linux-kernel - [PATCH v4 7/7] mmc: sdhci_am654: Fix ITAPDLY for HS400 timing

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Message-ID: <20240318191143.27638-8-jm@ti.com>
Date: Mon, 18 Mar 2024 14:11:42 -0500
From: Judith Mendez <jm@...com>
To: Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter
	<adrian.hunter@...el.com>
CC: Andrew Davis <afd@...com>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v4 7/7] mmc: sdhci_am654: Fix ITAPDLY for HS400 timing

While STRB is currently used for DATA and CRC responses, the CMD
responses from the device to the host still require ITAPDLY for
HS400 timing.

Currently what is stored for HS400 is the ITAPDLY from High Speed
mode which is incorrect. The ITAPDLY for HS400 speed mode should
be the same as ITAPDLY as HS200 timing after tuning is executed.
Add the functionality to save ITAPDLY from HS200 tuning and save
as HS400 ITAPDLY.

Fixes: a161c45f2979 ("mmc: sdhci_am654: Enable DLL only for some speed modes")
Signed-off-by: Judith Mendez <jm@...com>
Acked-by: Adrian Hunter <adrian.hunter@...el.com>
---
Changelog:
v3->v4:
- Add acked-by
---
 drivers/mmc/host/sdhci_am654.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
index 887808db830f..f9bd27c09fc7 100644
--- a/drivers/mmc/host/sdhci_am654.c
+++ b/drivers/mmc/host/sdhci_am654.c
@@ -301,6 +301,12 @@ static void sdhci_am654_set_clock(struct sdhci_host *host, unsigned int clock)
 	if (timing > MMC_TIMING_UHS_SDR25 && clock >= CLOCK_TOO_SLOW_HZ) {
 		sdhci_am654_setup_dll(host, clock);
 		sdhci_am654->dll_enable = true;
+
+		if (timing == MMC_TIMING_MMC_HS400) {
+			sdhci_am654->itap_del_ena[timing] = 0x1;
+			sdhci_am654->itap_del_sel[timing] = sdhci_am654->itap_del_sel[timing - 1];
+		}
+
 		sdhci_am654_write_itapdly(sdhci_am654, sdhci_am654->itap_del_sel[timing],
 					  sdhci_am654->itap_del_ena[timing]);
 	} else {
@@ -530,6 +536,9 @@ static int sdhci_am654_platform_execute_tuning(struct sdhci_host *host,
 
 	sdhci_am654_write_itapdly(sdhci_am654, itap, sdhci_am654->itap_del_ena[timing]);
 
+	/* Save ITAPDLY */
+	sdhci_am654->itap_del_sel[timing] = itap;
+
 	return 0;
 }
 
-- 
2.43.2