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OMAP: DSS2: DSI: Split dsi_vc_dcs_read() into 2 functions

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Split dsi_vc_dcs_read() into the functions:
- dsi_vc_dcs_send_read_request(): This is responsible for sending the short
packet command with the read request.
- dsi_vc_dcs_read_rx_fifo(): This parses the DSI RX fifo of the given virtual
channel, identifies the type of data received, and fills a buffer with the data
provided by the panel.

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Archit Taneja 2011-08-30 15:48:23 +05:30 committed by Tomi Valkeinen
parent 5c716a04ed
commit b850975cd8
1 changed files with 53 additions and 16 deletions
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69
drivers/video/omap2/dss/dsi.c
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@ -3196,26 +3196,35 @@ int dsi_vc_generic_write_2(struct omap_dss_device *dssdev, int channel,
}
EXPORT_SYMBOL(dsi_vc_generic_write_2);
int dsi_vc_dcs_read(struct omap_dss_device *dssdev, int channel, u8 dcs_cmd,
u8 *buf, int buflen)
static int dsi_vc_dcs_send_read_request(struct omap_dss_device *dssdev,
int channel, u8 dcs_cmd)
{
struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
int r;
if (dsi->debug_read)
DSSDBG("dsi_vc_dcs_send_read_request(ch%d, dcs_cmd %x)\n",
channel, dcs_cmd);
r = dsi_vc_send_short(dsidev, channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
if (r) {
DSSERR("dsi_vc_dcs_send_read_request(ch %d, cmd 0x%02x)"
" failed\n", channel, dcs_cmd);
return r;
}
return 0;
}
static int dsi_vc_dcs_read_rx_fifo(struct platform_device *dsidev, int channel,
u8 *buf, int buflen)
{
struct dsi_data *dsi = dsi_get_dsidrv_data(dsidev);
u32 val;
u8 dt;
int r;
if (dsi->debug_read)
DSSDBG("dsi_vc_dcs_read(ch%d, dcs_cmd %x)\n", channel, dcs_cmd);
r = dsi_vc_send_short(dsidev, channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
if (r)
goto err;
r = dsi_vc_send_bta_sync(dssdev, channel);
if (r)
goto err;
/* RX_FIFO_NOT_EMPTY */
if (REG_GET(dsidev, DSI_VC_CTRL(channel), 20, 20) == 0) {
DSSERR("RX fifo empty when trying to read.\n");
@ -3300,10 +3309,38 @@ int dsi_vc_dcs_read(struct omap_dss_device *dssdev, int channel, u8 dcs_cmd,
BUG();
err:
DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n",
channel, dcs_cmd);
return r;
DSSERR("dsi_vc_dcs_read_rx_fifo(ch %d) failed\n", channel);
return r;
}
int dsi_vc_dcs_read(struct omap_dss_device *dssdev, int channel, u8 dcs_cmd,
u8 *buf, int buflen)
{
struct platform_device *dsidev = dsi_get_dsidev_from_dssdev(dssdev);
int r;
r = dsi_vc_dcs_send_read_request(dssdev, channel, dcs_cmd);
if (r)
goto err;
r = dsi_vc_send_bta_sync(dssdev, channel);
if (r)
goto err;
r = dsi_vc_dcs_read_rx_fifo(dsidev, channel, buf, buflen);
if (r < 0)
goto err;
if (r != buflen) {
r = -EIO;
goto err;
}
return 0;
err:
DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n", channel, dcs_cmd);
return r;
}
EXPORT_SYMBOL(dsi_vc_dcs_read);