linux-kernel - [PATCH 2/3] mmc: sdhci-pci-gli: Enable SSC at 50MHz and 100MHz for GL9750 and GL9755

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Date:   Wed, 19 Jan 2022 15:53:39 +0800
From:   Ben Chuang <benchuanggli@...il.com>
To:     adrian.hunter@...el.com, ulf.hansson@...aro.org
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        greg.tu@...esyslogic.com.tw, ben.chuang@...esyslogic.com.tw,
        SeanHY.Chen@...esyslogic.com.tw,
        Ben Chuang <benchuanggli@...il.com>
Subject: [PATCH 2/3] mmc: sdhci-pci-gli: Enable SSC at 50MHz and 100MHz for GL9750 and GL9755

From: Ben Chuang <ben.chuang@...esyslogic.com.tw>

Enable SSC function at 50MHz and 100MHz for GL9750 and GL9755.

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
---
 drivers/mmc/host/sdhci-pci-gli.c | 36 ++++++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 9ead32d73447..9de3d91283af 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -394,6 +394,20 @@ static void gl9750_set_ssc_pll_205mhz(struct sdhci_host *host)
 	gl9750_set_pll(host, 0x1, 0x246, 0x0);
 }
 
+static void gl9750_set_ssc_pll_100mhz(struct sdhci_host *host)
+{
+	/* set pll to 100MHz and enable ssc */
+	gl9750_set_ssc(host, 0x1, 0xE, 0x51EC);
+	gl9750_set_pll(host, 0x1, 0x244, 0x1);
+}
+
+static void gl9750_set_ssc_pll_50mhz(struct sdhci_host *host)
+{
+	/* set pll to 50MHz and enable ssc */
+	gl9750_set_ssc(host, 0x1, 0xE, 0x51EC);
+	gl9750_set_pll(host, 0x1, 0x244, 0x3);
+}
+
 static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct mmc_ios *ios = &host->mmc->ios;
@@ -411,6 +425,10 @@ static void sdhci_gl9750_set_clock(struct sdhci_host *host, unsigned int clock)
 	if (clock == 200000000 && ios->timing == MMC_TIMING_UHS_SDR104) {
 		host->mmc->actual_clock = 205000000;
 		gl9750_set_ssc_pll_205mhz(host);
+	} else if (clock == 100000000) {
+		gl9750_set_ssc_pll_100mhz(host);
+	} else if (clock == 50000000) {
+		gl9750_set_ssc_pll_50mhz(host);
 	}
 
 	sdhci_enable_clk(host, clk);
@@ -537,6 +555,20 @@ static void gl9755_set_ssc_pll_205mhz(struct pci_dev *pdev)
 	gl9755_set_pll(pdev, 0x1, 0x246, 0x0);
 }
 
+static void gl9755_set_ssc_pll_100mhz(struct pci_dev *pdev)
+{
+	/* set pll to 100MHz and enable ssc */
+	gl9755_set_ssc(pdev, 0x1, 0xE, 0x51EC);
+	gl9755_set_pll(pdev, 0x1, 0x244, 0x1);
+}
+
+static void gl9755_set_ssc_pll_50mhz(struct pci_dev *pdev)
+{
+	/* set pll to 50MHz and enable ssc */
+	gl9755_set_ssc(pdev, 0x1, 0xE, 0x51EC);
+	gl9755_set_pll(pdev, 0x1, 0x244, 0x3);
+}
+
 static void sdhci_gl9755_set_clock(struct sdhci_host *host, unsigned int clock)
 {
 	struct sdhci_pci_slot *slot = sdhci_priv(host);
@@ -557,6 +589,10 @@ static void sdhci_gl9755_set_clock(struct sdhci_host *host, unsigned int clock)
 	if (clock == 200000000 && ios->timing == MMC_TIMING_UHS_SDR104) {
 		host->mmc->actual_clock = 205000000;
 		gl9755_set_ssc_pll_205mhz(pdev);
+	} else if (clock == 100000000) {
+		gl9755_set_ssc_pll_100mhz(pdev);
+	} else if (clock == 50000000) {
+		gl9755_set_ssc_pll_50mhz(pdev);
 	}
 
 	sdhci_enable_clk(host, clk);
-- 
2.34.1