diff mbox series

[V2] mmc: sdhci-of_dwcmshc: Change to dwcmshc_phy_init for reusing codes

Message ID 20241216105127.2180403-1-jh80.chung@samsung.com (mailing list archive)
State New
Headers show
Series [V2] mmc: sdhci-of_dwcmshc: Change to dwcmshc_phy_init for reusing codes | expand

Commit Message

Jaehoon Chung Dec. 16, 2024, 10:51 a.m. UTC 
dwcmshc_phy_1_8v_init and dwcmshc_phy_3_3v_init differ only by a few
lines of code. This allow us to reuse code depending on voltage.

Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
---
Changelog V2:
- Add more conditions to clarify if it's MMC_SIGNAL_VOLTAGE_180
- Order the local variable according to Adrian's comment
- Use local variable to make more readable
---
 drivers/mmc/host/sdhci-of-dwcmshc.c | 75 +++++++----------------------
 1 file changed, 18 insertions(+), 57 deletions(-)
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci-of-dwcmshc.c b/drivers/mmc/host/sdhci-of-dwcmshc.c
index 7ea3da45db32..08a9b963fb1a 100644
--- a/drivers/mmc/host/sdhci-of-dwcmshc.c
+++ b/drivers/mmc/host/sdhci-of-dwcmshc.c
@@ -328,12 +328,18 @@  static void dwcmshc_request(struct mmc_host *mmc, struct mmc_request *mrq)
 	sdhci_request(mmc, mrq);
 }
 
-static void dwcmshc_phy_1_8v_init(struct sdhci_host *host)
+static void dwcmshc_phy_init(struct sdhci_host *host)
 {
 	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
 	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
+	u32 rxsel = PHY_PAD_RXSEL_3V3;
 	u32 val;
 
+	if (priv->flags & FLAG_IO_FIXED_1V8 ||
+		(host->mmc->ios.timing & MMC_SIGNAL_VOLTAGE_180 &&
+		 host->flags & SDHCI_SIGNALING_180))
+		rxsel = PHY_PAD_RXSEL_1V8;
+
 	/* deassert phy reset & set tx drive strength */
 	val = PHY_CNFG_RSTN_DEASSERT;
 	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
@@ -353,7 +359,7 @@  static void dwcmshc_phy_1_8v_init(struct sdhci_host *host)
 	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
 
 	/* configure phy pads */
-	val = PHY_PAD_RXSEL_1V8;
+	val = rxsel;
 	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
 	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
 	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
@@ -365,65 +371,24 @@  static void dwcmshc_phy_1_8v_init(struct sdhci_host *host)
 	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
 	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
 
-	val = PHY_PAD_RXSEL_1V8;
+	val = rxsel;
 	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
 	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
 	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
 	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
 
 	/* enable data strobe mode */
-	sdhci_writeb(host, FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL),
-		     PHY_DLLDL_CNFG_R);
-
-	/* enable phy dll */
-	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
-}
-
-static void dwcmshc_phy_3_3v_init(struct sdhci_host *host)
-{
-	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
-	struct dwcmshc_priv *priv = sdhci_pltfm_priv(pltfm_host);
-	u32 val;
-
-	/* deassert phy reset & set tx drive strength */
-	val = PHY_CNFG_RSTN_DEASSERT;
-	val |= FIELD_PREP(PHY_CNFG_PAD_SP_MASK, PHY_CNFG_PAD_SP);
-	val |= FIELD_PREP(PHY_CNFG_PAD_SN_MASK, PHY_CNFG_PAD_SN);
-	sdhci_writel(host, val, PHY_CNFG_R);
-
-	/* disable delay line */
-	sdhci_writeb(host, PHY_SDCLKDL_CNFG_UPDATE, PHY_SDCLKDL_CNFG_R);
-
-	/* set delay line */
-	sdhci_writeb(host, priv->delay_line, PHY_SDCLKDL_DC_R);
-	sdhci_writeb(host, PHY_DLL_CNFG2_JUMPSTEP, PHY_DLL_CNFG2_R);
-
-	/* enable delay lane */
-	val = sdhci_readb(host, PHY_SDCLKDL_CNFG_R);
-	val &= ~(PHY_SDCLKDL_CNFG_UPDATE);
-	sdhci_writeb(host, val, PHY_SDCLKDL_CNFG_R);
+	if (priv->flags & FLAG_IO_FIXED_1V8 ||
+		(host->mmc->ios.timing & MMC_SIGNAL_VOLTAGE_180 &&
+		 host->flags & SDHCI_SIGNALING_180)) {
+		u8 sel = FIELD_PREP(PHY_DLLDL_CNFG_SLV_INPSEL_MASK, PHY_DLLDL_CNFG_SLV_INPSEL);
 
-	/* configure phy pads */
-	val = PHY_PAD_RXSEL_3V3;
-	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLUP);
-	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
-	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
-	sdhci_writew(host, val, PHY_CMDPAD_CNFG_R);
-	sdhci_writew(host, val, PHY_DATAPAD_CNFG_R);
-	sdhci_writew(host, val, PHY_RSTNPAD_CNFG_R);
-
-	val = FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
-	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
-	sdhci_writew(host, val, PHY_CLKPAD_CNFG_R);
-
-	val = PHY_PAD_RXSEL_3V3;
-	val |= FIELD_PREP(PHY_PAD_WEAKPULL_MASK, PHY_PAD_WEAKPULL_PULLDOWN);
-	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_P_MASK, PHY_PAD_TXSLEW_CTRL_P);
-	val |= FIELD_PREP(PHY_PAD_TXSLEW_CTRL_N_MASK, PHY_PAD_TXSLEW_CTRL_N);
-	sdhci_writew(host, val, PHY_STBPAD_CNFG_R);
+		sdhci_writeb(host, sel, PHY_DLLDL_CNFG_R);
+	}
 
 	/* enable phy dll */
 	sdhci_writeb(host, PHY_DLL_CTRL_ENABLE, PHY_DLL_CTRL_R);
+
 }
 
 static void th1520_sdhci_set_phy(struct sdhci_host *host)
@@ -433,11 +398,7 @@  static void th1520_sdhci_set_phy(struct sdhci_host *host)
 	u32 emmc_caps = MMC_CAP2_NO_SD | MMC_CAP2_NO_SDIO;
 	u16 emmc_ctrl;
 
-	/* Before power on, set PHY configs */
-	if (priv->flags & FLAG_IO_FIXED_1V8)
-		dwcmshc_phy_1_8v_init(host);
-	else
-		dwcmshc_phy_3_3v_init(host);
+	dwcmshc_phy_init(host);
 
 	if ((host->mmc->caps2 & emmc_caps) == emmc_caps) {
 		emmc_ctrl = sdhci_readw(host, priv->vendor_specific_area1 + DWCMSHC_EMMC_CONTROL);
@@ -1163,7 +1124,7 @@  static const struct sdhci_ops sdhci_dwcmshc_th1520_ops = {
 	.get_max_clock		= dwcmshc_get_max_clock,
 	.reset			= th1520_sdhci_reset,
 	.adma_write_desc	= dwcmshc_adma_write_desc,
-	.voltage_switch		= dwcmshc_phy_1_8v_init,
+	.voltage_switch		= dwcmshc_phy_init,
 	.platform_execute_tuning = th1520_execute_tuning,
 };