greybus: camera: Hardcode the APB-A CSI-2 TX parameters

Camera modules will stop reporting the number of lines per second,
hardcode the parameter in the driver until the APB-A CSI-2 TX
configuration protocol gets updated as well to use a more appropriate
form of bandwidth information.

The number of data lanes is also hardcoded as it should not depend on
the module's CSI-2 bus configuration.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/camera.c b/drivers/staging/greybus/camera.c
index 9d9746f..ceffe14 100644 (file)
--- a/drivers/staging/greybus/camera.c
+++ b/drivers/staging/greybus/camera.c
@@ -277,6 +277,13 @@ struct ap_csi_config_request {
        __le32 lines_per_second;
 } __packed;
 
+/*
+ * TODO: Compute the number of lanes dynamically based on bandwidth
+ * requirements.
+ */
+#define GB_CAMERA_CSI_NUM_DATA_LANES           4
+#define GB_CAMERA_LINES_PER_SECOND             (1280 * 30)
+
 static int gb_camera_setup_data_connection(struct gb_camera *gcam,
                const struct gb_camera_configure_streams_response *resp,
                struct gb_camera_csi_params *csi_params)
@@ -308,8 +315,8 @@ static int gb_camera_setup_data_connection(struct gb_camera *gcam,
                goto error_conn_disable;
 
        /*
-        * Configure the APB1 CSI transmitter using the lines count reported by
-        * the  camera module, but with hard-coded bus frequency and lanes number.
+        * Configure the APB1 CSI transmitter with hard-coded bus frequency,
+        * lanes number and lines per second.
         *
         * TODO: use the clocking and size informations reported by camera module
         * to compute the required CSI bandwidth, and configure the CSI receiver
@@ -318,9 +325,9 @@ static int gb_camera_setup_data_connection(struct gb_camera *gcam,
        memset(&csi_cfg, 0, sizeof(csi_cfg));
        csi_cfg.csi_id = 1;
        csi_cfg.flags = 0;
-       csi_cfg.num_lanes = resp->num_lanes;
+       csi_cfg.num_lanes = GB_CAMERA_CSI_NUM_DATA_LANES;
        csi_cfg.bus_freq = cpu_to_le32(960000000);
-       csi_cfg.lines_per_second = resp->lines_per_second;
+       csi_cfg.lines_per_second = GB_CAMERA_LINES_PER_SECOND;
 
        ret = gb_hd_output(gcam->connection->hd, &csi_cfg,
                           sizeof(csi_cfg),
@@ -335,7 +342,6 @@ static int gb_camera_setup_data_connection(struct gb_camera *gcam,
                csi_params->num_lanes = csi_cfg.num_lanes;
                /* Transmitting two bits per cycle. (DDR clock) */
                csi_params->clk_freq = csi_cfg.bus_freq / 2;
-               csi_params->lines_per_second = csi_cfg.lines_per_second;
        }
 
        return 0;