linux-kernel - Re: [PATCH V1 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling support

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Date:   Wed, 03 Jun 2020 17:22:54 +0530
From:   Sibi Sankar <sibis@...eaurora.org>
To:     Pradeep P V K <ppvk@...eaurora.org>
Cc:     bjorn.andersson@...aro.org, adrian.hunter@...el.com,
        robh+dt@...nel.org, ulf.hansson@...aro.org,
        vbadigan@...eaurora.org, sboyd@...nel.org,
        georgi.djakov@...aro.org, mka@...omium.org,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-mmc-owner@...r.kernel.org, rnayak@...eaurora.org,
        matthias@...omium.org, linux-arm-msm-owner@...r.kernel.org
Subject: Re: [PATCH V1 1/2] mmc: sdhci-msm: Add interconnect bandwidth scaling
 support

Hey Pradeep,
Thanks for the patch.

On 2020-06-03 14:39, Pradeep P V K wrote:
> Interconnect bandwidth scaling support is now added as a
> part of OPP [1]. So, make sure interconnect driver is ready
> before handling interconnect scaling.
> 
> This change is based on
> [1] [Patch v8] Introduce OPP bandwidth bindings
> (https://lkml.org/lkml/2020/5/12/493)
> 
> [2] [Patch v3] mmc: sdhci-msm: Fix error handling
> for dev_pm_opp_of_add_table()
> (https://lkml.org/lkml/2020/5/5/491)
> 
> Signed-off-by: Pradeep P V K <ppvk@...eaurora.org>
> ---
>  drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/drivers/mmc/host/sdhci-msm.c 
> b/drivers/mmc/host/sdhci-msm.c
> index b277dd7..bf95484 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -14,6 +14,7 @@
>  #include <linux/slab.h>
>  #include <linux/iopoll.h>
>  #include <linux/regulator/consumer.h>
> +#include <linux/interconnect.h>
> 
>  #include "sdhci-pltfm.h"
>  #include "cqhci.h"
> @@ -1999,6 +2000,7 @@ static int sdhci_msm_probe(struct platform_device 
> *pdev)
>  	struct sdhci_pltfm_host *pltfm_host;
>  	struct sdhci_msm_host *msm_host;
>  	struct clk *clk;
> +	struct icc_path *sdhc_path;
>  	int ret;
>  	u16 host_version, core_minor;
>  	u32 core_version, config;
> @@ -2070,6 +2072,20 @@ static int sdhci_msm_probe(struct 
> platform_device *pdev)
>  	}
>  	msm_host->bulk_clks[0].clk = clk;
> 
> +	/* Make sure that ICC driver is ready for interconnect bandwdith
> +	 * scaling before registering the device for OPP.
> +	 */
> +	sdhc_path = of_icc_get(&pdev->dev, NULL);
> +	ret = PTR_ERR_OR_ZERO(sdhc_path);
> +	if (ret) {
> +		if (ret == -EPROBE_DEFER)
> +			dev_info(&pdev->dev, "defer icc path: %d\n", ret);
> +		else
> +			dev_err(&pdev->dev, "failed to get icc path:%d\n", ret);
> +		goto bus_clk_disable;
> +	}
> +	icc_put(sdhc_path);

ret = dev_pm_opp_of_find_icc_paths(&pdev->dev, NULL);

since there are multiple paths
described in the bindings you
should use ^^ instead and you
can drop temporary path as well.

> +
>  	msm_host->opp_table = dev_pm_opp_set_clkname(&pdev->dev, "core");
>  	if (IS_ERR(msm_host->opp_table)) {
>  		ret = PTR_ERR(msm_host->opp_table);

-- 
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