linux-kernel - [“PATCH” 1/2] mmc: sdhci-of-arasan: Use clock-frequency property to update clk

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Date:   Thu,  3 Jun 2021 23:52:41 +0530
From:   rashmi.a@...el.com
To:     linux-drivers-review-request@...ists.intel.com,
        michal.simek@...inx.com, ulf.hansson@...aro.org,
        linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, kishon@...com, vkoul@...nel.org,
        andriy.shevchenko@...ux.intel.com, linux-phy@...ts.infradead.org
Cc:     mgross@...ux.intel.com, kris.pan@...ux.intel.com,
        furong.zhou@...el.com, mallikarjunappa.sangannavar@...el.com,
        adrian.hunter@...el.com, mahesh.r.vaidya@...el.com,
        nandhini.srikandan@...el.com,
        lakshmi.bai.raja.subramanian@...el.com, rashmi.a@...el.com
Subject: [“PATCH” 1/2] mmc: sdhci-of-arasan: Use clock-frequency property to update clk_xin

From: Rashmi A <rashmi.a@...el.com>

If clock-frequency property is set and it is not the same as the current
clock rate of clk_xin(base clock frequency), set clk_xin to use the
provided clock rate.

Signed-off-by: Rashmi A <rashmi.a@...el.com>
Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/mmc/host/sdhci-of-arasan.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
index 839965f7c717..0e7c07ed9690 100644
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -1542,6 +1542,8 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 		}
 	}
 
+	sdhci_get_of_property(pdev);
+
 	sdhci_arasan->clk_ahb = devm_clk_get(dev, "clk_ahb");
 	if (IS_ERR(sdhci_arasan->clk_ahb)) {
 		ret = dev_err_probe(dev, PTR_ERR(sdhci_arasan->clk_ahb),
@@ -1561,14 +1563,22 @@ static int sdhci_arasan_probe(struct platform_device *pdev)
 		goto err_pltfm_free;
 	}
 
+	/* If clock-frequency property is set, use the provided value */
+	if (pltfm_host->clock &&
+	    pltfm_host->clock != clk_get_rate(clk_xin)) {
+		ret = clk_set_rate(clk_xin, pltfm_host->clock);
+		if (ret) {
+			dev_err(&pdev->dev, "Failed to set SD clock rate\n");
+			goto clk_dis_ahb;
+		}
+	}
+
 	ret = clk_prepare_enable(clk_xin);
 	if (ret) {
 		dev_err(dev, "Unable to enable SD clock.\n");
 		goto clk_dis_ahb;
 	}
 
-	sdhci_get_of_property(pdev);
-
 	if (of_property_read_bool(np, "xlnx,fails-without-test-cd"))
 		sdhci_arasan->quirks |= SDHCI_ARASAN_QUIRK_FORCE_CDTEST;
 
-- 
2.17.1