drm/omap: dsi: lp/hs switching support for transfer()

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@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20201215104657.802264-24-tomi.valkeinen@ti.com

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) {
@@ -573,7 +573,7 @@ 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)
@@ -616,7 +616,7 @@ 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:

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -329,6 +329,7 @@ struct dsi_data {
 	int irq;
 
 	bool is_enabled;
+	bool in_lp_mode;
 
 	struct clk *dss_clk;
 	struct regmap *syscon;
@@ -2433,6 +2434,8 @@ 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)
@@ -4690,6 +4693,10 @@ 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 (!!(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:
@@ -4750,8 +4757,6 @@ 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,

drivers/gpu/drm/omapdrm/dss/omapdss.h

@@ -291,8 +291,6 @@ 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,