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To:     Christoph Muellner <christoph.muellner@theobroma-systems.com>,
        robh+dt@kernel.org, mark.rutland@arm.com, heiko@sntech.de,
        ulf.hansson@linaro.org, adrian.hunter@intel.com
References: <20190301164349.60589-1-christoph.muellner@theobroma-systems.com>
 <20190301164349.60589-3-christoph.muellner@theobroma-systems.com>
From:   Shawn Lin <shawn.lin@rock-chips.com>
Message-ID: <185f44f1-c41d-cb67-d5c2-5878c05516ba@rock-chips.com>
Date:   Sat, 2 Mar 2019 08:47:45 +0800
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On 2019/3/2 0:43, Christoph Muellner wrote:
> When using direct commands (DCMDs) on an RK3399, we get spurious
> CQE completion interrupts for the DCMD transaction slot (#31):

I didn't see it. Do you try any newer code, for instance, linux-next?

> 
> [  931.196520] ------------[ cut here ]------------
> [  931.201702] mmc1: cqhci: spurious TCN for tag 31
> [  931.206906] WARNING: CPU: 0 PID: 1433 at
> /usr/src/kernel/drivers/mmc/host/cqhci.c:725 cqhci_irq+0x2e4/0x490
> [  931.206909] Modules linked in:
> [  931.206918] CPU: 0 PID: 1433 Comm: irq/29-mmc1 Not tainted
> 4.19.8-rt6-funkadelic #1
> [  931.206920] Hardware name: Theobroma Systems RK3399-Q7 SoM (DT)
> [  931.206924] pstate: 40000005 (nZcv daif -PAN -UAO)
> [  931.206927] pc : cqhci_irq+0x2e4/0x490
> [  931.206931] lr : cqhci_irq+0x2e4/0x490
> [  931.206933] sp : ffff00000e54bc80
> [  931.206934] x29: ffff00000e54bc80 x28: 0000000000000000
> [  931.206939] x27: 0000000000000001 x26: ffff000008f217e8
> [  931.206944] x25: ffff8000f02ef030 x24: ffff0000091417b0
> [  931.206948] x23: ffff0000090aa000 x22: ffff8000f008b000
> [  931.206953] x21: 0000000000000002 x20: 000000000000001f
> [  931.206957] x19: ffff8000f02ef018 x18: ffffffffffffffff
> [  931.206961] x17: 0000000000000000 x16: 0000000000000000
> [  931.206966] x15: ffff0000090aa6c8 x14: 0720072007200720
> [  931.206970] x13: 0720072007200720 x12: 0720072007200720
> [  931.206975] x11: 0720072007200720 x10: 0720072007200720
> [  931.206980] x9 : 0720072007200720 x8 : 0720072007200720
> [  931.206984] x7 : 0720073107330720 x6 : 00000000000005a0
> [  931.206988] x5 : ffff00000860d4b0 x4 : 0000000000000000
> [  931.206993] x3 : 0000000000000001 x2 : 0000000000000001
> [  931.206997] x1 : 1bde3a91b0d4d900 x0 : 0000000000000000
> [  931.207001] Call trace:
> [  931.207005]  cqhci_irq+0x2e4/0x490
> [  931.207009]  sdhci_arasan_cqhci_irq+0x5c/0x90
> [  931.207013]  sdhci_irq+0x98/0x930
> [  931.207019]  irq_forced_thread_fn+0x2c/0xa0
> [  931.207023]  irq_thread+0x114/0x1c0
> [  931.207027]  kthread+0x128/0x130
> [  931.207032]  ret_from_fork+0x10/0x20
> [  931.207035] ---[ end trace 0000000000000002 ]---
> 
> The driver shows this message only for the first spurious interrupt
> by using WARN_ONCE(). Changing this to WARN() shows, that this is
> happening quite frequently (up to once a second).
> 
> Since the eMMC 5.1 specification, where CQE and CQHCI are specified,
> does not mention that spurious TCN interrupts for DCMDs can be simply
> ignored, we must assume that using this feature is not working reliably.
> 
> The current implementation uses DCMD for REQ_OP_FLUSH only, and
> I could not see any performance/power impact when disabling
> this optional feature for RK3399.
> 
> Therefore this patch disables DCMDs for RK3399.

We need to sort out the problem, and see if it could be solved, or
we just simply remove MMC_CAP2_CQE_DCMD it from sdhci-of-arasan

> 
> Signed-off-by: Christoph Muellner <christoph.muellner@theobroma-systems.com>
> Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
> ---
>   arch/arm64/boot/dts/rockchip/rk3399.dtsi | 1 +
>   1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> index 6cc1c9fa4ea6..1bbf0da4e01d 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
> @@ -333,6 +333,7 @@
>   		phys = <&emmc_phy>;
>   		phy-names = "phy_arasan";
>   		power-domains = <&power RK3399_PD_EMMC>;
> +		disable-cqe-dcmd;
>   		status = "disabled";
>   	};
>   
>