[3/9] mmc: sdhci-sprd: Add optional gate clock support
diff mbox series

Message ID 16b895cf30c235dc656eeed5888069b6266ab5f8.1558346019.git.baolin.wang@linaro.org
State New
Headers show
Series
  • Add SD host controller support for SC9860 platform
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Commit Message

Baolin Wang May 20, 2019, 10:11 a.m. UTC
For the Spreadtrum SC9860 platform, we should enable another gate clock
'2x_enable' to make the SD host controller work well.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
---
 drivers/mmc/host/sdhci-sprd.c |   35 +++++++++++++++++++++++++++++------
 1 file changed, 29 insertions(+), 6 deletions(-)

Comments

Adrian Hunter June 3, 2019, 12:20 p.m. UTC | #1
On 20/05/19 1:11 PM, Baolin Wang wrote:
> For the Spreadtrum SC9860 platform, we should enable another gate clock
> '2x_enable' to make the SD host controller work well.
> 
> Signed-off-by: Baolin Wang <baolin.wang@linaro.org>

Acked-by: Adrian Hunter <adrian.hunter@intel.com>

> ---
>  drivers/mmc/host/sdhci-sprd.c |   35 +++++++++++++++++++++++++++++------
>  1 file changed, 29 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
> index e741491..31ba7d6 100644
> --- a/drivers/mmc/host/sdhci-sprd.c
> +++ b/drivers/mmc/host/sdhci-sprd.c
> @@ -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 @@ static int sdhci_sprd_probe(struct platform_device *pdev)
>  	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
>  
>

Patch
diff mbox series

diff --git a/drivers/mmc/host/sdhci-sprd.c b/drivers/mmc/host/sdhci-sprd.c
index e741491..31ba7d6 100644
--- a/drivers/mmc/host/sdhci-sprd.c
+++ b/drivers/mmc/host/sdhci-sprd.c
@@ -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 @@  static int sdhci_sprd_probe(struct platform_device *pdev)
 	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