On 08/18/2014 10:11 AM, Inki Dae wrote:
This patch adds non-continuous clock mode support
Clock mode on Clock Lane is continuous clock by default. So if we want to transmit data in non-continuous clock mode to reduce power consumption, then host driver should set DSIM_CLKLANE_STOP bit. In this case, host controller turns off HS clock between high speed transmissions.
For this, this patch adds a new bit, DSIM_CLKLANE_STOP, and makes the host driver set this bit only in case that dsi->mode_flags has MIPI_DSI_CLOCK_NON_CONTINUOUS flag.
Signed-off-by: Inki Dae inki.dae@samsung.com
Acked-by: Andrzej Hajda a.hajda@samsung.com -- Regards Andrzej
drivers/gpu/drm/exynos/exynos_drm_dsi.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c index 442aa2d..2d47290 100644 --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c @@ -114,6 +114,8 @@ #define DSIM_SYNC_INFORM (1 << 27) #define DSIM_EOT_DISABLE (1 << 28) #define DSIM_MFLUSH_VS (1 << 29) +/* This flag is valid only for exynos3250/3472/4415/5260/5430 */ +#define DSIM_CLKLANE_STOP (1 << 30)
/* DSIM_ESCMODE */ #define DSIM_TX_TRIGGER_RST (1 << 4) @@ -262,6 +264,7 @@ struct exynos_dsi_driver_data { unsigned int plltmr_reg;
unsigned int has_freqband:1;
- unsigned int has_clklane_stop:1;
};
struct exynos_dsi { @@ -304,6 +307,7 @@ struct exynos_dsi { static struct exynos_dsi_driver_data exynos4_dsi_driver_data = { .plltmr_reg = 0x50, .has_freqband = 1,
- .has_clklane_stop = 1,
};
static struct exynos_dsi_driver_data exynos5_dsi_driver_data = { @@ -569,6 +573,7 @@ static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
static int exynos_dsi_init_link(struct exynos_dsi *dsi) {
- struct exynos_dsi_driver_data *driver_data = dsi->driver_data; int timeout; u32 reg; u32 lanes_mask;
@@ -650,6 +655,20 @@ static int exynos_dsi_init_link(struct exynos_dsi *dsi) reg |= DSIM_LANE_EN(lanes_mask); writel(reg, dsi->reg_base + DSIM_CONFIG_REG);
- /*
* Use non-continuous clock mode if the periparal wants and* host controller supports** In non-continous clock mode, host controller will turn off* the HS clock between high-speed transmissions to reduce* power consumption.*/- if (driver_data->has_clklane_stop &&
dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS) {reg |= DSIM_CLKLANE_STOP;writel(reg, dsi->reg_base + DSIM_CONFIG_REG);- }
- /* Check clock and data lane state are stop state */ timeout = 100; do {