linux-kernel - [PATCH 1/3] mmc: sdhci-pci-gli: Reduce the SSC value at 205MHz for GL9750 and GL9755

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Message-Id: <20220119075306.36262-1-benchuanggli@gmail.com>
Date:   Wed, 19 Jan 2022 15:53:06 +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 1/3] mmc: sdhci-pci-gli: Reduce the SSC value at 205MHz for GL9750 and GL9755

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

The SSC value is 0xFFE7 at 205MHz and may be saturated. Reduce the SSC
value to 0x5A1D at 205MHz to reduce this situation for GL9750 and GL9755.

Signed-off-by: Ben Chuang <ben.chuang@...esyslogic.com.tw>
---
 drivers/mmc/host/sdhci-pci-gli.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-pci-gli.c b/drivers/mmc/host/sdhci-pci-gli.c
index 4fd99c1e82ba..9ead32d73447 100644
--- a/drivers/mmc/host/sdhci-pci-gli.c
+++ b/drivers/mmc/host/sdhci-pci-gli.c
@@ -390,7 +390,7 @@ static void gl9750_set_ssc(struct sdhci_host *host, u8 enable, u8 step, u16 ppm)
 static void gl9750_set_ssc_pll_205mhz(struct sdhci_host *host)
 {
 	/* set pll to 205MHz and enable ssc */
-	gl9750_set_ssc(host, 0x1, 0x1F, 0xFFE7);
+	gl9750_set_ssc(host, 0x1, 0xF, 0x5A1D);
 	gl9750_set_pll(host, 0x1, 0x246, 0x0);
 }
 
@@ -533,7 +533,7 @@ static void gl9755_set_ssc(struct pci_dev *pdev, u8 enable, u8 step, u16 ppm)
 static void gl9755_set_ssc_pll_205mhz(struct pci_dev *pdev)
 {
 	/* set pll to 205MHz and enable ssc */
-	gl9755_set_ssc(pdev, 0x1, 0x1F, 0xFFE7);
+	gl9755_set_ssc(pdev, 0x1, 0xF, 0x5A1D);
 	gl9755_set_pll(pdev, 0x1, 0x246, 0x0);
 }
 
-- 
2.34.1