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 <Anson.Huang@nxp.com>
Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: Abel Vesa <abel.vesa@nxp.com>
Signed-off-by: Abel Vesa <abel.vesa@nxp.com>

diff --git a/drivers/clk/imx/clk-scu.c b/drivers/clk/imx/clk-scu.c
index 9f7ad3c..37919ff 100644 (file)
--- a/drivers/clk/imx/clk-scu.c
+++ b/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)