* Tomi Valkeinen <tomi.valkeinen@xxxxxxxxx> [090805 17:19]:
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxxxxx>
> ---
> drivers/video/omap2/dss/dsi.c | 3509 +++++++++++++++++++++++++++++++++++++++++
> 1 files changed, 3509 insertions(+), 0 deletions(-)
> create mode 100644 drivers/video/omap2/dss/dsi.c
>
> diff --git a/drivers/video/omap2/dss/dsi.c b/drivers/video/omap2/dss/dsi.c
<snip snip>
> +int dsi_vc_dcs_read(int channel, u8 dcs_cmd, u8 *buf, int buflen)
> +{
> + u32 val;
> + u8 dt;
> + int r;
> +
> + if (dsi.debug_read)
> + DSSDBG("dsi_vc_dcs_read(ch%d, dcs_cmd %u)\n", channel, dcs_cmd);
> +
> + r = dsi_vc_send_short(channel, DSI_DT_DCS_READ, dcs_cmd, 0);
> + if (r)
> + return r;
> +
> + r = dsi_vc_send_bta_sync(channel);
> + if (r)
> + return r;
> +
> + /* RX_FIFO_NOT_EMPTY */
> + if (REG_GET(DSI_VC_CTRL(channel), 20, 20) == 0) {
> + DSSERR("RX fifo empty when trying to read.\n");
> + return -EIO;
> + }
> +
> + val = dsi_read_reg(DSI_VC_SHORT_PACKET_HEADER(channel));
> + if (dsi.debug_read)
> + DSSDBG("\theader: %08x\n", val);
> + dt = FLD_GET(val, 5, 0);
> + if (dt == DSI_DT_RX_ACK_WITH_ERR) {
> + u16 err = FLD_GET(val, 23, 8);
> + dsi_show_rx_ack_with_err(err);
> + return -1;
Return something from err.h instead of -1 in various places in this function?
> +
> + } else if (dt == DSI_DT_RX_SHORT_READ_1) {
> + u8 data = FLD_GET(val, 15, 8);
> + if (dsi.debug_read)
> + DSSDBG("\tDCS short response, 1 byte: %02x\n", data);
> +
> + if (buflen < 1)
> + return -1;
> +
> + buf[0] = data;
> +
> + return 1;
> + } else if (dt == DSI_DT_RX_SHORT_READ_2) {
> + u16 data = FLD_GET(val, 23, 8);
> + if (dsi.debug_read)
> + DSSDBG("\tDCS short response, 2 byte: %04x\n", data);
> +
> + if (buflen < 2)
> + return -1;
> +
> + buf[0] = data & 0xff;
> + buf[1] = (data >> 8) & 0xff;
> +
> + return 2;
> + } else if (dt == DSI_DT_RX_DCS_LONG_READ) {
> + int w;
> + int len = FLD_GET(val, 23, 8);
> + if (dsi.debug_read)
> + DSSDBG("\tDCS long response, len %d\n", len);
> +
> + if (len > buflen)
> + return -1;
> +
> + /* two byte checksum ends the packet, not included in len */
> + for (w = 0; w < len + 2;) {
> + int b;
> + val = dsi_read_reg(DSI_VC_SHORT_PACKET_HEADER(channel));
> + if (dsi.debug_read)
> + DSSDBG("\t\t%02x %02x %02x %02x\n",
> + (val >> 0) & 0xff,
> + (val >> 8) & 0xff,
> + (val >> 16) & 0xff,
> + (val >> 24) & 0xff);
> +
> + for (b = 0; b < 4; ++b) {
> + if (w < len)
> + buf[w] = (val >> (b * 8)) & 0xff;
> + /* we discard the 2 byte checksum */
> + ++w;
> + }
> + }
> +
> + return len;
> +
> + } else {
> + DSSERR("\tunknown datatype 0x%02x\n", dt);
> + return -1;
> + }
> +}
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