[PATCH 6.9 152/374] mmc: sdhci_am654: Fix ITAPDLY for HS400 timing

Greg Kroah-Hartman
2024-06-06T14:09:35Z

From: Judith Mendez <jm@ti.com>

[ Upstream commit d3182932bb070e7518411fd165e023f82afd7d25 ]

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>
Link: https://lore.kernel.org/r/20240320223837.959900-8-jm@ti.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
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 884d1b53180d7..562034af653eb 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 {
@@ -531,6 +537,9 @@ 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;
}

--
2.43.0