Re: [PATCH v3 6/7] mmc: sdhci_am654: Fix SDHCI_RESET_ALL for CQHCI

Adrian Hunter
2022-10-25T13:11:21Z

On 24/10/22 20:55, 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.
>
> Fixes: f545702b74f9 ("mmc: sdhci_am654: Add Support for Command Queuing Engine to J721E")
> Signed-off-by: Brian Norris <briannorris@chromium.org>
> ---
>
> Changes in v3:
> - Use new SDHCI+CQHCI helper
>
> drivers/mmc/host/sdhci_am654.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mmc/host/sdhci_am654.c b/drivers/mmc/host/sdhci_am654.c
> index 8f1023480e12..6a282c7a221e 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);

What about sdhci_reset in sdhci_am654_ops ?