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SubjectRe: [PATCH v4 2/2] mmc: sdhci-omap: Don't finish_mrq() on a command error during tuning
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On 26/03/19 1:00 PM, Faiz Abbas wrote:
> commit 5b0d62108b46 ("mmc: sdhci-omap: Add platform specific reset
> callback") skips data resets during tuning operation. Because of this,
> a data error or data finish interrupt might still arrive after a command
> error has been handled and the mrq ended. This ends up with a "mmc0: Got
> data interrupt 0x00000002 even though no data operation was in progress"
> error message.
>
> Fix this by adding a platform specific callback for sdhci_irq. Mark the
> mrq as a failure but wait for a data interrupt instead of calling
> finish_mrq().
>
> Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
> ---
> drivers/mmc/host/sdhci-omap.c | 37 +++++++++++++++++++++++++++++++++++
> 1 file changed, 37 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 5bbed477c9b1..9da2ff9ede8b 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -797,6 +797,42 @@ void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
> sdhci_reset(host, mask);
> }
>
> +#define CMD_ERR_MASK (SDHCI_INT_CRC | SDHCI_INT_END_BIT | SDHCI_INT_INDEX |\
> + SDHCI_INT_TIMEOUT)
> +#define CMD_MASK (CMD_ERR_MASK | SDHCI_INT_RESPONSE)
> +
> +static irqreturn_t sdhci_omap_irq(struct sdhci_host *host, u32 intmask)
> +{
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
> +
> + if (omap_host->is_tuning && (intmask & CMD_ERR_MASK)) {
> +
> + /*
> + * Since we are not resetting data lines during tuning
> + * operation, data error or data complete interrupts
> + * might still arrive. Mark this request as a failure
> + * but still wait for the data interrupt
> + */
> + if (intmask & SDHCI_INT_TIMEOUT)
> + host->cmd->error = -ETIMEDOUT;
> + else
> + host->cmd->error = -EILSEQ;
> +
> + sdhci_finish_command(host);

Would it be possible to set SDHCI_INT_RESPONSE instead of calling
sdhci_finish_command() directly?

> +
> + /*
> + * Sometimes command error interrupts and command complete
> + * interrupt will arrive together. Clear all command related
> + * interrupts here.
> + */
> + sdhci_writel(host, intmask & CMD_MASK, SDHCI_INT_STATUS);
> + intmask &= ~CMD_MASK;
> + }
> +
> + return intmask;
> +}
> +
> static struct sdhci_ops sdhci_omap_ops = {
> .set_clock = sdhci_omap_set_clock,
> .set_power = sdhci_omap_set_power,
> @@ -807,6 +843,7 @@ static struct sdhci_ops sdhci_omap_ops = {
> .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
> .reset = sdhci_omap_reset,
> .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
> + .irq = sdhci_omap_irq,
> };
>
> static int sdhci_omap_set_capabilities(struct sdhci_omap_host *omap_host)
>

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