Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
IronPort-SDR: CzCQIv9oEukAEsKzjsMUafIgRPRN8BQNU9w13gTnEP9KNA2vdKqsW2aHz0nmLEjTF9Xf02Qi0p
 O8xzcygyScUw==
IronPort-SDR: cYBAxOZcDF9xlY6icljnyITeKlTh5nZ6LDxGSPBDxMzt+DDQ6GzKjE57deaB00G9OORiewQLvy
 CTq2bW/3vf5Q==
From:   rashmi.a@intel.com
To:     linux-drivers-review-request@eclists.intel.com,
        michal.simek@xilinx.com, ulf.hansson@linaro.org,
        linux-mmc@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, kishon@ti.com, vkoul@kernel.org,
        andriy.shevchenko@linux.intel.com, linux-phy@lists.infradead.org
Cc:     mgross@linux.intel.com, kris.pan@linux.intel.com,
        furong.zhou@intel.com, mallikarjunappa.sangannavar@intel.com,
        adrian.hunter@intel.com, mahesh.r.vaidya@intel.com,
        nandhini.srikandan@intel.com,
        lakshmi.bai.raja.subramanian@intel.com, rashmi.a@intel.com
Subject: =?utf-8?q?=5B=E2=80=9CPATCH=E2=80=9D=201/2=5D=20mmc=3A=20sdhci-of-arasan=3A=20Use=20clock-frequency=20property=20to=20update=20clk=5Fxin?=
Date:   Thu,  3 Jun 2021 23:52:41 +0530
Message-Id: <20210603182242.25733-2-rashmi.a@intel.com>
In-Reply-To: <20210603182242.25733-1-rashmi.a@intel.com>
References: <20210603182242.25733-1-rashmi.a@intel.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Precedence: bulk

From: Rashmi A <rashmi.a@intel.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@intel.com>
Reviewed-by: Adrian Hunter <adrian.hunter@intel.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