c06fb25d1f
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47 lines
1.5 KiB
Diff
47 lines
1.5 KiB
Diff
From fe98179e184bdb0ff7061d1a026f82b749854720 Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Tue, 26 Mar 2024 13:17:10 +0000
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Subject: [PATCH 0993/1085] drivers: mmc: cqhci: clear CQHCI_CTL if halt fails
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The eMMC spec says that in certain circumstances the controller can't
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respond to a halt request - in practice, this occurs if a CMD
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timeout happens (card went away/crashed).
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Clear the halt request by writing 0 to CQHCI_CTL. Also fix a logic error
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testing for halt in cqhci_request.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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drivers/mmc/host/cqhci-core.c | 13 +++++++++----
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1 file changed, 9 insertions(+), 4 deletions(-)
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--- a/drivers/mmc/host/cqhci-core.c
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+++ b/drivers/mmc/host/cqhci-core.c
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@@ -383,9 +383,11 @@ static void cqhci_off(struct mmc_host *m
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err = readx_poll_timeout(cqhci_read_ctl, cq_host, reg,
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reg & CQHCI_HALT, 0, CQHCI_OFF_TIMEOUT);
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- if (err < 0)
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+ if (err < 0) {
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pr_err("%s: cqhci: CQE stuck on\n", mmc_hostname(mmc));
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- else
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+ /* eMMC v5.1 B.2.8 recommends writing 0 to CQHCI_CTL if stuck */
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+ cqhci_writel(cq_host, 0, CQHCI_CTL);
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+ } else
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pr_debug("%s: cqhci: CQE off\n", mmc_hostname(mmc));
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if (cq_host->ops->post_disable)
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@@ -975,8 +977,11 @@ static bool cqhci_halt(struct mmc_host *
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ret = cqhci_halted(cq_host);
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- if (!ret)
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+ if (!ret) {
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pr_warn("%s: cqhci: Failed to halt\n", mmc_hostname(mmc));
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+ /* eMMC v5.1 B.2.8 recommends writing 0 to CQHCI_CTL if stuck */
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+ cqhci_writel(cq_host, 0, CQHCI_CTL);
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+ }
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return ret;
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}
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