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Commit 3f7a4d08 authored by Geert Uytterhoeven's avatar Geert Uytterhoeven
Browse files

clk: renesas: rcar-gen3: Restore R clock during resume 



On R-Car Gen3 systems, PSCI system suspend powers down the SoC, losing
clock configuration.  Register a notifier to save/restore the RCKCR
register during system suspend/resume.

Signed-off-by: default avatarGeert Uytterhoeven <geert+renesas@glider.be>
Tested-by: default avatarNiklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
parent 9f55b17f

drivers/clk/renesas/rcar-gen3-cpg.c

+11 −2
Original line number Diff line number Diff line
@@ -373,18 +373,27 @@ struct clk * __init rcar_gen3_cpg_clk_register(struct device *dev, 


	case CLK_TYPE_GEN3_R:

		if (cpg_quirks & RCKCR_CKSEL) {

			struct cpg_simple_notifier *csn;



			csn = kzalloc(sizeof(*csn), GFP_KERNEL);

			if (!csn)

				return ERR_PTR(-ENOMEM);



			csn->reg = base + CPG_RCKCR;



			/*

			 * RINT is default.

			 * Only if EXTALR is populated, we switch to it.

			 */

			value = readl(base + CPG_RCKCR) & 0x3f;

			value = readl(csn->reg) & 0x3f;



			if (clk_get_rate(clks[cpg_clk_extalr])) {

				parent = clks[cpg_clk_extalr];

				value |= BIT(15);

			}



			writel(value, base + CPG_RCKCR);

			writel(value, csn->reg);

			cpg_simple_notifier_register(notifiers, csn);

			break;

		}