linux-kernel - [PATCH V2 2/6] mmc: cqhci: Increase recovery halt timeout

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Message-Id: <20231103084720.6886-3-adrian.hunter@intel.com>
Date:   Fri,  3 Nov 2023 10:47:16 +0200
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Kornel Dulęba <korneld@...omium.org>,
        Radoslaw Biernacki <biernacki@...gle.com>,
        Gwendal Grignou <gwendal@...omium.org>,
        Asutosh Das <quic_asutoshd@...cinc.com>
Cc:     Chaotian Jing <chaotian.jing@...iatek.com>,
        Bhavya Kapoor <b-kapoor@...com>,
        Kamal Dasu <kamal.dasu@...adcom.com>,
        Al Cooper <alcooperx@...il.com>,
        Haibo Chen <haibo.chen@....com>,
        Shaik Sajida Bhanu <quic_c_sbhanu@...cinc.com>,
        Sai Krishna Potthuri <sai.krishna.potthuri@....com>,
        Victor Shih <victor.shih@...esyslogic.com.tw>,
        Ben Chuang <ben.chuang@...esyslogic.com.tw>,
        Thierry Reding <thierry.reding@...il.com>,
        Aniruddha Tvs Rao <anrao@...dia.com>,
        Chun-Hung Wu <chun-hung.wu@...iatek.com>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH V2 2/6] mmc: cqhci: Increase recovery halt timeout

Failing to halt complicates the recovery. Additionally, unless the card or
controller are stuck, which is expected to be very rare, then the halt
should succeed, so it is better to wait. Set a large timeout.

Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
Cc: stable@...r.kernel.org
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/mmc/host/cqhci-core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b3d7d6d8d654..15f5a069af1f 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -984,10 +984,10 @@ static bool cqhci_halt(struct mmc_host *mmc, unsigned int timeout)
 /*
  * After halting we expect to be able to use the command line. We interpret the
  * failure to halt to mean the data lines might still be in use (and the upper
- * layers will need to send a STOP command), so we set the timeout based on a
- * generous command timeout.
+ * layers will need to send a STOP command), however failing to halt complicates
+ * the recovery, so set a timeout that would reasonably allow I/O to complete.
  */
-#define CQHCI_START_HALT_TIMEOUT	5
+#define CQHCI_START_HALT_TIMEOUT	500
 
 static void cqhci_recovery_start(struct mmc_host *mmc)
 {
-- 
2.34.1