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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>
This commit is contained in:
Geert Uytterhoeven 2017-06-28 21:15:49 +02:00
parent 9f55b17ff6
commit 3f7a4d0841
1 changed files with 11 additions and 2 deletions
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13
drivers/clk/renesas/rcar-gen3-cpg.c
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@ -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;
}