diff options
| -rw-r--r-- | sound/soc/renesas/rcar/adg.c | 29 |
1 files changed, 28 insertions, 1 deletions
diff --git a/sound/soc/renesas/rcar/adg.c b/sound/soc/renesas/rcar/adg.c index 5479cefb6dbe..53efd1be5139 100644 --- a/sound/soc/renesas/rcar/adg.c +++ b/sound/soc/renesas/rcar/adg.c @@ -45,6 +45,7 @@ struct rsnd_adg { struct rsnd_mod mod; int clkin_rate[CLKINMAX]; bool ssi_clk_prepared; + bool clk_enabled; int clkin_size; int clkout_size; u32 ckr; @@ -463,6 +464,22 @@ int rsnd_adg_clk_control(struct rsnd_priv *priv, int enable) struct clk *clk; int ret = 0, i; + /* + * rsnd_adg_clk_enable() and rsnd_adg_clk_disable() can be called + * redundantly, for example when system suspend follows a resume + * whose enable failed. Make this function idempotent so that the + * "adg" clock, which has no clkin_rate[] style guard, is never + * disabled twice. + */ + if (enable) { + if (adg->clk_enabled) + return 0; + } else { + if (!adg->clk_enabled) + return 0; + adg->clk_enabled = false; + } + if (enable) { ret = clk_prepare_enable(adg->adg); if (ret < 0) @@ -520,12 +537,22 @@ int rsnd_adg_clk_control(struct rsnd_priv *priv, int enable) * rsnd_adg_clk_enable() might return error (_disable() will not). * We need to rollback in such case */ - if (ret < 0) + if (ret < 0) { + /* + * Mark as enabled so that the rollback below is not + * short-circuited by the idempotency guard. It clears + * the flag again on its way through. + */ + adg->clk_enabled = true; rsnd_adg_clk_disable(priv); + return ret; + } /* disable adg */ if (!enable) clk_disable_unprepare(adg->adg); + else + adg->clk_enabled = true; return ret; } |