diff options
| author |   YoungJun Cho <yj44.cho@samsung.com> | 2014-08-05 09:27:15 +0200 |
|---|---|---|
| committer |   Thierry Reding <treding@nvidia.com> | 2014-11-13 13:55:44 +0100 |
| commit | dbf30b695809b88fd650dab4028156fb85c5f2d9 (patch) | |
| tree | a54bd01563191ac5b681fe64676ae94bba2ab98a | |
| parent | drm/dsi: Constify mipi_dsi_msg (diff) | |
| download | wireguard-linux-dbf30b695809b88fd650dab4028156fb85c5f2d9.tar.xz wireguard-linux-dbf30b695809b88fd650dab4028156fb85c5f2d9.zip | |
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: YoungJun Cho <yj44.cho@samsung.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
[treding: endianess, kerneldoc, return value]
Signed-off-by: Thierry Reding <treding@nvidia.com>
| -rw-r--r-- | drivers/gpu/drm/drm_mipi_dsi.c | 24 | ||||
| -rw-r--r-- | include/drm/drm_mipi_dsi.h | 2 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 388c3ab02500..60177a3e16be 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -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 diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 4eeb4a5ead8b..4a4e9d7ccc16 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -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, |