From: YoungJun Cho <yj44.cho@xxxxxxxxxxx>
This function can be used to set the maximum return packet size for a
MIPI DSI peripheral.
Signed-off-by: YoungJun Cho <yj44.cho@xxxxxxxxxxx>
[treding: endianess, kerneldoc, return value]
Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
---
Changes in v4:
- use C99 initializer
Changes in v3:
- use common helper to simplify code
drivers/gpu/drm/drm_mipi_dsi.c | 24 ++++++++++++++++++++++++
include/drm/drm_mipi_dsi.h | 2 ++
2 files changed, 26 insertions(+)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c
index aa1aab24181c..640cabcd6c1f 100644
--- a/drivers/gpu/drm/drm_mipi_dsi.c
+++ b/drivers/gpu/drm/drm_mipi_dsi.c
@@ -257,6 +257,30 @@ int mipi_dsi_create_packet(struct mipi_dsi_packet *packet,
}
EXPORT_SYMBOL(mipi_dsi_create_packet);
+/*
+ * mipi_dsi_set_maximum_return_packet_size() - specify the maximum size of the
+ * the payload in a long packet transmitted from the peripheral back to the
+ * host processor
+ * @dsi: DSI peripheral device
+ * @value: the maximum size of the payload
+ *
+ * Return: 0 on success or a negative error code on failure.
+ */
+int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi,
+ u16 value)
+{
+ u8 tx[2] = { value & 0xff, value >> 8 };
+ struct mipi_dsi_msg msg = {
+ .channel = dsi->channel,
+ .type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE,
+ .tx_len = sizeof(tx),
+ .tx_buf = tx,
+ };
+
+ return mipi_dsi_device_transfer(dsi, &msg);
+}
+EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size);
+
/**
* mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload
* @dsi: DSI peripheral device
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h
index 6600cf630585..bab67099872b 100644
--- a/include/drm/drm_mipi_dsi.h
+++ b/include/drm/drm_mipi_dsi.h
@@ -150,6 +150,8 @@ static inline struct mipi_dsi_device *to_mipi_dsi_device(struct device *dev)
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_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,
--
2.1.2
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel
