[PATCHv2 25/56] drm/omap: dsi: lp/hs switching support for transfer()

[Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>]

Integrate low-power / high-speed bus switching into transfer
function and drop the omapdrm specific enable_hs() callback.

Signed-off-by: Sebastian Reichel <sebastian.reichel@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c |  6 +++---
 drivers/gpu/drm/omapdrm/dss/dsi.c               | 13 +++++++++++--
 drivers/gpu/drm/omapdrm/dss/omapdss.h           |  2 --
 3 files changed, 14 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
index 8ad407a4072e..79ac1f6b375a 100644
--- a/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
+++ b/drivers/gpu/drm/omapdrm/displays/panel-dsi-cm.c
@@ -269,7 +269,7 @@ static int dsicm_exit_ulps(struct panel_drv_data *ddata)
 		return 0;
 
 	src->ops->enable(src);
-	src->ops->dsi.enable_hs(src, ddata->dsi->channel, true);
+	ddata->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 
 	r = _dsicm_enable_te(ddata, true);
 	if (r) {
@@ -574,7 +574,7 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
 
 	dsicm_hw_reset(ddata);
 
-	src->ops->dsi.enable_hs(src, ddata->dsi->channel, false);
+	ddata->dsi->mode_flags |= MIPI_DSI_MODE_LPM;
 
 	r = dsicm_sleep_out(ddata);
 	if (r)
@@ -617,7 +617,7 @@ static int dsicm_power_on(struct panel_drv_data *ddata)
 		ddata->intro_printed = true;
 	}
 
-	src->ops->dsi.enable_hs(src, ddata->dsi->channel, true);
+	ddata->dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
 
 	return 0;
 err:
diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
index 6c625b6d6d6b..15298ebb9d69 100644
--- a/drivers/gpu/drm/omapdrm/dss/dsi.c
+++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
@@ -45,6 +45,9 @@ struct dsi_reg { u16 module; u16 idx; };
 
 #define DSI_REG(mod, idx)		((const struct dsi_reg) { mod, idx })
 
+/* returns true iff both arguments logically differs */
+#define NEQV(a, b) (!(a) ^ !(b))
+
 /* DSI Protocol Engine */
 
 #define DSI_PROTO			0
@@ -329,6 +332,7 @@ struct dsi_data {
 	int irq;
 
 	bool is_enabled;
+	bool in_lp_mode;
 
 	struct clk *dss_clk;
 	struct regmap *syscon;
@@ -2431,6 +2435,8 @@ static void dsi_vc_enable_hs(struct omap_dss_device *dssdev, int channel,
 	/* start the DDR clock by sending a NULL packet */
 	if (dsi->vm_timings.ddr_clk_always_on && enable)
 		dsi_vc_send_null(dsi, channel);
+
+	dsi->in_lp_mode = !enable;
 }
 
 static void dsi_vc_flush_long_data(struct dsi_data *dsi, int channel)
@@ -4697,6 +4703,11 @@ static ssize_t omap_dsi_host_transfer(struct mipi_dsi_host *host,
 	struct dsi_data *dsi = host_to_omap(host);
 	struct omap_dss_device *dssdev = &dsi->output;
 
+	if (NEQV(msg->flags & MIPI_DSI_MSG_USE_LPM, dsi->in_lp_mode)) {
+		dsi_vc_enable_hs(dssdev, msg->channel,
+				 !(msg->flags & MIPI_DSI_MSG_USE_LPM));
+	}
+
 	switch (msg->type) {
 	case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
 	case MIPI_DSI_GENERIC_SHORT_WRITE_1_PARAM:
@@ -4757,8 +4768,6 @@ static const struct omap_dss_device_ops dsi_ops = {
 
 		.disable = dsi_display_disable,
 
-		.enable_hs = dsi_vc_enable_hs,
-
 		.set_config = dsi_set_config,
 
 		.enable_video_output = dsi_enable_video_output,
diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h
index 2c6c32240e20..355aa235c23c 100644
--- a/drivers/gpu/drm/omapdrm/dss/omapdss.h
+++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h
@@ -287,8 +287,6 @@ struct omapdss_dsi_ops {
 	int (*set_config)(struct omap_dss_device *dssdev,
 			const struct omap_dss_dsi_config *cfg);
 
-	void (*enable_hs)(struct omap_dss_device *dssdev, int channel,
-			bool enable);
 	int (*enable_te)(struct omap_dss_device *dssdev, bool enable);
 
 	int (*update)(struct omap_dss_device *dssdev, int channel,
-- 
2.25.0

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