Commit ebd88a38 authored by Baolin Wang's avatar Baolin Wang Committed by Ulf Hansson
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mmc: sdhci-sprd: Add optional gate clock support 



For the Spreadtrum SC9860 platform, we should enable another gate clock
'2x_enable' to make the SD host controller work well.

Signed-off-by: default avatarBaolin Wang <baolin.wang@linaro.org>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 334eb9bc

drivers/mmc/host/sdhci-sprd.c

+29 −6
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ struct sdhci_sprd_host { 
	u32 version;

	struct clk *clk_sdio;

	struct clk *clk_enable;

	struct clk *clk_2x_enable;

	u32 base_rate;

	int flags; /* backup of host attribute */

};
@@ -364,6 +365,10 @@ static int sdhci_sprd_probe(struct platform_device *pdev) 
	}

	sprd_host->clk_enable = clk;



	clk = devm_clk_get(&pdev->dev, "2x_enable");

	if (!IS_ERR(clk))

		sprd_host->clk_2x_enable = clk;



	ret = clk_prepare_enable(sprd_host->clk_sdio);

	if (ret)

		goto pltfm_free;
@@ -372,6 +377,10 @@ static int sdhci_sprd_probe(struct platform_device *pdev) 
	if (ret)

		goto clk_disable;



	ret = clk_prepare_enable(sprd_host->clk_2x_enable);

	if (ret)

		goto clk_disable2;



	sdhci_sprd_init_config(host);

	host->version = sdhci_readw(host, SDHCI_HOST_VERSION);

	sprd_host->version = ((host->version & SDHCI_VENDOR_VER_MASK) >>
@@ -408,6 +417,9 @@ pm_runtime_disable: 
	pm_runtime_disable(&pdev->dev);

	pm_runtime_set_suspended(&pdev->dev);



	clk_disable_unprepare(sprd_host->clk_2x_enable);



clk_disable2:

	clk_disable_unprepare(sprd_host->clk_enable);



clk_disable:
@@ -427,6 +439,7 @@ static int sdhci_sprd_remove(struct platform_device *pdev) 
	mmc_remove_host(mmc);

	clk_disable_unprepare(sprd_host->clk_sdio);

	clk_disable_unprepare(sprd_host->clk_enable);

	clk_disable_unprepare(sprd_host->clk_2x_enable);



	mmc_free_host(mmc);
@@ -449,6 +462,7 @@ static int sdhci_sprd_runtime_suspend(struct device *dev) 


	clk_disable_unprepare(sprd_host->clk_sdio);

	clk_disable_unprepare(sprd_host->clk_enable);

	clk_disable_unprepare(sprd_host->clk_2x_enable);



	return 0;

}
@@ -459,19 +473,28 @@ static int sdhci_sprd_runtime_resume(struct device *dev) 
	struct sdhci_sprd_host *sprd_host = TO_SPRD_HOST(host);

	int ret;



	ret = clk_prepare_enable(sprd_host->clk_enable);

	ret = clk_prepare_enable(sprd_host->clk_2x_enable);

	if (ret)

		return ret;



	ret = clk_prepare_enable(sprd_host->clk_enable);

	if (ret)

		goto clk_2x_disable;



	ret = clk_prepare_enable(sprd_host->clk_sdio);

	if (ret) {

		clk_disable_unprepare(sprd_host->clk_enable);

		return ret;

	}

	if (ret)

		goto clk_disable;



	sdhci_runtime_resume_host(host);



	return 0;



clk_disable:

	clk_disable_unprepare(sprd_host->clk_enable);



clk_2x_disable:

	clk_disable_unprepare(sprd_host->clk_2x_enable);



	return ret;

}

#endif

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