openwrt/target/linux/layerscape/patches-5.4/816-sdhc-0002-LF-605-mmc-sdhci-of-esdhc-convert-to-use-esdhc_tunin.patch

From e95c04bd6d9ebe081126184fb228461b1b3fa7aa Mon Sep 17 00:00:00 2001
From: Yangbo Lu <yangbo.lu@nxp.com>
Date: Thu, 12 Dec 2019 15:52:18 +0800
Subject: [PATCH] LF-605 mmc: sdhci-of-esdhc: convert to use
 esdhc_tuning_window_ptr()

Convert to use a new function esdhc_tuning_window_ptr() to
get tuning window start point and end point.

Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-of-esdhc.c | 34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -924,20 +924,11 @@ static void esdhc_tuning_block_enable(st
 	esdhc_clock_enable(host, true);
 }
 
-static void esdhc_prepare_sw_tuning(struct sdhci_host *host, u8 *window_start,
+static void esdhc_tuning_window_ptr(struct sdhci_host *host, u8 *window_start,
 				    u8 *window_end)
 {
-	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
-	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
-	u8 tbstat_15_8, tbstat_7_0;
 	u32 val;
 
-	if (esdhc->quirk_tuning_erratum_type1) {
-		*window_start = 5 * esdhc->div_ratio;
-		*window_end = 3 * esdhc->div_ratio;
-		return;
-	}
-
 	/* Write TBCTL[11:8]=4'h8 */
 	val = sdhci_readl(host, ESDHC_TBCTL);
 	val &= ~(0xf << 8);
@@ -956,6 +947,25 @@ static void esdhc_prepare_sw_tuning(stru
 	val = sdhci_readl(host, ESDHC_TBSTAT);
 	val = sdhci_readl(host, ESDHC_TBSTAT);
 
+	*window_end = val & 0xff;
+	*window_start = (val >> 8) & 0xff;
+}
+
+static void esdhc_prepare_sw_tuning(struct sdhci_host *host, u8 *window_start,
+				    u8 *window_end)
+{
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
+	u8 start_ptr, end_ptr;
+
+	if (esdhc->quirk_tuning_erratum_type1) {
+		*window_start = 5 * esdhc->div_ratio;
+		*window_end = 3 * esdhc->div_ratio;
+		return;
+	}
+
+	esdhc_tuning_window_ptr(host, &start_ptr, &end_ptr);
+
 	/* Reset data lines by setting ESDHCCTL[RSTD] */
 	sdhci_reset(host, SDHCI_RESET_DATA);
 	/* Write 32'hFFFF_FFFF to IRQSTAT register */
@@ -966,10 +976,8 @@ static void esdhc_prepare_sw_tuning(stru
 	 * then program TBPTR[TB_WNDW_END_PTR] = 4 * div_ratio
 	 * and program TBPTR[TB_WNDW_START_PTR] = 8 * div_ratio.
 	 */
-	tbstat_7_0 = val & 0xff;
-	tbstat_15_8 = (val >> 8) & 0xff;
 
-	if (abs(tbstat_15_8 - tbstat_7_0) > (4 * esdhc->div_ratio)) {
+	if (abs(start_ptr - end_ptr) > (4 * esdhc->div_ratio)) {
 		*window_start = 8 * esdhc->div_ratio;
 		*window_end = 4 * esdhc->div_ratio;
 	} else {