linux-kernel - Re: [PATCH 6/6] mmc: sdhci-brcmstb: Add BCM2712 SD Express support

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Date: Sat, 27 Apr 2024 13:16:36 +0200
From: Andrea della Porta <andrea.porta@...e.com>
To: Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc: Andrea della Porta <andrea.porta@...e.com>, adrian.hunter@...el.com,
	alcooperx@...il.com, bcm-kernel-feedback-list@...adcom.com,
	conor+dt@...nel.org, devicetree@...r.kernel.org,
	florian.fainelli@...adcom.com, jonathan@...pberrypi.com,
	kamal.dasu@...adcom.com, krzysztof.kozlowski+dt@...aro.org,
	linus.walleij@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-gpio@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-mmc@...r.kernel.org, phil@...pberrypi.com, robh@...nel.org,
	ulf.hansson@...aro.org
Subject: Re: [PATCH 6/6] mmc: sdhci-brcmstb: Add BCM2712 SD Express support

On 09:34 Sun 14 Apr     , Christophe JAILLET wrote:
> Le 14/04/2024 à 00:14, Andrea della Porta a écrit :
> > Broadcom BCM2712 SDHCI controller is SD Express capable. Add support
> > for sde capability where the implementation is based on downstream driver,
> > diverging from it in the way that init_sd_express callback is invoked:
> > in downstream the sdhci_ops structure has been augmented with a new
> > function ptr 'init_sd_express' that just propagate the call to the
> > driver specific callback so that the callstack from a structure
> > standpoint is mmc_host_ops -> sdhci_ops. The drawback here is in the
> > added level of indirection (the newly added init_sd_express is
> > redundant) and the sdhci_ops structure declaration has to be changed.
> > To overcome this the presented approach consist in patching the mmc_host_ops
> > init_sd_express callback to point directly to the custom function defined in
> > this driver (see struct brcmstb_match_priv).
> > 
> > Signed-off-by: Andrea della Porta <andrea.porta-IBi9RG/b67k@...lic.gmane.org>
> > ---
> >   drivers/mmc/host/Kconfig         |   1 +
> >   drivers/mmc/host/sdhci-brcmstb.c | 147 ++++++++++++++++++++++++++++++-
> >   2 files changed, 147 insertions(+), 1 deletion(-)
> 
> ...
> 
> > +	if (brcmstb_priv->sde_pcie) {
> > +		struct of_changeset changeset;
> > +		static struct property okay_property = {
> > +			.name = "status",
> > +			.value = "okay",
> > +			.length = 5,
> > +		};
> > +
> > +		/* Enable the pcie controller */
> > +		of_changeset_init(&changeset);
> > +		ret = of_changeset_update_property(&changeset,
> > +						   brcmstb_priv->sde_pcie,
> > +						   &okay_property);
> > +		if (ret) {
> > +			dev_err(dev, "%s: failed to update property - %d\n", __func__,
> > +			       ret);
> > +			return -ENODEV;
> > +		}
> > +		ret = of_changeset_apply(&changeset);
> > +	}
> > +
> > +	dev_dbg(dev, "%s -> %d\n", __func__, ret);
> 
> Is this really useful?

Not really. Removed.

> 
> > +	return ret;
> > +}
> > +
> 
> ...
> 
> > @@ -468,6 +581,24 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
> >   	if (res)
> >   		goto err;
> > +	priv->sde_1v8 = devm_regulator_get_optional(&pdev->dev, "sde-1v8");
> > +	if (IS_ERR(priv->sde_1v8))
> > +		priv->flags &= ~BRCMSTB_PRIV_FLAGS_HAS_SD_EXPRESS;
> > +
> > +	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 2);
> > +	if (iomem) {
> > +		priv->sde_ioaddr = devm_ioremap_resource(&pdev->dev, iomem);
> > +		if (IS_ERR(priv->sde_ioaddr))
> > +			priv->sde_ioaddr = NULL;
> > +	}
> > +
> > +	iomem = platform_get_resource(pdev, IORESOURCE_MEM, 3);
> > +	if (iomem) {
> > +		priv->sde_ioaddr2 = devm_ioremap_resource(&pdev->dev, iomem);
> > +		if (IS_ERR(priv->sde_ioaddr2))
> > +			priv->sde_ioaddr = NULL;
> 
> sde_ioaddr2 ?
> 
> > +	}
> > +
> >   	priv->pinctrl = devm_pinctrl_get(&pdev->dev);
> >   	if (IS_ERR(priv->pinctrl)) {
> >   			no_pinctrl = true;
> > @@ -478,8 +609,16 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
> >   			no_pinctrl = true;
> >   	}
> > -	if (no_pinctrl )
> > +	priv->pins_sdex = pinctrl_lookup_state(priv->pinctrl, "sd-express");
> > +	if (IS_ERR(priv->pins_sdex)) {
> > +			dev_dbg(&pdev->dev, "No pinctrl sd-express state\n");
> > +			no_pinctrl = true;
> 
> Indentation looks too large.

Ack.

> 
> > +	}
> > +
> > +	if (no_pinctrl || !priv->sde_ioaddr || !priv->sde_ioaddr2) {
> >   		priv->pinctrl = NULL;
> > +		priv->flags &= ~BRCMSTB_PRIV_FLAGS_HAS_SD_EXPRESS;
> > +	}
> >   	/*
> >   	 * Automatic clock gating does not work for SD cards that may
> 
> ...
> 

In general I'll drop SD express patch for now, it will be re-introduced in a future patch.

Best regards,
Andrea