Commit a82327cc authored by Dong Aisheng's avatar Dong Aisheng Committed by Abel Vesa
Browse files

clk: imx: scu: add parent save and restore 



Add clock parent save and restore.

Signed-off-by: default avatarDong Aisheng <aisheng.dong@nxp.com>
Reviewed-by: default avatarAbel Vesa <abel.vesa@nxp.com>
Signed-off-by: default avatarAbel Vesa <abel.vesa@nxp.com>
parent 7487986c

drivers/clk/imx/clk-scu.c

+28 −1
Original line number Diff line number Diff line
@@ -50,6 +50,8 @@ struct clk_scu { 
	u8 clk_type;



	/* for state save&restore */

	struct clk_hw *parent;

	u8 parent_index;

	bool is_enabled;

	u32 rate;

};
@@ -337,6 +339,8 @@ static u8 clk_scu_get_parent(struct clk_hw *hw) 
		return 0;

	}



	clk->parent_index = msg.data.resp.parent;



	return msg.data.resp.parent;

}
@@ -345,6 +349,7 @@ static int clk_scu_set_parent(struct clk_hw *hw, u8 index) 
	struct clk_scu *clk = to_clk_scu(hw);

	struct imx_sc_msg_set_clock_parent msg;

	struct imx_sc_rpc_msg *hdr = &msg.hdr;

	int ret;



	hdr->ver = IMX_SC_RPC_VERSION;

	hdr->svc = IMX_SC_RPC_SVC_PM;
@@ -355,7 +360,16 @@ static int clk_scu_set_parent(struct clk_hw *hw, u8 index) 
	msg.clk = clk->clk_type;

	msg.parent = index;



	return imx_scu_call_rpc(ccm_ipc_handle, &msg, true);

	ret = imx_scu_call_rpc(ccm_ipc_handle, &msg, true);

	if (ret) {

		pr_err("%s: failed to set clock parent %d\n",

		       clk_hw_get_name(hw), ret);

		return ret;

	}



	clk->parent_index = index;



	return 0;

}



static int sc_pm_clock_enable(struct imx_sc_ipc *ipc, u16 resource,
@@ -547,6 +561,8 @@ static int __maybe_unused imx_clk_scu_suspend(struct device *dev) 
	    (rsrc_id == IMX_SC_R_A72))

		return 0;



	clk->parent = clk_hw_get_parent(&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 ||
@@ -557,6 +573,10 @@ static int __maybe_unused imx_clk_scu_suspend(struct device *dev) 
		clk->rate = clk_hw_get_rate(&clk->hw);

	clk->is_enabled = clk_hw_is_enabled(&clk->hw);



	if (clk->parent)

		dev_dbg(dev, "save parent %s idx %u\n", clk_hw_get_name(clk->parent),

			clk->parent_index);



	if (clk->rate)

		dev_dbg(dev, "save rate %d\n", clk->rate);
@@ -576,6 +596,13 @@ static int __maybe_unused imx_clk_scu_resume(struct device *dev) 
	    (rsrc_id == IMX_SC_R_A72))

		return 0;



	if (clk->parent) {

		ret = clk_scu_set_parent(&clk->hw, clk->parent_index);

		dev_dbg(dev, "restore parent %s idx %u %s\n",

			clk_hw_get_name(clk->parent),

			clk->parent_index, !ret ? "success" : "failed");

	}



	if (clk->rate) {

		ret = clk_scu_set_rate(&clk->hw, clk->rate, 0);

		dev_dbg(dev, "restore rate %d %s\n", clk->rate,