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mmc: dw_mmc: allow biu and ciu clocks to defer

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BugLink: https://bugs.launchpad.net/bugs/2084005

commit 6275c7bc8dd07644ea8142a1773d826800f0f3f7 upstream.

Fix a race condition if the clock provider comes up after mmc is probed,
this causes mmc to fail without retrying.
When given the DEFER error from the clk source, pass it on up the chain.

Fixes: f90a0612f0 ("mmc: dw_mmc: lookup for optional biu and ciu clocks")
Signed-off-by: Ben Whitten <ben.whitten@gmail.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20240811212212.123255-1-ben.whitten@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Ben Whitten
2024-08-11 22:22:11 +01:00
committed by Mehmet Basaran
parent 5b0d0081c6
commit 69e650a0f3
1 changed files with 8 additions and 0 deletions
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drivers/mmc/host/dw_mmc.c
+8
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@@ -3294,6 +3294,10 @@ int dw_mci_probe(struct dw_mci *host)
host->biu_clk = devm_clk_get(host->dev, "biu");
if (IS_ERR(host->biu_clk)) {
dev_dbg(host->dev, "biu clock not available\n");
ret = PTR_ERR(host->biu_clk);
if (ret == -EPROBE_DEFER)
return ret;
} else {
ret = clk_prepare_enable(host->biu_clk);
if (ret) {
@@ -3305,6 +3309,10 @@ int dw_mci_probe(struct dw_mci *host)
host->ciu_clk = devm_clk_get(host->dev, "ciu");
if (IS_ERR(host->ciu_clk)) {
dev_dbg(host->dev, "ciu clock not available\n");
ret = PTR_ERR(host->ciu_clk);
if (ret == -EPROBE_DEFER)
goto err_clk_biu;
host->bus_hz = host->pdata->bus_hz;
} else {
ret = clk_prepare_enable(host->ciu_clk);