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drm/mipi-dsi: consider low power transmission

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This patch adds a new flag, MIPI_DSI-MODE_LPM, to transmit data
in low power. With this flag, msg.flags has MIPI_DSI_MSG_USE_LPM
so that host driver of each SoC can clear or set relevant register
bit for low power transmission.

All host drivers shall support continuous clock behavior on the
Clock Lane, and optionally may support non-continuous clock behavior.
Both of them can transmit data in high speed of low power.

With each clock behavior, non-continuous or continuous clock mode,
host controller will transmit data in high speed by default so if
peripheral wants to receive data in low power, the peripheral driver
should set MIPI_DSI_MODE_LPM flag.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Inki Dae 2014-08-13 16:38:23 +09:00 committed by Inki Dae
parent 8525b5ec90
commit d87f09abb3
2 changed files with 8 additions and 0 deletions
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6
drivers/gpu/drm/drm_mipi_dsi.c
View File

@ -231,6 +231,9 @@ ssize_t mipi_dsi_dcs_write(struct mipi_dsi_device *dsi, const void *data,
break;
}
if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
msg.flags = MIPI_DSI_MSG_USE_LPM;
return ops->transfer(dsi->host, &msg);
}
EXPORT_SYMBOL(mipi_dsi_dcs_write);
@ -260,6 +263,9 @@ ssize_t mipi_dsi_dcs_read(struct mipi_dsi_device *dsi, u8 cmd, void *data,
if (!ops || !ops->transfer)
return -ENOSYS;
if (dsi->mode_flags & MIPI_DSI_MODE_LPM)
msg.flags = MIPI_DSI_MSG_USE_LPM;
return ops->transfer(dsi->host, &msg);
}
EXPORT_SYMBOL(mipi_dsi_dcs_read);

2
include/drm/drm_mipi_dsi.h
View File

@ -96,6 +96,8 @@ void mipi_dsi_host_unregister(struct mipi_dsi_host *host);
#define MIPI_DSI_MODE_EOT_PACKET BIT(9)
/* device supports non-continuous clock behavior (DSI spec 5.6.1) */
#define MIPI_DSI_CLOCK_NON_CONTINUOUS BIT(10)
/* transmit data in low power */
#define MIPI_DSI_MODE_LPM BIT(11)
enum mipi_dsi_pixel_format {
MIPI_DSI_FMT_RGB888,