linux-kernel - Re: [PATCH v3 1/3] mmc: mmci: Support any block sizes for ux500v2 and qcom variant

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Date:   Wed, 6 Mar 2019 09:03:51 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Linus Walleij <linus.walleij@...aro.org>
Cc:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        linux-mmc <linux-mmc@...r.kernel.org>,
        Chris Ball <chris@...ntf.net>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Russell King <linux@....linux.org.uk>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org
Subject: Re: [PATCH v3 1/3] mmc: mmci: Support any block sizes for ux500v2
 and qcom variant

On Tue 05 Mar 14:25 PST 2019, Linus Walleij wrote:

> Sorry for top-posting, patch included for context.
> 
> I saw today that Brian has the Nexus 5 working with Broadcom/Cypress
> 4339 over SDIO on the MMCI.
> 
> Brian are you managing to use the WLAN without this patch or is this
> something you stacked up to make it work? (If you want context I
> can forward the rest of the conversation where we discuss how to
> fix it properly.)
> 

Brian's Nexus 5 is on 8974 where the MMCI block has become the sdhci-msm
block, so while being a superset (afaict) of the old MMCI block we use
the sdhci driver instead.

> I discussed this patch several times with Ulf and I think Niklas looked
> at it too, but we never got around to fix it up properly.
> 

This is still needed for at least 8064 to have working sdio wifi (and
perhaps your 8060?).

Regards,
Bjorn

> Yours,
> Linus Walleij
> 
> 
> On Fri, Aug 22, 2014 at 6:54 AM Srinivas Kandagatla
> <srinivas.kandagatla@...aro.org> wrote:
> 
> > From: Ulf Hansson <ulf.hansson@...aro.org>
> >
> > For the ux500v2 variant of the PL18x block, any block sizes are
> > supported. This will make it possible to decrease data overhead
> > for SDIO transfers.
> >
> > This patch is based on Ulf Hansson patch
> > http://www.spinics.net/lists/linux-mmc/msg12160.html
> >
> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> >         enabled this support on qcom variant.
> >
> > Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> > Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
> > ---
> >  drivers/mmc/host/mmci.c | 10 +++++++---
> >  1 file changed, 7 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
> > index c11cb05..533ad2b 100644
> > --- a/drivers/mmc/host/mmci.c
> > +++ b/drivers/mmc/host/mmci.c
> > @@ -77,6 +77,7 @@ static unsigned int fmax = 515633;
> >   * @qcom_fifo: enables qcom specific fifo pio read logic.
> >   * @reversed_irq_handling: handle data irq before cmd irq.
> >   * @qcom_dml: enables qcom specific dma glue for dma transfers.
> > + * @any_blksize: true if block any sizes are supported
> >   */
> >  struct variant_data {
> >         unsigned int            clkreg;
> > @@ -102,6 +103,7 @@ struct variant_data {
> >         bool                    qcom_fifo;
> >         bool                    reversed_irq_handling;
> >         bool                    qcom_dml;
> > +       bool                    any_blksize;
> >  };
> >
> >  static struct variant_data variant_arm = {
> > @@ -194,6 +196,7 @@ static struct variant_data variant_ux500v2 = {
> >         .pwrreg_clkgate         = true,
> >         .busy_detect            = true,
> >         .pwrreg_nopower         = true,
> > +       .any_blksize            = true,
> >  };
> >
> >  static struct variant_data variant_qcom = {
> > @@ -212,6 +215,7 @@ static struct variant_data variant_qcom = {
> >         .explicit_mclk_control  = true,
> >         .qcom_fifo              = true,
> >         .qcom_dml               = true,
> > +       .any_blksize            = true,
> >  };
> >
> >  static int mmci_card_busy(struct mmc_host *mmc)
> > @@ -239,10 +243,11 @@ static int mmci_card_busy(struct mmc_host *mmc)
> >  static int mmci_validate_data(struct mmci_host *host,
> >                               struct mmc_data *data)
> >  {
> > +       struct variant_data *variant = host->variant;
> > +
> >         if (!data)
> >                 return 0;
> > -
> > -       if (!is_power_of_2(data->blksz)) {
> > +       if (!is_power_of_2(data->blksz) && !variant->any_blksize) {
> >                 dev_err(mmc_dev(host->mmc),
> >                         "unsupported block size (%d bytes)\n", data->blksz);
> >                 return -EINVAL;
> > @@ -796,7 +801,6 @@ static void mmci_start_data(struct mmci_host *host, struct mmc_data *data)
> >         writel(host->size, base + MMCIDATALENGTH);
> >
> >         blksz_bits = ffs(data->blksz) - 1;
> > -       BUG_ON(1 << blksz_bits != data->blksz);
> >
> >         if (variant->blksz_datactrl16)
> >                 datactrl = MCI_DPSM_ENABLE | (data->blksz << 16);
> > --
> > 1.9.1
> >