From: Geert Uytterhoeven <geert+renesas@glider.be>
Date: Wed, 28 Jun 2017 19:15:49 +0000 (+0200)
Subject: clk: renesas: rcar-gen3: Restore R clock during resume
X-Git-Tag: v4.15-rc1~48^2~18^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=3f7a4d084159c52513d1ff77f3b3b880bcf517d9;p=thirdparty%2Fkernel%2Flinux.git

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: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---

diff --git a/drivers/clk/renesas/rcar-gen3-cpg.c b/drivers/clk/renesas/rcar-gen3-cpg.c
index 267b5629e3bdb..0904886f55015 100644
--- a/drivers/clk/renesas/rcar-gen3-cpg.c
+++ b/drivers/clk/renesas/rcar-gen3-cpg.c
@@ -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;
 		}