clk: imx: scu: Only save DC SS clock using non-cached clock rate

Display sub-system has special clock settings in SCFW, the
bypassed clock is used instead of PLL in Linux kernel clock
tree, so when saving clock rate, need to save non-cached clock
rate for Display sub-system's bypass clocks, and other clocks
still use the cached clock rate which is with runtime PM ON.

Signed-off-by: Anson Huang <[email protected]>
Signed-off-by: Dong Aisheng <[email protected]>
Reviewed-by: Abel Vesa <[email protected]>
Signed-off-by: Abel Vesa <[email protected]>

Author: Anson-Huang

drivers/clk/imx/clk-scu.c

@@ -547,7 +547,14 @@ static int __maybe_unused imx_clk_scu_suspend(struct device *dev)
 	    (rsrc_id == IMX_SC_R_A72))
 		return 0;
 
-	clk->rate = clk_hw_get_rate(&clk->hw);
+	/* DC SS needs to handle bypass clock using non-cached clock rate */
+	if (clk->rsrc_id == IMX_SC_R_DC_0_VIDEO0 ||
+		clk->rsrc_id == IMX_SC_R_DC_0_VIDEO1 ||
+		clk->rsrc_id == IMX_SC_R_DC_1_VIDEO0 ||
+		clk->rsrc_id == IMX_SC_R_DC_1_VIDEO1)
+		clk->rate = clk_scu_recalc_rate(&clk->hw, 0);
+	else
+		clk->rate = clk_hw_get_rate(&clk->hw);
 	clk->is_enabled = clk_hw_is_enabled(&clk->hw);
 
 	if (clk->rate)