc_send_long, %d bytes\n", msg->tx_len);
 
 	/* len + header */
-	if (dsi->vc[channel].tx_fifo_size * 32 * 4 < len + 4) {
+	if (dsi->vc[msg->channel].tx_fifo_size * 32 * 4 < msg->tx_len + 4) {
 		DSSERR("unable to send long packet: packet too long.\n");
 		return -EINVAL;
 	}
 
-	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
+	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
 
-	dsi_vc_write_long_header(dsi, channel, data_type, len, ecc);
+	dsi_vc_write_long_header(dsi, msg->channel, msg->type, msg->tx_len,
+				 pkg.header[3]);
 
-	p = data;
-	for (i = 0; i < len >> 2; i++) {
+	p = msg->tx_buf;
+	for (i = 0; i < msg->tx_len >> 2; i++) {
 		if (dsi->debug_write)
 			DSSDBG("\tsending full packet %d\n", i);
 
@@ -2631,10 +2637,10 @@  static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
 		b3 = *p++;
 		b4 = *p++;
 
-		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, b4);
+		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, b4);
 	}
 
-	i = len % 4;
+	i = msg->tx_len % 4;
 	if (i) {
 		b1 = 0; b2 = 0; b3 = 0;
 
@@ -2656,64 +2662,64 @@  static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
 			break;
 		}
 
-		dsi_vc_write_long_payload(dsi, channel, b1, b2, b3, 0);
+		dsi_vc_write_long_payload(dsi, msg->channel, b1, b2, b3, 0);
 	}
 
 	return r;
 }
 
-static int dsi_vc_send_short(struct dsi_data *dsi, int channel, u8 data_type,
-			     u16 data, u8 ecc)
+static int dsi_vc_send_short(struct dsi_data *dsi,
+			     const struct mipi_dsi_msg *msg)
 {
+	struct mipi_dsi_packet pkg;
 	u32 r;
-	u8 data_id;
+
+	r = mipi_dsi_create_packet(&pkg, msg);
+	if (r < 0)
+		return r;
 
 	WARN_ON(!dsi_bus_is_locked(dsi));
 
 	if (dsi->debug_write)
 		DSSDBG("dsi_vc_send_short(ch%d, dt %#x, b1 %#x, b2 %#x)\n",
-				channel,
-				data_type, data & 0xff, (data >> 8) & 0xff);
+				msg->channel,
+				msg->type, pkg.header[1], pkg.header[2]);
 
-	dsi_vc_config_source(dsi, channel, DSI_VC_SOURCE_L4);
+	dsi_vc_config_source(dsi, msg->channel, DSI_VC_SOURCE_L4);
 
-	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(channel)), 16, 16)) {
+	if (FLD_GET(dsi_read_reg(dsi, DSI_VC_CTRL(msg->channel)), 16, 16)) {
 		DSSERR("ERROR FIFO FULL, aborting transfer\n");
 		return -EINVAL;
 	}
 
-	data_id = data_type | channel << 6;
-
-	r = (data_id << 0) | (data << 8) | (ecc << 24);
+	r = pkg.header[3] << 24 | pkg.header[2] << 16 | pkg.header[1] << 8 |
+	    pkg.header[0];
 
-	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(channel), r);
+	dsi_write_reg(dsi, DSI_VC_SHORT_PACKET_HEADER(msg->channel), r);
 
 	return 0;
 }
 
 static int dsi_vc_send_null(struct dsi_data *dsi, int channel)
 {
-	return dsi_vc_send_long(dsi, channel, MIPI_DSI_NULL_PACKET, NULL, 0, 0);
+	const struct mipi_dsi_msg msg = {
+		.channel = channel,
+		.type = MIPI_DSI_NULL_PACKET,
+	};
+
+	return dsi_vc_send_long(dsi, &msg);
 }
 
 static int dsi_vc_write_common(struct omap_dss_device *dssdev,
 			       const struct mipi_dsi_msg *msg)
 {
 	struct dsi_data *dsi = to_dsi_data(dssdev);
-	struct mipi_dsi_packet packet;
 	int r;
 
-	r = mipi_dsi_create_packet(&packet, msg);
-	if (r < 0)
-		return r;
-
-	if (mipi_dsi_packet_format_is_short(msg->type)) {
-		u16 data = packet.header[1] | (packet.header[2] << 8);
-		r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
-	} else {
-		r = dsi_vc_send_long(dsi, msg->channel, msg->type,
-						   msg->tx_buf, msg->tx_len, 0);
-	}
+	if (mipi_dsi_packet_format_is_short(msg->type))
+		r = dsi_vc_send_short(dsi, msg);
+	else
+		r = dsi_vc_send_long(dsi, msg);
 
 	if (r < 0)
 		return r;
@@ -2853,10 +2859,10 @@  static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
 			   const struct mipi_dsi_msg *msg)
 {
 	struct dsi_data *dsi = to_dsi_data(dssdev);
+	u8 cmd = ((u8*) msg->tx_buf)[0];
 	int r;
-	u8 dcs_cmd = ((u8*) msg->tx_buf)[0];
 
-	r = dsi_vc_send_short(dsi, msg->channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
+	r = dsi_vc_send_short(dsi, msg);
 	if (r)
 		goto err;
 
@@ -2877,7 +2883,7 @@  static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,
 	return 0;
 err:
 	DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n",
-		msg->channel, dcs_cmd);
+		msg->channel, cmd);
 	return r;
 }
 
@@ -2885,17 +2891,9 @@  static int dsi_vc_generic_read(struct omap_dss_device *dssdev,
 			       const struct mipi_dsi_msg *msg)
 {
 	struct dsi_data *dsi = to_dsi_data(dssdev);
-	struct mipi_dsi_packet packet;
-	u16 data;
 	int r;
 
-	r = mipi_dsi_create_packet(&packet, msg);
-	if (r < 0)
-		goto err;
-
-	data = packet.header[1] | (packet.header[2] << 8);
-
-	r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
+	r = dsi_vc_send_short(dsi, msg);
 	if (r)
 		goto err;