OMAP2PLUS: DSS2: Cleanup clock source related code

Clean up some of the DSS functions which select/get clock sources, use switch
to select the clock source members since more clock sources will be introduced
later on.

Remove the use of macro CONFIG_OMAP2_DSS_DSI in dispc_fclk_rate, use a dummy
inline for function for dsi_get_pll_hsdiv_dispc_rate() instead for code clarity.
Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/omap2/dss/dispc.c

@@ -2341,14 +2341,17 @@ unsigned long dispc_fclk_rate(void)
 {
 	unsigned long r = 0;
 
-	if (dss_get_dispc_clk_source() == DSS_CLK_SRC_FCK)
+	switch (dss_get_dispc_clk_source()) {
+	case DSS_CLK_SRC_FCK:
 		r = dss_clk_get_rate(DSS_CLK_FCK);
-	else
-#ifdef CONFIG_OMAP2_DSS_DSI
+		break;
+	case DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
 		r = dsi_get_pll_hsdiv_dispc_rate();
-#else
-	BUG();
-#endif
+		break;
+	default:
+		BUG();
+	}
+
 	return r;
 }
 

drivers/video/omap2/dss/dss.c

@@ -293,13 +293,17 @@ void dss_select_dispc_clk_source(enum dss_clk_source clk_src)
 {
 	int b;
 
-	BUG_ON(clk_src != DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC &&
-			clk_src != DSS_CLK_SRC_FCK);
-
-	b = clk_src == DSS_CLK_SRC_FCK ? 0 : 1;
-
-	if (clk_src == DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC)
+	switch (clk_src) {
+	case DSS_CLK_SRC_FCK:
+		b = 0;
+		break;
+	case DSS_CLK_SRC_DSI_PLL_HSDIV_DISPC:
+		b = 1;
 		dsi_wait_pll_hsdiv_dispc_active();
+		break;
+	default:
+		BUG();
+	}
 
 	REG_FLD_MOD(DSS_CONTROL, b, 0, 0);	/* DISPC_CLK_SWITCH */
 
@@ -310,13 +314,17 @@ void dss_select_dsi_clk_source(enum dss_clk_source clk_src)
 {
 	int b;
 
-	BUG_ON(clk_src != DSS_CLK_SRC_DSI_PLL_HSDIV_DSI &&
-			clk_src != DSS_CLK_SRC_FCK);
-
-	b = clk_src == DSS_CLK_SRC_FCK ? 0 : 1;
-
-	if (clk_src == DSS_CLK_SRC_DSI_PLL_HSDIV_DSI)
+	switch (clk_src) {
+	case DSS_CLK_SRC_FCK:
+		b = 0;
+		break;
+	case DSS_CLK_SRC_DSI_PLL_HSDIV_DSI:
+		b = 1;
 		dsi_wait_pll_hsdiv_dsi_active();
+		break;
+	default:
+		BUG();
+	}
 
 	REG_FLD_MOD(DSS_CONTROL, b, 1, 1);	/* DSI_CLK_SWITCH */
 

drivers/video/omap2/dss/dss.h

@@ -299,6 +299,11 @@ static inline int dsi_init_platform_driver(void)
 static inline void dsi_uninit_platform_driver(void)
 {
 }
+static inline unsigned long dsi_get_pll_hsdiv_dispc_rate(void)
+{
+	WARN("%s: DSI not compiled in, returning rate as 0\n", __func__);
+	return 0;
+}
 static inline void dsi_wait_pll_hsdiv_dispc_active(void)
 {
 }