[PATCH] mmc: meson-gx: fix irq ack

[PATCH] mmc: meson-gx: fix irq ack

[Jerome Brunet]

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@baylibre.com>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 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

Re: [PATCH] mmc: meson-gx: fix irq ack

[Kevin Hilman]

Jerome Brunet <jbrunet@baylibre.com> writes:

> 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@baylibre.com>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

Reviewed-by: Kevin Hilman <khilman@baylibre.com>

And to be clear, this fix should go into v5.2-rc.

My Tested-by is already above, but just for the benefit of the
archives... tested this on mainline, and also on a v4.19 backport with
Android and it fixes issues see there.

Kevin

Re: [PATCH] mmc: meson-gx: fix irq ack

[Brad Harper]

On 24/05/2019 12:59 am, Jerome Brunet 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@baylibre.com>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
> ---
>   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;
>   }
>   
> 
This patch resolves issues I was having with hung tasks waiting for emmc 
& sd cards on the odroid N2.

Tested-by: Brad Harper <bjharper@gmail.com>

Re: [PATCH] mmc: meson-gx: fix irq ack

[Ulf Hansson]

On Thu, 23 May 2019 at 16:59, Jerome Brunet <jbrunet@baylibre.com> 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@baylibre.com>
> Tested-by: Kevin Hilman <khilman@baylibre.com>
> Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>

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
>