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Message-ID: <20230913141528.00000781@Huawei.com>
Date: Wed, 13 Sep 2023 14:15:28 +0100
From: Jonathan Cameron <Jonathan.Cameron@...wei.com>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
CC: <linux-pci@...r.kernel.org>, Bjorn Helgaas <helgaas@...nel.org>,
"Bradley Grove" <linuxdrivers@...otech.com>,
"James E.J. Bottomley" <jejb@...ux.ibm.com>,
"Martin K. Petersen" <martin.petersen@...cle.com>,
<linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 07/10] scsi: esas2r: Use FIELD_GET() to extract PCIe
capability fields
On Wed, 13 Sep 2023 15:27:45 +0300
Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com> wrote:
> Use FIELD_GET() to extract PCIe capability register fields instead of
> custom masking and shifting. Also remove the unnecessary cast to u8,
> the value in those fields always fits to u8.
>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> ---
> drivers/scsi/esas2r/esas2r_ioctl.c | 16 ++++++----------
> 1 file changed, 6 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/scsi/esas2r/esas2r_ioctl.c b/drivers/scsi/esas2r/esas2r_ioctl.c
> index 055d2e87a2c8..3f7c1d131ec3 100644
> --- a/drivers/scsi/esas2r/esas2r_ioctl.c
> +++ b/drivers/scsi/esas2r/esas2r_ioctl.c
> @@ -41,6 +41,8 @@
> * USA.
> */
>
> +#include <linux/bitfield.h>
> +
> #include "esas2r.h"
>
> /*
> @@ -792,16 +794,10 @@ static int hba_ioctl_callback(struct esas2r_adapter *a,
> pcie_capability_read_dword(a->pcid, PCI_EXP_LNKCAP,
> &caps);
>
> - gai->pci.link_speed_curr =
> - (u8)(stat & PCI_EXP_LNKSTA_CLS);
> - gai->pci.link_speed_max =
> - (u8)(caps & PCI_EXP_LNKCAP_SLS);
> - gai->pci.link_width_curr =
> - (u8)((stat & PCI_EXP_LNKSTA_NLW)
> - >> PCI_EXP_LNKSTA_NLW_SHIFT);
> - gai->pci.link_width_max =
> - (u8)((caps & PCI_EXP_LNKCAP_MLW)
> - >> 4);
> + gai->pci.link_speed_curr = FIELD_GET(PCI_EXP_LNKSTA_CLS, stat);
> + gai->pci.link_speed_max = FIELD_GET(PCI_EXP_LNKCAP_SLS, caps);
> + gai->pci.link_width_curr = FIELD_GET(PCI_EXP_LNKSTA_NLW, stat);
> + gai->pci.link_width_max = FIELD_GET(PCI_EXP_LNKCAP_MLW, caps);
> }
>
> gai->pci.msi_vector_cnt = 1;
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