On 20/10/22 01:19, Brian Norris wrote:
On Wed, Oct 19, 2022 at 02:59:39PM -0700, Florian Fainelli wrote:
On 10/19/22 14:54, Brian Norris wrote:
The same bug was already found and fixed for two other drivers, in v5.7 and v5.9:
5cf583f1fb9c mmc: sdhci-msm: Deactivate CQE during SDHC reset df57d73276b8 mmc: sdhci-pci: Fix SDHCI_RESET_ALL for CQHCI for Intel GLK-based controllers
The latter is especially prescient, saying "other drivers using CQHCI might benefit from a similar change, if they also have CQHCI reset by SDHCI_RESET_ALL."
--- a/drivers/mmc/host/sdhci-of-arasan.c +++ b/drivers/mmc/host/sdhci-of-arasan.c @@ -366,6 +366,9 @@ static void sdhci_arasan_reset(struct sdhci_host *host, u8 mask) struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_arasan_data *sdhci_arasan = sdhci_pltfm_priv(pltfm_host);
- if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL))
cqhci_deactivate(host->mmc);- sdhci_reset(host, mask);
Cannot this be absorbed by sdhci_reset() that all of these drivers appear to be utilizing since you have access to the host and the mask to make that decision?
It potentially could.
I don't know if this is a specified SDHCI behavior that really belongs in the common helper, or if this is just a commonly-shared behavior. Per the comments I quote above ("if they also have CQHCI reset by SDHCI_RESET_ALL"), I chose to leave that as an implementation-specific behavior.
I suppose it's not all that harmful to do this even if some SDHCI controller doesn't have the same behavior/quirk.
I guess I also don't know if any SDHCI controllers will support command queueing (MMC_CAP2_CQE) via somethings *besides* CQHCI. I see CQE support in sdhci-sprd.c without CQHCI, although that driver doesn't set MMC_CAP2_CQE.
SDHCI and CQHCI are separate modules and are not dependent, so they cannot call into each other directly (and should not). A new CQE API would be needed in mmc_cqe_ops e.g. (*cqe_notify_reset)(struct mmc_host *host), and wrapped in mmc/host.h:
static inline void mmc_cqe_notify_reset(struct mmc_host *host) { if (host->cqe_ops->cqe_notify_reset) host->cqe_ops->cqe_notify_reset(host); }
Alternatively, you could make a new module for SDHCI/CQHCI helper functions, although in this case there is so little code it could be static inline and added in a new include file instead, say sdhci-cqhci.h e.g.
#include "cqhci.h" #include "sdhci.h"
static inline void sdhci_cqhci_reset(struct sdhci_host *host, u8 mask) { if ((host->mmc->caps2 & MMC_CAP2_CQE) && (mask & SDHCI_RESET_ALL) && host->mmc->cqe_private) cqhci_deactivate(host->mmc); sdhci_reset(host, mask); }