mmc: core: Do regular power cycle when lacking eMMC HW reset support
The eMMC HW reset may be implemented either via the host ops ->hw_reset() callback or through DT and the eMMC pwrseq. Additionally some eMMC cards don't support HW reset. To allow a reset to be done for the different combinations of mmc hosts and eMMC/MMC cards, let's implement a fallback via trying a regular power cycle. This improves the mmc block layer retry mechanism of failing I/O requests. Signed-off-by: Gwendal Grignou <gwendal@chromium.org> [Ulf: Rewrote changelog] Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -2456,8 +2456,9 @@ int mmc_hw_reset(struct mmc_host *host)
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ret = host->bus_ops->reset(host);
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mmc_bus_put(host);
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if (ret != -EOPNOTSUPP)
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pr_warn("%s: tried to reset card\n", mmc_hostname(host));
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if (ret)
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pr_warn("%s: tried to reset card, got error %d\n",
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mmc_hostname(host), ret);
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return ret;
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}
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@ -1957,19 +1957,17 @@ static int mmc_reset(struct mmc_host *host)
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{
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struct mmc_card *card = host->card;
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if (!(host->caps & MMC_CAP_HW_RESET) || !host->ops->hw_reset)
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return -EOPNOTSUPP;
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if (!mmc_can_reset(card))
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return -EOPNOTSUPP;
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if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset &&
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mmc_can_reset(card)) {
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/* If the card accept RST_n signal, send it. */
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mmc_set_clock(host, host->f_init);
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host->ops->hw_reset(host);
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/* Set initial state and call mmc_set_ios */
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mmc_set_initial_state(host);
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} else {
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/* Do a brute force power cycle */
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mmc_power_cycle(host, card->ocr);
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}
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return mmc_init_card(host, card->ocr, card);
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}
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