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mmc: sunxi: Add card busy detection
Some sdio wifi modules have not been working reliable with the sunxi-mmc host code. This turns out to be caused by starting new io-rw commands while the card signals that it is still busy processing a previous command. This commit adds card-busy detection to the sunxi-mmc driver which together with recent core changes to check card-busy before starting io-rw commands fixes the wifi reliability issues on the Cubietruck and other sunxi boards using sdio wifi. Reported-by: Eugene K <sigintmailru@gmail.com> Suggested-by: Eugene K <sigintmailru@gmail.com> Cc: Eugene K <sigintmailru@gmail.com> Cc: Arend van Spriel <arend@broadcom.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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1 changed files with 8 additions and 0 deletions
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@ -873,6 +873,13 @@ static void sunxi_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq)
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spin_unlock_irqrestore(&host->lock, iflags);
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spin_unlock_irqrestore(&host->lock, iflags);
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}
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}
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static int sunxi_mmc_card_busy(struct mmc_host *mmc)
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{
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struct sunxi_mmc_host *host = mmc_priv(mmc);
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return !!(mmc_readl(host, REG_STAS) & SDXC_CARD_DATA_BUSY);
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}
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static const struct of_device_id sunxi_mmc_of_match[] = {
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static const struct of_device_id sunxi_mmc_of_match[] = {
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{ .compatible = "allwinner,sun4i-a10-mmc", },
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{ .compatible = "allwinner,sun4i-a10-mmc", },
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{ .compatible = "allwinner,sun5i-a13-mmc", },
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{ .compatible = "allwinner,sun5i-a13-mmc", },
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@ -888,6 +895,7 @@ static struct mmc_host_ops sunxi_mmc_ops = {
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.get_cd = mmc_gpio_get_cd,
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.get_cd = mmc_gpio_get_cd,
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.enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
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.enable_sdio_irq = sunxi_mmc_enable_sdio_irq,
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.hw_reset = sunxi_mmc_hw_reset,
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.hw_reset = sunxi_mmc_hw_reset,
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.card_busy = sunxi_mmc_card_busy,
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};
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};
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static const struct sunxi_mmc_clk_delay sunxi_mmc_clk_delays[] = {
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static const struct sunxi_mmc_clk_delay sunxi_mmc_clk_delays[] = {
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