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-rw-r--r--Documentation/DocBook/drm.tmpl6
-rw-r--r--drivers/gpu/drm/drm_mipi_dsi.c18
-rw-r--r--include/drm/drm_mipi_dsi.h16
3 files changed, 36 insertions, 4 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index be35bc328b77..da733c28c92f 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -2343,6 +2343,12 @@ void intel_crt_init(struct drm_device *dev)
!Edrivers/gpu/drm/drm_dp_mst_topology.c
</sect2>
<sect2>
+ <title>MIPI DSI Helper Functions Reference</title>
+!Pdrivers/gpu/drm/drm_mipi_dsi.c dsi helpers
+!Iinclude/drm/drm_mipi_dsi.h
+!Edrivers/gpu/drm/drm_mipi_dsi.c
+ </sect2>
+ <sect2>
<title>EDID Helper Functions Reference</title>
!Edrivers/gpu/drm/drm_edid.c
</sect2>
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index c7cc8fa23b58..431e96f19288 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -35,6 +35,16 @@
#include <video/mipi_display.h>
+/**
+ * DOC: dsi helpers
+ *
+ * These functions contain some common logic and helpers to deal with MIPI DSI
+ * peripherals.
+ *
+ * Helpers are provided for a number of standard MIPI DSI command as well as a
+ * subset of the MIPI DCS command set.
+ */
+
static int mipi_dsi_device_match(struct device *dev, struct device_driver *drv)
{
return of_driver_match_device(dev, drv);
@@ -699,8 +709,10 @@ static void mipi_dsi_drv_shutdown(struct device *dev)
}
/**
- * mipi_dsi_driver_register - register a driver for DSI devices
+ * mipi_dsi_driver_register() - register a driver for DSI devices
* @drv: DSI driver structure
+ *
+ * Return: 0 on success or a negative error code on failure.
*/
int mipi_dsi_driver_register(struct mipi_dsi_driver *drv)
{
@@ -717,8 +729,10 @@ int mipi_dsi_driver_register(struct mipi_dsi_driver *drv)
EXPORT_SYMBOL(mipi_dsi_driver_register);
/**
- * mipi_dsi_driver_unregister - unregister a driver for DSI devices
+ * mipi_dsi_driver_unregister() - unregister a driver for DSI devices
* @drv: DSI driver structure
+ *
+ * Return: 0 on success or a negative error code on failure.
*/
void mipi_dsi_driver_unregister(struct mipi_dsi_driver *drv)
{
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index b2106ad2dd7f..31678cecd891 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -26,6 +26,7 @@ struct mipi_dsi_device;
* struct mipi_dsi_msg - read/write DSI buffer
* @channel: virtual channel id
* @type: payload data type
+ * @flags: flags controlling this message transmission
* @tx_len: length of @tx_buf
* @tx_buf: data to be written
* @rx_len: length of @rx_buf
@@ -68,8 +69,19 @@ int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
* struct mipi_dsi_host_ops - DSI bus operations
* @attach: attach DSI device to DSI host
* @detach: detach DSI device from DSI host
- * @transfer: send and/or receive DSI packet, return number of received bytes,
- * or error
+ * @transfer: transmit a DSI packet
+ *
+ * DSI packets transmitted by .transfer() are passed in as mipi_dsi_msg
+ * structures. This structure contains information about the type of packet
+ * being transmitted as well as the transmit and receive buffers. When an
+ * error is encountered during transmission, this function will return a
+ * negative error code. On success it shall return the number of bytes
+ * transmitted for write packets or the number of bytes received for read
+ * packets.
+ *
+ * Note that typically DSI packet transmission is atomic, so the .transfer()
+ * function will seldomly return anything other than the number of bytes
+ * contained in the transmit buffer on success.
*/
struct mipi_dsi_host_ops {
int (*attach)(struct mipi_dsi_host *host,