drm/exynos: mipi-dsi: consider non-continuous clock mode

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 sets 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>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index d3393098f424..670c2f9be31c 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 {