Re: [PATCH v3] edac: synopsys: Fix the issue in reporting of the error count

[Michal Simek <michal.simek@xilinx.com>]

On 4/14/22 12:28, Shubhrajyoti Datta wrote:
> Currently the error count from status register is being read which
> is not correct. Fix the issue by reading the count from the
> error count register(ERRCNT).
> 
> Fixes: b500b4a029d5 ("EDAC, synopsys: Add ECC support for ZynqMP DDR controller")
> Cc: <stable@vger.kernel.org>
> Signed-off-by: Shubhrajyoti Datta <shubhrajyoti.datta@xilinx.com>
> ---
> v2:
> Remove the cumulative count change
> v3:
> Add the fixes and stable tag
> 
>   drivers/edac/synopsys_edac.c | 15 +++++++++++----
>   1 file changed, 11 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/edac/synopsys_edac.c b/drivers/edac/synopsys_edac.c
> index f05ff02c0656..1a9a5b886903 100644
> --- a/drivers/edac/synopsys_edac.c
> +++ b/drivers/edac/synopsys_edac.c
> @@ -164,6 +164,11 @@
>   #define ECC_STAT_CECNT_SHIFT		8
>   #define ECC_STAT_BITNUM_MASK		0x7F
>   
> +/* ECC error count register definitions */
> +#define ECC_ERRCNT_UECNT_MASK		0xFFFF0000
> +#define ECC_ERRCNT_UECNT_SHIFT		16
> +#define ECC_ERRCNT_CECNT_MASK		0xFFFF
> +
>   /* DDR QOS Interrupt register definitions */
>   #define DDR_QOS_IRQ_STAT_OFST		0x20200
>   #define DDR_QOSUE_MASK			0x4
> @@ -423,14 +428,16 @@ static int zynqmp_get_error_info(struct synps_edac_priv *priv)
>   	base = priv->baseaddr;
>   	p = &priv->stat;
>   
> +	regval = readl(base + ECC_ERRCNT_OFST);
> +	p->ce_cnt = regval & ECC_ERRCNT_CECNT_MASK;
> +	p->ue_cnt = (regval & ECC_ERRCNT_UECNT_MASK) >> ECC_ERRCNT_UECNT_SHIFT;
> +	if (!p->ce_cnt)
> +		goto ue_err;
> +
>   	regval = readl(base + ECC_STAT_OFST);
>   	if (!regval)
>   		return 1;
>   
> -	p->ce_cnt = (regval & ECC_STAT_CECNT_MASK) >> ECC_STAT_CECNT_SHIFT;
> -	p->ue_cnt = (regval & ECC_STAT_UECNT_MASK) >> ECC_STAT_UECNT_SHIFT;
> -	if (!p->ce_cnt)
> -		goto ue_err;
>   
>   	p->ceinfo.bitpos = (regval & ECC_STAT_BITNUM_MASK);
>   

Acked-by: Michal Simek <michal.simek@xilinx.com>

M