linux-kernel - [RFC PATCH 02/13] drivers: mmc: host: sdhci

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Date: Tue, 30 Jan 2024 18:37:03 -0600
From: Judith Mendez <jm@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>
CC: Adrian Hunter <adrian.hunter@...el.com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, Nishanth Menon <nm@...com>,
        Vignesh
 Raghavendra <vigneshr@...com>, Andrew Davis <afd@...com>,
        Udit Kumar
	<u-kumar1@...com>, Roger Quadros <rogerq@...nel.org>,
        <devicetree@...r.kernel.org>, Randolph Sapp <rs@...com>
Subject: [RFC PATCH 02/13] drivers: mmc: host: sdhci_am654: Write ITAPDLY for DDR52 timing

For DDR52 timing, DLL is enabled but tuning is not carried
out, therefore the ITAPDLY value in PHY CTRL 4 register is
not correct. Fix this by writing ITAPDLY after enabling DLL.

Signed-off-by: Judith Mendez <jm@...com>
---
 drivers/mmc/host/sdhci_am654.c | 27 +++++++++++++++------------
 1 file changed, 15 insertions(+), 12 deletions(-)

diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 59d205511312..0a1ed2ae2eef 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -170,7 +170,19 @@ struct sdhci_am654_driver_data {
 #define DLL_CALIB	(1 << 4)
 };
 
-static void sdhci_am654_setup_dll(struct sdhci_host *host, unsigned int clock)
+static void sdhci_am654_write_itapdly(struct sdhci_am654_data *sdhci_am654,
+				      u32 itapdly)
+{
+	/* Set ITAPCHGWIN before writing to ITAPDLY */
+	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK,
+			   0x1 << ITAPCHGWIN_SHIFT);
+	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYSEL_MASK,
+			   itapdly << ITAPDLYSEL_SHIFT);
+	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0);
+}
+
+static void sdhci_am654_setup_dll(struct sdhci_host *host, unsigned int clock,
+				  unsigned char timing)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
@@ -236,17 +248,8 @@ static void sdhci_am654_setup_dll(struct sdhci_host *host, unsigned int clock)
 		dev_err(mmc_dev(host->mmc), "DLL failed to relock\n");
 		return;
 	}
-}
 
-static void sdhci_am654_write_itapdly(struct sdhci_am654_data *sdhci_am654,
-				      u32 itapdly)
-{
-	/* Set ITAPCHGWIN before writing to ITAPDLY */
-	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK,
-			   1 << ITAPCHGWIN_SHIFT);
-	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPDLYSEL_MASK,
-			   itapdly << ITAPDLYSEL_SHIFT);
-	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, ITAPCHGWIN_MASK, 0);
+	sdhci_am654_write_itapdly(sdhci_am654, sdhci_am654->itap_del_sel[timing]);
 }
 
 static void sdhci_am654_setup_delay_chain(struct sdhci_am654_data *sdhci_am654,
@@ -298,7 +301,7 @@ static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 	regmap_update_bits(sdhci_am654->base, PHY_CTRL4, mask, val);
 
 	if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) {
-		sdhci_am654_setup_dll(host, clock);
+		sdhci_am654_setup_dll(host, clock, timing);
 		sdhci_am654->dll_enable = true;
 	} else {
 		sdhci_am654_setup_delay_chain(sdhci_am654, timing);
-- 
2.34.1