On Wed, Apr 15, 2020 at 11:52:12AM +0800, Yangbo Lu wrote: > commit 2aa3d826adb578b26629a79b775a552cfe3fedf7 upstream. > > This patch is to fix operating in esdhc_reset() for different > controller versions, and to add bus-width restoring after data > reset for eSDHC (verdor version <= 2.2). > > Also add annotation for understanding. > > Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxx> > Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx> > Link: https://lore.kernel.org/r/20200108040713.38888-1-yangbo.lu@xxxxxxx > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> > --- > drivers/mmc/host/sdhci-of-esdhc.c | 43 +++++++++++++++++++++++++++++++++++---- > 1 file changed, 39 insertions(+), 4 deletions(-) > > diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c > index fcfb50f..fd1251e 100644 > --- a/drivers/mmc/host/sdhci-of-esdhc.c > +++ b/drivers/mmc/host/sdhci-of-esdhc.c > @@ -734,23 +734,58 @@ static void esdhc_reset(struct sdhci_host *host, u8 mask) > { > struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); > struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host); > - u32 val; > + u32 val, bus_width = 0; > > + /* > + * Add delay to make sure all the DMA transfers are finished > + * for quirk. > + */ > if (esdhc->quirk_delay_before_data_reset && > (mask & SDHCI_RESET_DATA) && > (host->flags & SDHCI_REQ_USE_DMA)) > mdelay(5); > > + /* > + * Save bus-width for eSDHC whose vendor version is 2.2 > + * or lower for data reset. > + */ > + if ((mask & SDHCI_RESET_DATA) && > + (esdhc->vendor_ver <= VENDOR_V_22)) { > + val = sdhci_readl(host, ESDHC_PROCTL); > + bus_width = val & ESDHC_CTRL_BUSWIDTH_MASK; > + } > + > sdhci_reset(host, mask); > > - sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); > - sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); > + /* > + * Restore bus-width setting and interrupt registers for eSDHC > + * whose vendor version is 2.2 or lower for data reset. > + */ > + if ((mask & SDHCI_RESET_DATA) && > + (esdhc->vendor_ver <= VENDOR_V_22)) { > + val = sdhci_readl(host, ESDHC_PROCTL); > + val &= ~ESDHC_CTRL_BUSWIDTH_MASK; > + val |= bus_width; > + sdhci_writel(host, val, ESDHC_PROCTL); > + > + sdhci_writel(host, host->ier, SDHCI_INT_ENABLE); > + sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE); > + } > > - if (mask & SDHCI_RESET_ALL) { > + /* > + * Some bits have to be cleaned manually for eSDHC whose spec > + * version is higher than 3.0 for all reset. > + */ > + if ((mask & SDHCI_RESET_ALL) && > + (esdhc->spec_ver >= SDHCI_SPEC_300)) { > val = sdhci_readl(host, ESDHC_TBCTL); > val &= ~ESDHC_TB_EN; > sdhci_writel(host, val, ESDHC_TBCTL); > > + /* > + * Initialize eSDHC_DLLCFG1[DLL_PD_PULSE_STRETCH_SEL] to > + * 0 for quirk. > + */ > if (esdhc->quirk_unreliable_pulse_detection) { > val = sdhci_readl(host, ESDHC_DLLCFG1); > val &= ~ESDHC_DLL_PD_PULSE_STRETCH_SEL; > -- > 2.7.4 > Now applied to 5.5.y and 5.4.y, thanks. greg k-h
