linux-kernel - RE: [PATCH 3/5] scsi: ufs: tc-dwc-pci: Use PDI ID to match Test Chip type

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Date:   Fri, 24 Apr 2020 12:08:11 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     "Winkler, Tomas" <tomas.winkler@...el.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
CC:     Joao Pinto <Joao.Pinto@...opsys.com>,
        Joao Lima <Joao.Lima@...opsys.com>,
        "Alim Akhtar" <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH 3/5] scsi: ufs: tc-dwc-pci: Use PDI ID to match Test Chip
 type

From: Winkler, Tomas <tomas.winkler@...el.com>
Date: Apr/24/2020, 13:00:33 (UTC+00:00)

> > 
> > In preparation for the addition of new Test Chips, we re-arrange the
> > initialization sequence so that we rely on PCI ID to match for given Test Chip
> > type.
> > 
> > Signed-off-by: Jose Abreu <Jose.Abreu@...opsys.com>
> > 
> > ---
> > Cc: Joao Lima <Joao.Lima@...opsys.com>
> > Cc: Jose Abreu <Jose.Abreu@...opsys.com>
> > Cc: Alim Akhtar <alim.akhtar@...sung.com>
> > Cc: Avri Altman <avri.altman@....com>
> > Cc: "James E.J. Bottomley" <jejb@...ux.ibm.com>
> > Cc: "Martin K. Petersen" <martin.petersen@...cle.com>
> > Cc: linux-scsi@...r.kernel.org
> > Cc: linux-kernel@...r.kernel.org
> > ---
> >  drivers/scsi/ufs/tc-dwc-pci.c | 68 ++++++++++++++++++++++++++++-----------
> > ----
> >  1 file changed, 44 insertions(+), 24 deletions(-)
> > 
> > diff --git a/drivers/scsi/ufs/tc-dwc-pci.c b/drivers/scsi/ufs/tc-dwc-pci.c index
> > aeb11f7f0c91..74a2d80d32bd 100644
> > --- a/drivers/scsi/ufs/tc-dwc-pci.c
> > +++ b/drivers/scsi/ufs/tc-dwc-pci.c
> > @@ -14,6 +14,11 @@
> >  #include <linux/pci.h>
> >  #include <linux/pm_runtime.h>
> > 
> > +struct tc_dwc_data {
> > +	struct ufs_hba_variant_ops ops;
> > +	int (*setup)(struct pci_dev *pdev, struct tc_dwc_data *data); };
> > +
> >  /* Test Chip type expected values */
> >  #define TC_G210_20BIT 20
> >  #define TC_G210_40BIT 40
> > @@ -23,6 +28,20 @@ static int tc_type = TC_G210_INV;
> > module_param(tc_type, int, 0);  MODULE_PARM_DESC(tc_type, "Test Chip
> > Type (20 = 20-bit, 40 = 40-bit)");
> > 
> > +static int tc_dwc_g210_set_config(struct pci_dev *pdev, struct
> > +tc_dwc_data *data) {
> > +	if (tc_type == TC_G210_20BIT) {
> > +		data->ops.phy_initialization = tc_dwc_g210_config_20_bit;
> > +	} else if (tc_type == TC_G210_40BIT) {
> > +		data->ops.phy_initialization = tc_dwc_g210_config_40_bit;
> > +	} else {
> > +		dev_err(&pdev->dev, "test chip version not specified\n");
> > +		return -EPERM;
> > +	}
> > +
> > +	return 0;
> > +}
> > +
> >  static int tc_dwc_pci_suspend(struct device *dev)  {
> >  	return ufshcd_system_suspend(dev_get_drvdata(dev));
> > @@ -48,14 +67,6 @@ static int tc_dwc_pci_runtime_idle(struct device *dev)
> >  	return ufshcd_runtime_idle(dev_get_drvdata(dev));
> >  }
> > 
> > -/*
> > - * struct ufs_hba_dwc_vops - UFS DWC specific variant operations
> > - */
> > -static struct ufs_hba_variant_ops tc_dwc_pci_hba_vops = {
> > -	.name                   = "tc-dwc-pci",
> > -	.link_startup_notify	= ufshcd_dwc_link_startup_notify,
> > -};
> > -
> >  /**
> >   * tc_dwc_pci_shutdown - main function to put the controller in reset state
> >   * @pdev: pointer to PCI device handle
> > @@ -89,22 +100,11 @@ static void tc_dwc_pci_remove(struct pci_dev *pdev)
> > static int  tc_dwc_pci_probe(struct pci_dev *pdev, const struct pci_device_id
> > *id)  {
> > -	struct ufs_hba *hba;
> > +	struct tc_dwc_data *data = (struct tc_dwc_data *)id->driver_data;
> >  	void __iomem *mmio_base;
> > +	struct ufs_hba *hba;
> >  	int err;
> > 
> > -	/* Check Test Chip type and set the specific setup routine */
> > -	if (tc_type == TC_G210_20BIT) {
> > -		tc_dwc_pci_hba_vops.phy_initialization =
> > -						tc_dwc_g210_config_20_bit;
> > -	} else if (tc_type == TC_G210_40BIT) {
> > -		tc_dwc_pci_hba_vops.phy_initialization =
> > -						tc_dwc_g210_config_40_bit;
> > -	} else {
> > -		dev_err(&pdev->dev, "test chip version not specified\n");
> > -		return -EPERM;
> > -	}
> > -
> >  	err = pcim_enable_device(pdev);
> >  	if (err) {
> >  		dev_err(&pdev->dev, "pcim_enable_device failed\n"); @@ -
> > 127,7 +127,16 @@ tc_dwc_pci_probe(struct pci_dev *pdev, const struct
> > pci_device_id *id)
> >  		return err;
> >  	}
> > 
> > -	hba->vops = &tc_dwc_pci_hba_vops;
> > +	/* Check Test Chip type and set the specific setup routine */
> > +	if (data && data->setup) {
> > +		err = data->setup(pdev, data);
> > +		if (err)
> > +			return err;
> > +	} else {
> > +		return -ENOENT;
> > +	}
> > +
> > +	hba->vops = &data->ops;
> > 
> >  	err = ufshcd_init(hba, mmio_base, pdev->irq);
> >  	if (err) {
> > @@ -150,9 +159,20 @@ static const struct dev_pm_ops tc_dwc_pci_pm_ops
> > = {
> >  	.runtime_idle    = tc_dwc_pci_runtime_idle,
> >  };
> > 
> > +static struct tc_dwc_data tc_dwc_g210_data = {
> 
> Constify the struct, if possible. 

Actually, I can't because I overwrite one of the ops callback in the 
probe() depending on TC specified.

---
Thanks,
Jose Miguel Abreu