2 files changed, 95 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index 60177a3e16be..dcc15e161816 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -357,6 +357,95 @@ int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
 EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
 
 /**
+ * mipi_dsi_generic_write() - transmit data using a generic write packet
+ * @dsi: DSI peripheral device
+ * @payload: buffer containing the payload
+ * @size: size of payload buffer
+ *
+ * This function will automatically choose the right data type depending on
+ * the payload length.
+ *
+ * Return: The number of bytes transmitted on success or a negative error code
+ * on failure.
+ */
+ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
+                               size_t size)
+{
+        struct mipi_dsi_msg msg = {
+                .channel = dsi->channel,
+                .tx_buf = payload,
+                .tx_len = size
+        };
+
+        switch (size) {
+        case 0:
+                msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM;
+                break;
+
+        case 1:
+                msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM;
+                break;
+
+        case 2:
+                msg.type = MIPI_DSI_GENERIC_SHORT_WRITE_2_PARAM;
+                break;
+
+        default:
+                msg.type = MIPI_DSI_GENERIC_LONG_WRITE;
+                break;
+        }
+
+        return mipi_dsi_device_transfer(dsi, &msg);
+}
+EXPORT_SYMBOL(mipi_dsi_generic_write);
+
+/**
+ * mipi_dsi_generic_read() - receive data using a generic read packet
+ * @dsi: DSI peripheral device
+ * @params: buffer containing the request parameters
+ * @num_params: number of request parameters
+ * @data: buffer in which to return the received data
+ * @size: size of receive buffer
+ *
+ * This function will automatically choose the right data type depending on
+ * the number of parameters passed in.
+ *
+ * Return: The number of bytes successfully read or a negative error code on
+ * failure.
+ */
+ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
+                              size_t num_params, void *data, size_t size)
+{
+        struct mipi_dsi_msg msg = {
+                .channel = dsi->channel,
+                .tx_len = num_params,
+                .tx_buf = params,
+                .rx_len = size,
+                .rx_buf = data
+        };
+
+        switch (num_params) {
+        case 0:
+                msg.type = MIPI_DSI_GENERIC_READ_REQUEST_0_PARAM;
+                break;
+
+        case 1:
+                msg.type = MIPI_DSI_GENERIC_READ_REQUEST_1_PARAM;
+                break;
+
+        case 2:
+                msg.type = MIPI_DSI_GENERIC_READ_REQUEST_2_PARAM;
+                break;
+
+        default:
+                return -EINVAL;
+        }
+
+        return mipi_dsi_device_transfer(dsi, &msg);
+}
+EXPORT_SYMBOL(mipi_dsi_generic_read);
+
+/**
  * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
  * @dsi: DSI peripheral device
  * @data: buffer containing data to be transmitted
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 4a4e9d7ccc16..524655509cf1 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -155,6 +155,12 @@ int mipi_dsi_attach(struct mipi_dsi_device *dsi);
 int mipi_dsi_detach(struct mipi_dsi_device *dsi);
 int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
                                             u16 value);
+
+ssize_t mipi_dsi_generic_write(struct mipi_dsi_device *dsi, const void *payload,
+                               size_t size);
+ssize_t mipi_dsi_generic_read(struct mipi_dsi_device *dsi, const void *params,
+                              size_t num_params, void *data, size_t size);
+
 ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi,
                                   const void *data, size_t len);
 ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd,