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Date: Fri, 22 Sep 2017 13:22:17 +0200
From: Ulf Hansson <ulf.hansson@...aro.org>
To: Bjorn Andersson <bjorn.andersson@...aro.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
Venkat Gopalakrishnan <venkatg@...eaurora.org>,
Ritesh Harjani <riteshh@...eaurora.org>,
"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v2 1/2] mmc: sdhci-msm: Utilize bulk clock API
On 16 September 2017 at 01:35, Bjorn Andersson
<bjorn.andersson@...aro.org> wrote:
> By stuffing the runtime controlled clocks into a clk_bulk_data array we
> can utilize the newly introduced bulk clock operations and clean up the
> error paths. This allow us to handle additional clocks in subsequent
> patch, without the added complexity.
>
> Cc: Ritesh Harjani <riteshh@...eaurora.org>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Apparently clk_bulk_* isn't exported, which triggers the follow build errors.
https://storage.kernelci.org/ulfh/next/v4.14-rc1-23-g22a5146dde6b/arm64/allmodconfig/build.log
Can you perhaps send a patch exporting them, and tell Mike/Stephen to
pick it up as a part of the 4.14 rcs?
Kind regards
Uffe
> ---
>
> Changes since v1:
> - Dropped "clk" and "pclk" from sdhci_msm_host
>
> drivers/mmc/host/sdhci-msm.c | 80 +++++++++++++++++++-------------------------
> 1 file changed, 34 insertions(+), 46 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
> index 9d601dc0d646..b9ca1b1ef9a8 100644
> --- a/drivers/mmc/host/sdhci-msm.c
> +++ b/drivers/mmc/host/sdhci-msm.c
> @@ -127,10 +127,9 @@ struct sdhci_msm_host {
> struct platform_device *pdev;
> void __iomem *core_mem; /* MSM SDCC mapped address */
> int pwr_irq; /* power irq */
> - struct clk *clk; /* main SD/MMC bus clock */
> - struct clk *pclk; /* SDHC peripheral bus clock */
> struct clk *bus_clk; /* SDHC bus voter clock */
> struct clk *xo_clk; /* TCXO clk needed for FLL feature of cm_dll*/
> + struct clk_bulk_data bulk_clks[2]; /* core, iface clocks */
> unsigned long clk_rate;
> struct mmc_host *mmc;
> bool use_14lpp_dll_reset;
> @@ -164,10 +163,11 @@ static void msm_set_clock_rate_for_bus_mode(struct sdhci_host *host,
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> struct mmc_ios curr_ios = host->mmc->ios;
> + struct clk *core_clk = msm_host->bulk_clks[0].clk;
> int rc;
>
> clock = msm_get_clock_rate_for_bus_mode(host, clock);
> - rc = clk_set_rate(msm_host->clk, clock);
> + rc = clk_set_rate(core_clk, clock);
> if (rc) {
> pr_err("%s: Failed to set clock at rate %u at timing %d\n",
> mmc_hostname(host->mmc), clock,
> @@ -176,7 +176,7 @@ static void msm_set_clock_rate_for_bus_mode(struct sdhci_host *host,
> }
> msm_host->clk_rate = clock;
> pr_debug("%s: Setting clock at rate %lu at timing %d\n",
> - mmc_hostname(host->mmc), clk_get_rate(msm_host->clk),
> + mmc_hostname(host->mmc), clk_get_rate(core_clk),
> curr_ios.timing);
> }
>
> @@ -1032,8 +1032,9 @@ static unsigned int sdhci_msm_get_max_clock(struct sdhci_host *host)
> {
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> + struct clk *core_clk = msm_host->bulk_clks[0].clk;
>
> - return clk_round_rate(msm_host->clk, ULONG_MAX);
> + return clk_round_rate(core_clk, ULONG_MAX);
> }
>
> static unsigned int sdhci_msm_get_min_clock(struct sdhci_host *host)
> @@ -1124,6 +1125,7 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> struct sdhci_pltfm_host *pltfm_host;
> struct sdhci_msm_host *msm_host;
> struct resource *core_memres;
> + struct clk *clk;
> int ret;
> u16 host_version, core_minor;
> u32 core_version, config;
> @@ -1159,24 +1161,32 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> }
>
> /* Setup main peripheral bus clock */
