drm/omap: dpi: Simplify clock setting API

The dpi_set_pll_clk() and dpi_set_dispc_clk() return various information
through pointer arguments that are never used by the callers. Remove
them to simplify the clock setting API.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-48-laurent.pinchart@ideasonboard.com

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

@@ -287,9 +287,7 @@ static bool dpi_dss_clk_calc(struct dpi_data *dpi, unsigned long pck,
 
 
 
-static int dpi_set_pll_clk(struct dpi_data *dpi, enum omap_channel channel,
-		unsigned long pck_req, unsigned long *fck, int *lck_div,
-		int *pck_div)
+static int dpi_set_pll_clk(struct dpi_data *dpi, unsigned long pck_req)
 {
 	struct dpi_clk_calc_ctx ctx;
 	int r;
@@ -303,19 +301,15 @@ static int dpi_set_pll_clk(struct dpi_data *dpi, enum omap_channel channel,
 	if (r)
 		return r;
 
-	dss_select_lcd_clk_source(dpi->dss, channel, dpi->clk_src);
+	dss_select_lcd_clk_source(dpi->dss, dpi->output.dispc_channel,
+				  dpi->clk_src);
 
 	dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 
-	*fck = ctx.pll_cinfo.clkout[ctx.clkout_idx];
-	*lck_div = ctx.dispc_cinfo.lck_div;
-	*pck_div = ctx.dispc_cinfo.pck_div;
-
 	return 0;
 }
 
-static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
-		unsigned long *fck, int *lck_div, int *pck_div)
+static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req)
 {
 	struct dpi_clk_calc_ctx ctx;
 	int r;
@@ -331,29 +325,19 @@ static int dpi_set_dispc_clk(struct dpi_data *dpi, unsigned long pck_req,
 
 	dpi->mgr_config.clock_info = ctx.dispc_cinfo;
 
-	*fck = ctx.fck;
-	*lck_div = ctx.dispc_cinfo.lck_div;
-	*pck_div = ctx.dispc_cinfo.pck_div;
-
 	return 0;
 }
 
 static int dpi_set_mode(struct dpi_data *dpi)
 {
-	int lck_div = 0, pck_div = 0;
-	unsigned long fck = 0;
-	int r = 0;
+	int r;
 
 	if (dpi->pll)
-		r = dpi_set_pll_clk(dpi, dpi->output.dispc_channel,
-				    dpi->pixelclock, &fck, &lck_div, &pck_div);
+		r = dpi_set_pll_clk(dpi, dpi->pixelclock);
 	else
-		r = dpi_set_dispc_clk(dpi, dpi->pixelclock, &fck,
-				&lck_div, &pck_div);
-	if (r)
-		return r;
+		r = dpi_set_dispc_clk(dpi, dpi->pixelclock);
 
-	return 0;
+	return r;
 }
 
 static void dpi_config_lcd_manager(struct dpi_data *dpi)