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Commit 06f84b19 authored by Ping Li's avatar Ping Li Committed by Gerrit - the friendly Code Review server
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msm: mdss: Add support to retain AD RAMs 



Modify the MDP_CBCR bits to retain the AD RAMs through idle power
collapse(IPC).

Bits setting when device enters IPC:
  - MEM_CORE_ON: 1
  - MEM_PERIPH_ON: 0
  - MEM_PERIPH_OFF: 1
Bits setting when device exits the IPC:
  - MEM_CORE_ON: 1
  - MEM_PERIPH_ON: 1
  - MEM_PERIPH_OFF: 0

Change-Id: I10749312d905eb4629e94e396b1604667738e84f
Signed-off-by: default avatarPing Li <pingli@codeaurora.org>
parent 25a2528e

drivers/video/msm/mdss/mdss_mdp.c

+39 −0
Original line number Diff line number Diff line
@@ -847,6 +847,36 @@ int mdss_iommu_ctrl(int enable) 
		return mdata->iommu_ref_cnt;

}



static void mdss_mdp_memory_retention_enter(void)

{

	struct clk *mdss_mdp_clk = NULL;

	struct clk *mdp_vote_clk = mdss_mdp_get_clk(MDSS_CLK_MDP_CORE);



	if (mdp_vote_clk) {

		mdss_mdp_clk = clk_get_parent(mdp_vote_clk);

		if (mdss_mdp_clk) {

			clk_set_flags(mdss_mdp_clk, CLKFLAG_RETAIN_MEM);

			clk_set_flags(mdss_mdp_clk, CLKFLAG_PERIPH_OFF_SET);

			clk_set_flags(mdss_mdp_clk, CLKFLAG_NORETAIN_PERIPH);

		}

	}

}



static void mdss_mdp_memory_retention_exit(void)

{

	struct clk *mdss_mdp_clk = NULL;

	struct clk *mdp_vote_clk = mdss_mdp_get_clk(MDSS_CLK_MDP_CORE);



	if (mdp_vote_clk) {

		mdss_mdp_clk = clk_get_parent(mdp_vote_clk);

		if (mdss_mdp_clk) {

			clk_set_flags(mdss_mdp_clk, CLKFLAG_RETAIN_MEM);

			clk_set_flags(mdss_mdp_clk, CLKFLAG_RETAIN_PERIPH);

			clk_set_flags(mdss_mdp_clk, CLKFLAG_PERIPH_OFF_CLEAR);

		}

	}

}



/**

 * mdss_mdp_idle_pc_restore() - Restore MDSS settings when exiting idle pc

 *
@@ -874,6 +904,14 @@ static int mdss_mdp_idle_pc_restore(void) 
	}

	mdss_hw_init(mdata);

	mdss_iommu_ctrl(0);



	/**

	 * sleep 10 microseconds to make sure AD auto-reinitialization

	 * is done

	 */

	udelay(10);

	mdss_mdp_memory_retention_exit();



	mdss_mdp_ctl_restore(true);

	mdata->idle_pc = false;
@@ -4050,6 +4088,7 @@ static void mdss_mdp_footswitch_ctrl(struct mdss_data_type *mdata, int on) 
				mdata->idle_pc = true;

				pr_debug("idle pc. active overlays=%d\n",

					active_cnt);

				mdss_mdp_memory_retention_enter();

			} else {

				mdss_mdp_cx_ctrl(mdata, false);

				mdss_mdp_batfet_ctrl(mdata, false);