> - msm_host->pclk = devm_clk_get(&pdev->dev, "iface");
> - if (IS_ERR(msm_host->pclk)) {
> - ret = PTR_ERR(msm_host->pclk);
> + clk = devm_clk_get(&pdev->dev, "iface");
> + if (IS_ERR(clk)) {
> + ret = PTR_ERR(clk);
> dev_err(&pdev->dev, "Peripheral clk setup failed (%d)\n", ret);
> goto bus_clk_disable;
> }
> -
> - ret = clk_prepare_enable(msm_host->pclk);
> - if (ret)
> - goto bus_clk_disable;
> + msm_host->bulk_clks[1].clk = clk;
>
> /* Setup SDC MMC clock */
> - msm_host->clk = devm_clk_get(&pdev->dev, "core");
> - if (IS_ERR(msm_host->clk)) {
> - ret = PTR_ERR(msm_host->clk);
> + clk = devm_clk_get(&pdev->dev, "core");
> + if (IS_ERR(clk)) {
> + ret = PTR_ERR(clk);
> dev_err(&pdev->dev, "SDC MMC clk setup failed (%d)\n", ret);
> - goto pclk_disable;
> + goto bus_clk_disable;
> }
> + msm_host->bulk_clks[0].clk = clk;
> +
> + /* Vote for maximum clock rate for maximum performance */
> + ret = clk_set_rate(clk, INT_MAX);
> + if (ret)
> + dev_warn(&pdev->dev, "core clock boost failed\n");
> +
> + ret = clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
> + msm_host->bulk_clks);
> + if (ret)
> + goto bus_clk_disable;
>
> /*
> * xo clock is needed for FLL feature of cm_dll.
> @@ -1188,15 +1198,6 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> dev_warn(&pdev->dev, "TCXO clk not present (%d)\n", ret);
> }
>
> - /* Vote for maximum clock rate for maximum performance */
> - ret = clk_set_rate(msm_host->clk, INT_MAX);
> - if (ret)
> - dev_warn(&pdev->dev, "core clock boost failed\n");
> -
> - ret = clk_prepare_enable(msm_host->clk);
> - if (ret)
> - goto pclk_disable;
> -
> core_memres = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> msm_host->core_mem = devm_ioremap_resource(&pdev->dev, core_memres);
>
> @@ -1289,9 +1290,8 @@ static int sdhci_msm_probe(struct platform_device *pdev)
> pm_runtime_set_suspended(&pdev->dev);
> pm_runtime_put_noidle(&pdev->dev);
> clk_disable:
> - clk_disable_unprepare(msm_host->clk);
> -pclk_disable:
> - clk_disable_unprepare(msm_host->pclk);
> + clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
> + msm_host->bulk_clks);
> bus_clk_disable:
> if (!IS_ERR(msm_host->bus_clk))
> clk_disable_unprepare(msm_host->bus_clk);
> @@ -1314,8 +1314,8 @@ static int sdhci_msm_remove(struct platform_device *pdev)
> pm_runtime_disable(&pdev->dev);
> pm_runtime_put_noidle(&pdev->dev);
>
> - clk_disable_unprepare(msm_host->clk);
> - clk_disable_unprepare(msm_host->pclk);
> + clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
> + msm_host->bulk_clks);
> if (!IS_ERR(msm_host->bus_clk))
> clk_disable_unprepare(msm_host->bus_clk);
> sdhci_pltfm_free(pdev);
> @@ -1329,8 +1329,8 @@ static int sdhci_msm_runtime_suspend(struct device *dev)
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
>
> - clk_disable_unprepare(msm_host->clk);
> - clk_disable_unprepare(msm_host->pclk);
> + clk_bulk_disable_unprepare(ARRAY_SIZE(msm_host->bulk_clks),
> + msm_host->bulk_clks);
>
> return 0;
> }
> @@ -1340,21 +1340,9 @@ static int sdhci_msm_runtime_resume(struct device *dev)
> struct sdhci_host *host = dev_get_drvdata(dev);
> struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
> - int ret;
>
> - ret = clk_prepare_enable(msm_host->clk);
> - if (ret) {
> - dev_err(dev, "clk_enable failed for core_clk: %d\n", ret);
> - return ret;
> - }
> - ret = clk_prepare_enable(msm_host->pclk);
> - if (ret) {
> - dev_err(dev, "clk_enable failed for iface_clk: %d\n", ret);
> - clk_disable_unprepare(msm_host->clk);
> - return ret;
> - }
> -
> - return 0;
> + return clk_bulk_prepare_enable(ARRAY_SIZE(msm_host->bulk_clks),
> + msm_host->bulk_clks);
> }
> #endif
>
> --
> 2.12.0
>
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