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Commit dbf30b69 authored by YoungJun Cho's avatar YoungJun Cho Committed by Thierry Reding
Browse files

drm/dsi: Add mipi_dsi_set_maximum_return_packet_size() helper 



This function can be used to set the maximum return packet size for a
MIPI DSI peripheral.

Signed-off-by: default avatarYoungJun Cho <yj44.cho@samsung.com>
Reviewed-by: default avatarSean Paul <seanpaul@chromium.org>
[treding: endianess, kerneldoc, return value]
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
parent ed6ff40e

drivers/gpu/drm/drm_mipi_dsi.c

+24 −0
Original line number Diff line number Diff line
@@ -332,6 +332,30 @@ 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

include/drm/drm_mipi_dsi.h

+2 −0
Original line number Diff line number Diff line
@@ -153,6 +153,8 @@ 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,