[PATCH v2] mmc: sdhci-of-arasan: Add quirk to avoid unexpected interrupt msgs

[Adrian Hunter]

On 13/03/18 16:26, Phil Edworthy wrote:
> On SD 2.00 cards we get lots of these messages:
> "mmc0: Got data interrupt 0x00000002 even though no data operation was in progress"
> By applying the SDHCI_QUIRK2_STOP_WITH_TC quirk, the messages no longer happen.
> 
> A single card claiming to be SD 3.00 compliant also generates the interrupts,
> but since the card's manfacturing date is 2002 mar, it's unlikely to really be
> SD 3.00. This card is a 8GB SanDisk 'SU08G' 8.0 (SDHC class 4).
> 
> This has been reported on Xilinx devices that also use the Arasan IP.
> See https://patchwork.kernel.org/patch/8062871/
> 
> This has been tested on the Renesas RZ/ND-DB board with the RZ/N1 SoC. The
> Arasan IP in this device is version 1.39a and uses a max SD clock of 50MHz and
> does not support DDR modes.
> 
> Signed-off-by: Phil Edworthy <phil.edworthy at renesas.com>

Acked-by: Adrian Hunter <adrian.hunter at intel.com>

> ---
> v2:
>  - Changed commit msg to detail the cards that fail.
>  - Provided the IP version and further background info.
> ---
>  drivers/mmc/host/sdhci-of-arasan.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mmc/host/sdhci-of-arasan.c b/drivers/mmc/host/sdhci-of-arasan.c
> index c33a5f7..ab66e32 100644
> --- a/drivers/mmc/host/sdhci-of-arasan.c
> +++ b/drivers/mmc/host/sdhci-of-arasan.c
> @@ -290,7 +290,8 @@ static const struct sdhci_pltfm_data sdhci_arasan_pdata = {
>  	.ops = &sdhci_arasan_ops,
>  	.quirks = SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
>  	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
> -			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN,
> +			SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN |
> +			SDHCI_QUIRK2_STOP_WITH_TC,
>  };
>  
>  static u32 sdhci_arasan_cqhci_irq(struct sdhci_host *host, u32 intmask)
>