diff options
| -rw-r--r-- | drivers/gpu/drm/drm_mipi_dsi.c | 77 | ||||
| -rw-r--r-- | drivers/gpu/drm/panel/panel-s6e8aa0.c | 2 | ||||
| -rw-r--r-- | include/drm/drm_mipi_dsi.h | 6 |
3 files changed, 70 insertions, 15 deletions
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 0cc030a09c56..388c3ab02500 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -333,13 +333,19 @@ int mipi_dsi_create_packet(struct mipi_dsi_packet *packet, EXPORT_SYMBOL(mipi_dsi_create_packet); /** - * mipi_dsi_dcs_write - send DCS write command - * @dsi: DSI device - * @data: pointer to the command followed by parameters - * @len: length of @data + * mipi_dsi_dcs_write_buffer() - transmit a DCS command with payload + * @dsi: DSI peripheral device + * @data: buffer containing data to be transmitted + * @len: size of transmission buffer + * + * This function will automatically choose the right data type depending on + * the command payload length. + * + * Return: The number of bytes successfully transmitted or a negative error + * code on failure. */ -ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data, - size_t len) +ssize_t mipi_dsi_dcs_write_buffer(struct mipi_dsi_device *dsi, + const void *data, size_t len) { struct mipi_dsi_msg msg = { .channel = dsi->channel, @@ -350,12 +356,15 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data, switch (len) { case 0: return -EINVAL; + case 1: msg.type = MIPI_DSI_DCS_SHORT_WRITE; break; + case 2: msg.type = MIPI_DSI_DCS_SHORT_WRITE_PARAM; break; + default: msg.type = MIPI_DSI_DCS_LONG_WRITE; break; @@ -363,16 +372,60 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data, return mipi_dsi_device_transfer(dsi, &msg); } +EXPORT_SYMBOL(mipi_dsi_dcs_write_buffer); + +/** + * mipi_dsi_dcs_write() - send DCS write command + * @dsi: DSI peripheral device + * @cmd: DCS command + * @data: buffer containing the command payload + * @len: command payload length + * + * This function will automatically choose the right data type depending on + * the command payload length. + * + * Return: The number of bytes successfully transmitted or a negative error + * code on failure. + */ +ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, u8 cmd, + const void *data, size_t len) +{ + ssize_t err; + size_t size; + u8 *tx; + + if (len > 0) { + size = 1 + len; + + tx = kmalloc(size, GFP_KERNEL); + if (!tx) + return -ENOMEM; + + /* concatenate the DCS command byte and the payload */ + tx[0] = cmd; + memcpy(&tx[1], data, len); + } else { + tx = &cmd; + size = 1; + } + + err = mipi_dsi_dcs_write_buffer(dsi, tx, size); + + if (len > 0) + kfree(tx); + + return err; +} EXPORT_SYMBOL(mipi_dsi_dcs_write); /** - * mipi_dsi_dcs_read - send DCS read request command - * @dsi: DSI device - * @cmd: DCS read command - * @data: pointer to read buffer - * @len: length of @data + * mipi_dsi_dcs_read() - send DCS read request command + * @dsi: DSI peripheral device + * @cmd: DCS command + * @data: buffer in which to receive data + * @len: size of receive buffer * - * Function returns number of read bytes or error code. + * Return: The number of bytes read or a negative error code on failure. */ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, size_t len) diff --git a/drivers/gpu/drm/panel/panel-s6e8aa0.c b/drivers/gpu/drm/panel/panel-s6e8aa0.c index 96f4476609b0..17bc7991344d 100644 --- a/drivers/gpu/drm/panel/panel-s6e8aa0.c +++ b/drivers/gpu/drm/panel/panel-s6e8aa0.c @@ -141,7 +141,7 @@ static void s6e8aa0_dcs_write(struct s6e8aa0 *ctx, const void *data, size_t len) if (ctx->error < 0) return; - ret = mipi_dsi_dcs_write(dsi, data, len); + ret = mipi_dsi_dcs_write_buffer(dsi, data, len); if (ret < 0) { dev_err(ctx->dev, "error %zd writing dcs seq: %*ph\n", ret, (int)len, data); diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 6e3e3aadd2d7..44cece97f333 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -153,8 +153,10 @@ 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); -ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data, - size_t len); +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, + const void *data, size_t len); ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data, size_t len); |