linux-kernel - Re: [PATCH v4 6/7] mmc: sdhci_am654: Fix SDHCI_RESET

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Date:   Thu, 27 Oct 2022 10:58:43 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Brian Norris <briannorris@...omium.org>,
        Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Shawn Guo <shawnguo@...nel.org>, linux-mmc@...r.kernel.org,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Michal Simek <michal.simek@...inx.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Bjorn Andersson <andersson@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        linux-arm-msm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        Broadcom internal kernel review list 
        <bcm-kernel-feedback-list@...adcom.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Andy Gross <agross@...nel.org>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        linux-kernel@...r.kernel.org,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Al Cooper <alcooperx@...il.com>,
        Fabio Estevam <festevam@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Haibo Chen <haibo.chen@....com>,
        Sowjanya Komatineni <skomatineni@...dia.com>
Subject: Re: [PATCH v4 6/7] mmc: sdhci_am654: Fix SDHCI_RESET_ALL for CQHCI

On 26/10/22 22:42, Brian Norris wrote:
>  [[ NOTE: this is completely untested by the author, but included solely
>     because, as noted in commit df57d73276b8 ("mmc: sdhci-pci: Fix
>     SDHCI_RESET_ALL for CQHCI for Intel GLK-based controllers"), "other
>     drivers using CQHCI might benefit from a similar change, if they
>     also have CQHCI reset by SDHCI_RESET_ALL." We've now seen the same
>     bug on at least MSM, Arasan, and Intel hardware. ]]
> 
> SDHCI_RESET_ALL resets will reset the hardware CQE state, but we aren't
> tracking that properly in software. When out of sync, we may trigger
> various timeouts.
> 
> It's not typical to perform resets while CQE is enabled, but this may
> occur in some suspend or error recovery scenarios.
> 
> Include this fix by way of the new sdhci_and_cqhci_reset() helper.
> 
> This patch depends on (and should not compile without) the patch
> entitled "mmc: cqhci: Provide helper for resetting both SDHCI and
> CQHCI".
> 
> Fixes: f545702b74f9 ("mmc: sdhci_am654: Add Support for Command Queuing Engine to J721E")
> Signed-off-by: Brian Norris <briannorris@...omium.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> 
> Changes in v4:
>  - Also fix sdhci_am654_ops, sdhci_j721e_8bit_ops
>  - Add dependency notes
>  - Drop bouncing Faiz Abbas <faiz_abbas@...com> address
> 
> Changes in v3:
>  - Use new SDHCI+CQHCI helper
> 
>  drivers/mmc/host/sdhci_am654.c | 7 ++++---
>  1 file changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
> index 8f1023480e12..c2333c7acac9 100644
> --- a/drivers/mmc/host/sdhci_am654.c
> +++ b/drivers/mmc/host/sdhci_am654.c
> @@ -15,6 +15,7 @@
>  #include <linux/sys_soc.h>
>  
>  #include "cqhci.h"
> +#include "sdhci-cqhci.h"
>  #include "sdhci-pltfm.h"
>  
>  /* CTL_CFG Registers */
> @@ -378,7 +379,7 @@ static void sdhci_am654_reset(struct sdhci_host *host, u8 mask)
>  	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
>  	struct sdhci_am654_data *sdhci_am654 = sdhci_pltfm_priv(pltfm_host);
>  
> -	sdhci_reset(host, mask);
> +	sdhci_and_cqhci_reset(host, mask);
>  
>  	if (sdhci_am654->quirks & SDHCI_AM654_QUIRK_FORCE_CDTEST) {
>  		ctrl = sdhci_readb(host, SDHCI_HOST_CONTROL);
> @@ -464,7 +465,7 @@ static struct sdhci_ops sdhci_am654_ops = {
>  	.set_clock = sdhci_am654_set_clock,
>  	.write_b = sdhci_am654_write_b,
>  	.irq = sdhci_am654_cqhci_irq,
> -	.reset = sdhci_reset,
> +	.reset = sdhci_and_cqhci_reset,
>  };
>  
>  static const struct sdhci_pltfm_data sdhci_am654_pdata = {
> @@ -494,7 +495,7 @@ static struct sdhci_ops sdhci_j721e_8bit_ops = {
>  	.set_clock = sdhci_am654_set_clock,
>  	.write_b = sdhci_am654_write_b,
>  	.irq = sdhci_am654_cqhci_irq,
> -	.reset = sdhci_reset,
> +	.reset = sdhci_and_cqhci_reset,
>  };
>  
>  static const struct sdhci_pltfm_data sdhci_j721e_8bit_pdata = {