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Commit bd7f51b6 authored by Padmanabhan Komanduru's avatar Padmanabhan Komanduru
Browse files

clk: qcom: mdss: update PLL resources based on ref count 



At present, the PLL resources are updated based on the
enable/disable parameter that is passed to the API. Add
support to update the PLL resources based on a ref count.
This avoids additional delay due to repeated enable/disable
of the resources and also maintains proper state of the PLL
resources.

Change-Id: I39b7ee2b33acb81acdb7dc1f4f387dc71381a464
Signed-off-by: default avatarPadmanabhan Komanduru <pkomandu@codeaurora.org>
parent 91719459

drivers/clk/qcom/mdss/mdss-pll.c

+22 −5
Original line number Diff line number Diff line
@@ -29,6 +29,7 @@ 
int mdss_pll_resource_enable(struct mdss_pll_resources *pll_res, bool enable)

{

	int rc = 0;

	int changed = 0;

	if (!pll_res) {

		pr_err("Invalid input parameters\n");

		return -EINVAL;
@@ -44,11 +45,27 @@ int mdss_pll_resource_enable(struct mdss_pll_resources *pll_res, bool enable) 
		return rc;

	}



	if (enable) {

		if (pll_res->resource_ref_cnt == 0)

			changed++;

		pll_res->resource_ref_cnt++;

	} else {

		if (pll_res->resource_ref_cnt) {

			pll_res->resource_ref_cnt--;

			if (pll_res->resource_ref_cnt == 0)

				changed++;

		} else {

			pr_err("PLL Resources already OFF\n");

		}

	}



	if (changed) {

		rc = mdss_pll_util_resource_enable(pll_res, enable);

		if (rc)

			pr_err("Resource update failed rc=%d\n", rc);

		else

			pll_res->resource_enable = enable;

	}



	return rc;

}

drivers/clk/qcom/mdss/mdss-pll.h

+3 −0
Original line number Diff line number Diff line
@@ -60,6 +60,9 @@ struct mdss_pll_resources { 
	/* HW recommended delay during configuration of vco clock rate */

	u32		vco_delay;



	/* Ref-count of the PLL resources */

	u32		resource_ref_cnt;



	/*

	 * Keep track to resource status to avoid updating same status for the

	 * pll from different paths