linux-kernel - Re: [PATCH] drivers: qcom: rpmh-rsc: Check cmd_db

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Date:   Mon, 18 Jun 2018 11:42:07 -0600
From:   Lina Iyer <ilina@...eaurora.org>
To:     Douglas Anderson <dianders@...omium.org>
Cc:     andy.gross@...aro.org, tdas@...eaurora.org,
        collinsd@...eaurora.org, sboyd@...nel.org, broonie@...nel.org,
        rplsssn@...eaurora.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, David Brown <david.brown@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: qcom: rpmh-rsc: Check cmd_db_ready() to help
 children

On Mon, Jun 18 2018 at 11:23 -0600, Douglas Anderson wrote:
>Children of RPMh will need access to cmd_db.  Rather than having each
>child have code to check if cmd_db is ready let's add the check to
>RPMh.
>
>Suggested-by: Stephen Boyd <sboyd@...nel.org>
>Signed-off-by: Douglas Anderson <dianders@...omium.org>
Acked-by: Lina Iyer <ilina@...eaurora.org>
>---
>This code is based upon v11 of Lina and Raju's RPMh series.
>
>With this we'll be able to remove this boilerplate code from
>clk-rpmh.c and qcom-rpmh-regulator.c.  Neither of these files has
>landed upstream yet but patches are pretty far along.
>
> drivers/soc/qcom/rpmh-rsc.c | 13 +++++++++++++
> 1 file changed, 13 insertions(+)
>
>diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
>index 144a058407c0..ad85523bdd3b 100644
>--- a/drivers/soc/qcom/rpmh-rsc.c
>+++ b/drivers/soc/qcom/rpmh-rsc.c
>@@ -18,6 +18,7 @@
> #include <linux/slab.h>
> #include <linux/spinlock.h>
>
>+#include <soc/qcom/cmd-db.h>
> #include <soc/qcom/tcs.h>
> #include <dt-bindings/soc/qcom,rpmh-rsc.h>
>
>@@ -621,6 +622,18 @@ static int rpmh_rsc_probe(struct platform_device *pdev)
> 	struct rsc_drv *drv;
> 	int ret, irq;
>
>+	/*
>+	 * Even though RPMh doesn't directly use cmd-db, all of its children
>+	 * do.  To avoid adding this check to our children we'll do it now.
nit: Double space before To
>+	 */
>+	ret = cmd_db_ready();
>+	if (ret) {
>+		if (ret != -EPROBE_DEFER)
>+			dev_err(&pdev->dev, "Command DB not available (%d)\n",
>+									ret);
>+		return ret;
>+	}
>+
> 	drv = devm_kzalloc(&pdev->dev, sizeof(*drv), GFP_KERNEL);
> 	if (!drv)
> 		return -ENOMEM;
>--
>2.18.0.rc1.244.gcf134e6275-goog
>