[PATCH v3 12/56] drm/omap: dsi: switch dsi_vc_send_long/short to mipi_dsi_msg

Tomi Valkeinen
2020-11-05T12:04:36Z

From: Sebastian Reichel <sebastian.reichel@collabora.com>

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>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
---
drivers/gpu/drm/omapdrm/dss/dsi.c | 89 ++++++++++++++-----------------
1 file changed, 40 insertions(+), 49 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index bbdc52ee3559..6fa7833e32ad 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -2599,8 +2599,8 @@ 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)
{
/*u32 val; */
int i;
@@ -2609,20 +2609,20 @@ static int dsi_vc_send_long(struct dsi_data *dsi, int channel, u8 data_type,
u8 b1, b2, b3, b4;

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, 0);

- 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 +2631,10 @@ 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;

@@ -2656,65 +2656,64 @@ 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 pkt;
u32 r;
- u8 data_id;
+
+ r = mipi_dsi_create_packet(&pkt, 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, pkt.header[1], pkt.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 = pkt.header[3] << 24 | pkt.header[2] << 16 | pkt.header[1] << 8 |
+ pkt.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;
@@ -2854,14 +2853,14 @@ 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 dcs_cmd = ((u8 *)msg->tx_buf)[0];
+ u8 cmd = ((u8 *)msg->tx_buf)[0];
u8 channel = msg->channel;
int r;

if (dsi->debug_read)
- DSSDBG("%s(ch %d, cmd %x)\n", __func__, channel, dcs_cmd);
+ DSSDBG("%s(ch %d, cmd %x)\n", __func__, channel, cmd);

- r = dsi_vc_send_short(dsi, channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
+ r = dsi_vc_send_short(dsi, msg);
if (r)
goto err;

@@ -2881,7 +2880,7 @@ static int dsi_vc_dcs_read(struct omap_dss_device *dssdev,

return 0;
err:
- DSSERR("%s(ch %d, cmd 0x%02x) failed\n", __func__, msg->channel, dcs_cmd);
+ DSSERR("%s(ch %d, cmd 0x%02x) failed\n", __func__, msg->channel, cmd);
return r;
}

@@ -2889,17 +2888,9 @@ 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;