On Thu, 23 May 2019 at 16:59, Jerome Brunet <jbrunet@xxxxxxxxxxxx> wrote:
>
> While cleaning the ISR of the meson-gx and acking only raised irqs,
> the ack of the irq was moved at the very last stage of the function.
>
> This was stable during the initial tests but it triggered issues with
> hs200, under specific loads (like booting android). Acking the irqs
> after calling the mmc_request_done() causes the problem.
>
> Moving the ack back to the original place solves the issue. Since the
> irq is edge triggered, it does not hurt to ack irq even earlier, so
> let's do it early in the ISR.
>
> Fixes: 9c5fdb07a28d ("mmc: meson-gx: ack only raised irq")
> Tested-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
> Tested-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
> Signed-off-by: Jerome Brunet <jbrunet@xxxxxxxxxxxx>
Applied for fixes, thanks!
Kind regards
Uffe
> ---
> drivers/mmc/host/meson-gx-mmc.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 6ef465304052..cb3f6811d69a 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -873,6 +873,9 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
> if (WARN_ON(!host) || WARN_ON(!host->cmd))
> return IRQ_NONE;
>
> + /* ack all raised interrupts */
> + writel(status, host->regs + SD_EMMC_STATUS);
> +
> cmd = host->cmd;
> data = cmd->data;
> cmd->error = 0;
> @@ -919,9 +922,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)
> if (ret == IRQ_HANDLED)
> meson_mmc_request_done(host->mmc, cmd->mrq);
>
> - /* ack all raised interrupts */
> - writel(status, host->regs + SD_EMMC_STATUS);
> -
> return ret;
> }
>
> --
> 2.20.1
>
