On Tue, 26 Oct 2021 at 09:08, Wenbin Mei <wenbin.mei@xxxxxxxxxxxx> wrote:
>
> While mmc0 enter suspend state, we need halt CQE to send legacy cmd(flush
> cache) and disable cqe, for resume back, we enable CQE and not clear HALT
> state.
> In this case MediaTek mmc host controller will keep the value for HALT
> state after CQE disable/enable flow, so the next CQE transfer after resume
> will be timeout due to CQE is in HALT state, the log as below:
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: timeout for tag 2
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: ============ CQHCI REGISTER DUMP ===========
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Caps: 0x100020b6 | Version: 0x00000510
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Config: 0x00001103 | Control: 0x00000001
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Int stat: 0x00000000 | Int enab: 0x00000006
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Int sig: 0x00000006 | Int Coal: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: TDL base: 0xfd05f000 | TDL up32: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Doorbell: 0x8000203c | TCN: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Task clr: 0x00000000 | SSC1: 0x00001000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: SSC2: 0x00000001 | DCMD rsp: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: RED mask: 0xfdf9a080 | TERRI: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: Resp idx: 0x00000000 | Resp arg: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: CRNQP: 0x00000000 | CRNQDUN: 0x00000000
> <4>.(4)[318:kworker/4:1H]mmc0: cqhci: CRNQIS: 0x00000000 | CRNQIE: 0x00000000
>
> This change check HALT state after CQE enable, if CQE is in HALT state, we
> will clear it.
>
> Signed-off-by: Wenbin Mei <wenbin.mei@xxxxxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
Applied for fixes and by adding a fixes tag, thanks!
Fixes: a4080225f51d ("mmc: cqhci: support for command queue enabled host")
Kind regards
Uffe
> ---
> drivers/mmc/host/cqhci-core.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
> index ca8329d55f43..b0d30c35c390 100644
> --- a/drivers/mmc/host/cqhci-core.c
> +++ b/drivers/mmc/host/cqhci-core.c
> @@ -282,6 +282,9 @@ static void __cqhci_enable(struct cqhci_host *cq_host)
>
> cqhci_writel(cq_host, cqcfg, CQHCI_CFG);
>
> + if (cqhci_readl(cq_host, CQHCI_CTL) & CQHCI_HALT)
> + cqhci_writel(cq_host, 0, CQHCI_CTL);
> +
> mmc->cqe_on = true;
>
> if (cq_host->ops->enable)
> --
> 2.25.1
>
