linux-kernel - [PATCH v2 07/10] scsi: esas2r: Use FIELD_GET() to extract PCIe capability fields

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Message-Id: <20230913122748.29530-8-ilpo.jarvinen@linux.intel.com>
Date:   Wed, 13 Sep 2023 15:27:45 +0300
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        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
Cc:     Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: [PATCH v2 07/10] scsi: esas2r: Use FIELD_GET() to extract PCIe capability fields

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>
---
 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;
-- 
2.30.2