diff mbox series

[v4,7/7] mmc: sdhci_am654: Fix ITAPDLY for HS400 timing

Message ID 20240318191143.27638-8-jm@ti.com
State Superseded
Headers show
Series Add tuning algorithm for delay chain | expand

Commit Message

Judith Mendez March 18, 2024, 7:11 p.m. UTC 
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@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
Changelog:
v3->v4:
- Add acked-by
---
 drivers/mmc/host/sdhci_am654.c | 9 +++++++++
 1 file changed, 9 insertions(+)
diff mbox series

Patch

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;
 }