This is a note to let you know that I've just added the patch titled
mmc: sdhci-of-arasan: Issue DLL reset explicitly
to the 5.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-sdhci-of-arasan-issue-dll-reset-explicitly.patch
and it can be found in the queue-5.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d06d60d52ec0b0eef702dd3e7b4699f0b589ad0f Mon Sep 17 00:00:00 2001
From: Manish Narani <manish.narani@xxxxxxxxxx>
Date: Mon, 16 Nov 2020 14:02:45 +0530
Subject: mmc: sdhci-of-arasan: Issue DLL reset explicitly
From: Manish Narani <manish.narani@xxxxxxxxxx>
commit d06d60d52ec0b0eef702dd3e7b4699f0b589ad0f upstream.
In the current implementation DLL reset will be issued for
each ITAP and OTAP setting inside ATF, this is creating issues
in some scenarios and this sequence is not inline with the TRM.
To fix the issue, DLL reset should be removed from the ATF and
host driver will request it explicitly.
This patch update host driver to explicitly request for DLL reset
before ITAP (assert DLL) and after OTAP (release DLL) settings.
Fixes: a5c8b2ae2e51 ("mmc: sdhci-of-arasan: Add support for ZynqMP Platform Tap Delays Setup")
Signed-off-by: Sai Krishna Potthuri <lakshmi.sai.krishna.potthuri@xxxxxxxxxx>
Signed-off-by: Manish Narani <manish.narani@xxxxxxxxxx>
Acked-by: Michal Simek <michal.simek@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/1605515565-117562-4-git-send-email-manish.narani@xxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-of-arasan.c | 6 ++++++
1 file changed, 6 insertions(+)
--- a/drivers/mmc/host/sdhci-of-arasan.c
+++ b/drivers/mmc/host/sdhci-of-arasan.c
@@ -635,6 +635,9 @@ static int sdhci_zynqmp_sdcardclk_set_ph
if (ret)
pr_err("Error setting Output Tap Delay\n");
+ /* Release DLL Reset */
+ zynqmp_pm_sd_dll_reset(node_id, PM_DLL_RESET_RELEASE);
+
return ret;
}
@@ -669,6 +672,9 @@ static int sdhci_zynqmp_sampleclk_set_ph
if (host->version < SDHCI_SPEC_300)
return 0;
+ /* Assert DLL Reset */
+ zynqmp_pm_sd_dll_reset(node_id, PM_DLL_RESET_ASSERT);
+
switch (host->timing) {
case MMC_TIMING_MMC_HS:
case MMC_TIMING_SD_HS:
Patches currently in stable-queue which might be from manish.narani@xxxxxxxxxx are
queue-5.9/mmc-sdhci-of-arasan-use-mask-writes-for-tap-delays.patch
queue-5.9/mmc-sdhci-of-arasan-issue-dll-reset-explicitly.patch
queue-5.9/mmc-sdhci-of-arasan-allow-configuring-zero-tap-values.patch
