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mmc: sdhci-of-dwcmshc: disable internal clock auto gate

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With CMDQ enabled, issuing a DCMD as the last command before disabling
CMDQ causes the eMMC controller to auto-gate its internal clock. The
state machine mismatch after exiting CMDQ mode triggers data-timeout
errors on all subsequent reads and writes, so the auto-clock-gate
function must be disabled whenever CMDQ is enabled.

log:
mmc2: Timeout waiting for hardware interrupt.
mmc2: sdhci: ============ SDHCI REGISTER DUMP ===========
mmc2: sdhci: Sys addr:  0x00000001 | Version:  0x00000005
mmc2: sdhci: Blk size:  0x00007200 | Blk cnt:  0x00000000

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Change-Id: Ibafa74fc2db29b841b5b4df21ef484478f96a44e
This commit is contained in:
Yifeng Zhao
2025-08-13 10:01:51 +08:00
committed by Tao Huang
parent 61c710bab1
commit ff538ea7f5
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/host/sdhci-of-dwcmshc.c
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@@ -421,10 +421,11 @@ static void dwcmshc_rk3568_set_clock(struct sdhci_host *host, unsigned int clock
sdhci_set_clock(host, clock);
/* Disable cmd conflict check */
/* Disable cmd conflict check and disable internal clock gate */
reg = dwc_priv->vendor_specific_area1 + DWCMSHC_HOST_CTRL3;
extra = sdhci_readl(host, reg);
extra &= ~BIT(0);
extra |= BIT(4);
sdhci_writel(host, extra, reg);
/* Disable output clock while config DLL */