This patch adds some generic functions for DCS like below to standize on common APIs rather than per-driver implementations.
mipi_dcs_enter_sleep_mode() / mipi_dcs_exit_sleep_mode() - These are required to disable / enable all blocks inside the display module.
mipi_dcs_set_display_off() / mipi_dcs_set_display_on() - These are required to stop / start displaying the image data on the display device.
mipi_dcs_set_tear_off() / mipi_dcs_set_tear_on() - These are required to turn off or on the display module's TE output signal on the TE signal line.
mipi_dsi_set_maximum_return_packet_size() - Although it is not related with DCS, it is required before using mipi_dsi_dcs_read() to specify the maximum size of the payload in a long packet.
Signed-off-by: YoungJun Cho yj44.cho@samsung.com Acked-by: Inki Dae inki.dae@samsung.com Acked-by: Kyungmin Park kyungmin.park@samsung.com --- drivers/gpu/drm/drm_mipi_dsi.c | 113 +++++++++++++++++++++++++++++++++++++++++ include/drm/drm_mipi_dsi.h | 14 +++++ 2 files changed, 127 insertions(+)
diff --git a/drivers/gpu/drm/drm_mipi_dsi.c b/drivers/gpu/drm/drm_mipi_dsi.c index 6b2bbda..ba506d7 100644 --- a/drivers/gpu/drm/drm_mipi_dsi.c +++ b/drivers/gpu/drm/drm_mipi_dsi.c @@ -269,6 +269,119 @@ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, unsigned int channel, } EXPORT_SYMBOL(mipi_dsi_dcs_read);
+/** + * mipi_dsi_set_maximum_return_packet_size + * - specify the maximum size of the payload in a Long packet transmitted from + * peripheral back to the host processor + * @dsi: DSI peripheral device + * @size: the maximum size of the payload + */ +int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, + u16 size) +{ + const struct mipi_dsi_host_ops *ops = dsi->host->ops; + struct mipi_dsi_msg msg; + + if (!ops || !ops->transfer) + return -ENOSYS; + + memset(&msg, 0, sizeof(msg)); + msg.channel = dsi->channel; + msg.type = MIPI_DSI_SET_MAXIMUM_RETURN_PACKET_SIZE; + msg.tx_len = sizeof(size); + msg.tx_buf = (const void *)(&size); + + return ops->transfer(dsi->host, &msg); +} +EXPORT_SYMBOL(mipi_dsi_set_maximum_return_packet_size); + +/** + * mipi_dcs_enter_sleep_mode - disable all unnecessary blocks inside the display + * module except interface communication + * @dsi: DSI peripheral device + */ +int mipi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi) +{ + u8 data = MIPI_DCS_ENTER_SLEEP_MODE; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)&data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_enter_sleep_mode); + +/** + * mipi_dcs_exit_sleep_mode - enable all blocks inside the display module + * @dsi: DSI peripheral device + */ +int mipi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi) +{ + u8 data = MIPI_DCS_EXIT_SLEEP_MODE; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)&data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_exit_sleep_mode); + +/** + * mipi_dcs_set_display_off - stop displaying the image data on the display device + * @dsi: DSI peripheral device + */ +int mipi_dcs_set_display_off(struct mipi_dsi_device *dsi) +{ + u8 data = MIPI_DCS_SET_DISPLAY_OFF; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)&data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_set_display_off); + +/** + * mipi_dcs_set_display_on - start displaying the image data on the display device + * @dsi: DSI peripheral device + */ +int mipi_dcs_set_display_on(struct mipi_dsi_device *dsi) +{ + u8 data = MIPI_DCS_SET_DISPLAY_ON; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)&data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_set_display_on); + +/** + * mipi_dcs_set_tear_off - turn off the display module's Tearing Effect output + * signal on the TE signal line + * @dsi: DSI peripheral device + */ +int mipi_dcs_set_tear_off(struct mipi_dsi_device *dsi) +{ + u8 data = MIPI_DCS_SET_TEAR_OFF; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)&data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_set_tear_off); + +/** + * mipi_dcs_set_tear_on - turn on the display module's Tearing Effect output + * signal on the TE signal line. + * @dsi: DSI peripheral device + * @mode: the Tearing Effect output line mode + * - MIPI_DCS_TEAR_MODE_VBLANK: the TE output line consists of V-Blanking + * information only + * - MIPI_DCS_TEAR_MODE_VHBLANK : the TE output line consists of both + * V-Blanking and H-Blanking information + */ +int mipi_dcs_set_tear_on(struct mipi_dsi_device *dsi, + enum mipi_dcs_tear_mode mode) +{ + u8 data[2] = { MIPI_DCS_SET_TEAR_ON, mode }; + + return mipi_dsi_dcs_write(dsi, dsi->channel, (const void *)data, + sizeof(data)); +} +EXPORT_SYMBOL(mipi_dcs_set_tear_on); + static int mipi_dsi_drv_probe(struct device *dev) { struct mipi_dsi_driver *drv = to_mipi_dsi_driver(dev->driver); diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 1c41e49..5af2d0e 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -106,6 +106,11 @@ enum mipi_dsi_pixel_format { MIPI_DSI_FMT_RGB565, };
+enum mipi_dcs_tear_mode { + MIPI_DCS_TEAR_MODE_VBLANK, + MIPI_DCS_TEAR_MODE_VHBLANK, +}; + /** * struct mipi_dsi_device - DSI peripheral device * @host: DSI host for this peripheral @@ -133,6 +138,15 @@ int mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, unsigned int channel, const void *data, size_t len); ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, unsigned int channel, u8 cmd, void *data, size_t len); +int mipi_dsi_set_maximum_return_packet_size(struct mipi_dsi_device *dsi, + u16 size); +int mipi_dcs_enter_sleep_mode(struct mipi_dsi_device *dsi); +int mipi_dcs_exit_sleep_mode(struct mipi_dsi_device *dsi); +int mipi_dcs_set_display_off(struct mipi_dsi_device *dsi); +int mipi_dcs_set_display_on(struct mipi_dsi_device *dsi); +int mipi_dcs_set_tear_off(struct mipi_dsi_device *dsi); +int mipi_dcs_set_tear_on(struct mipi_dsi_device *dsi, + enum mipi_dcs_tear_mode mode);
/** * struct mipi_dsi_driver - DSI driver