Hi Sebastian,
Thank you for the patch.
On Tue, Feb 25, 2020 at 12:20:42AM +0100, Sebastian Reichel wrote:
> Simplify the read related message handling by using the functionality
> provided by CONFIG_DRM_MIPI_DSI.
>
> Signed-off-by: Sebastian Reichel <sebastian.reic...@collabora.com>
> ---
> drivers/gpu/drm/omapdrm/dss/dsi.c | 109 +++++++++---------------------
> 1 file changed, 33 insertions(+), 76 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c
> b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index e5589e615808..9b5b078beb6d 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -2741,60 +2741,6 @@ static int dsi_vc_write_common(struct omap_dss_device
> *dssdev,
> return 0;
> }
>
> -static int dsi_vc_dcs_send_read_request(struct dsi_data *dsi, int channel,
> - u8 dcs_cmd)
> -{
> - int r;
> -
> - if (dsi->debug_read)
> - DSSDBG("dsi_vc_dcs_send_read_request(ch%d, dcs_cmd %x)\n",
> - channel, dcs_cmd);
> -
Do you plan to drop debug_read ? I don't really mind, but it can have
its uses. If this wasn't done on purpose, you may want to move those
messages to dsi_vc_dcs_read() and dsi_vc_generic_read().
> - r = dsi_vc_send_short(dsi, 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_generic_send_read_request(struct dsi_data *dsi, int
> channel,
> - const u8 *reqdata, int reqlen)
> -{
> - u16 data;
> - u8 data_type;
> - int r;
> -
> - if (dsi->debug_read)
> - DSSDBG("dsi_vc_generic_send_read_request(ch %d, reqlen %d)\n",
> - channel, reqlen);
> -
> - if (reqlen == 0) {
> - data_type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
> - data = 0;
> - } else if (reqlen == 1) {
> - data_type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
> - data = reqdata[0];
> - } else if (reqlen == 2) {
> - data_type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
> - data = reqdata[0] | (reqdata[1] << 8);
> - } else {
> - BUG();
> - return -EINVAL;
> - }
> -
> - r = dsi_vc_send_short(dsi, channel, data_type, data, 0);
> - if (r) {
> - DSSERR("dsi_vc_generic_send_read_request(ch %d, reqlen %d)"
> - " failed\n", channel, reqlen);
> - return r;
> - }
> -
> - return 0;
> -}
> -
> static int dsi_vc_read_rx_fifo(struct dsi_data *dsi, int channel, u8 *buf,
> int buflen, enum dss_dsi_content_type type)
> {
> @@ -2903,61 +2849,75 @@ static int dsi_vc_read_rx_fifo(struct dsi_data *dsi,
> int channel, u8 *buf,
> return r;
> }
>
> -static int dsi_vc_dcs_read(struct omap_dss_device *dssdev, int channel, u8
> dcs_cmd,
> - u8 *buf, int buflen)
> +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);
> int r;
> + u8 dcs_cmd = ((u8*) msg->tx_buf)[0];
Nitpicking, dcs_cmd before r ?
>
> - r = dsi_vc_dcs_send_read_request(dsi, channel, dcs_cmd);
> + r = dsi_vc_send_short(dsi, msg->channel, MIPI_DSI_DCS_READ, dcs_cmd, 0);
> if (r)
> goto err;
>
> - r = dsi_vc_send_bta_sync(dssdev, channel);
> + r = dsi_vc_send_bta_sync(dssdev, msg->channel);
> if (r)
> goto err;
>
> - r = dsi_vc_read_rx_fifo(dsi, channel, buf, buflen,
> + r = dsi_vc_read_rx_fifo(dsi, msg->channel, msg->rx_buf, msg->rx_len,
> DSS_DSI_CONTENT_DCS);
> if (r < 0)
> goto err;
>
> - if (r != buflen) {
> + if (r != msg->rx_len) {
> r = -EIO;
> goto err;
> }
>
> return 0;
> err:
> - DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n", channel, dcs_cmd);
> + DSSERR("dsi_vc_dcs_read(ch %d, cmd 0x%02x) failed\n",
> + msg->channel, dcs_cmd);
> return r;
> }
>
> -static int dsi_vc_generic_read(struct omap_dss_device *dssdev, int channel,
> - const u8 *reqdata, int reqlen, u8 *buf, int buflen)
> +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 = dsi_vc_generic_send_read_request(dsi, channel, reqdata, reqlen);
> + r = mipi_dsi_create_packet(&packet, msg);
> + if (r < 0)
> + goto err;
> +
> + data = packet.header[1] | (packet.header[2] << 8);
As with the previous patch, I think you can compute data manually if the
only use of the packet structure is to get this information.
> +
> + r = dsi_vc_send_short(dsi, msg->channel, msg->type, data, 0);
> if (r)
> - return r;
> + goto err;
>
> - r = dsi_vc_send_bta_sync(dssdev, channel);
> + r = dsi_vc_send_bta_sync(dssdev, msg->channel);
> if (r)
> - return r;
> + goto err;
>
> - r = dsi_vc_read_rx_fifo(dsi, channel, buf, buflen,
> + r = dsi_vc_read_rx_fifo(dsi, msg->channel, msg->rx_buf, msg->rx_len,
> DSS_DSI_CONTENT_GENERIC);
> if (r < 0)
> - return r;
> + goto err;
>
> - if (r != buflen) {
> + if (r != msg->rx_len) {
> r = -EIO;
> - return r;
> + goto err;
> }
>
> return 0;
> +err:
> + DSSERR("dsi_vc_generic_read(ch %d, reqlen %d) failed\n",
> + msg->channel, msg->tx_len);
> + return r;
> }
>
> static int dsi_enter_ulps(struct dsi_data *dsi)
> @@ -4768,12 +4728,9 @@ static ssize_t omap_dsi_transfer(struct
> omap_dss_device *dssdev,
> case MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM:
> case MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM:
> case MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM:
> - return dsi_vc_generic_read(dssdev, msg->channel, msg->tx_buf,
> - msg->tx_len, msg->rx_buf, msg->rx_len);
> + return dsi_vc_generic_read(dssdev, msg);
> case MIPI_DSI_DCS_READ:
> - return dsi_vc_dcs_read(dssdev, msg->channel,
> - ((u8*) msg->tx_buf)[0],
> - msg->rx_buf, msg->rx_len);
> + return dsi_vc_dcs_read(dssdev, msg);
> }
>
> return -EINVAL;
--
Regards,
Laurent Pinchart
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