linux-kernel - [PATCH 1/2] [RFC] PCI: read revision ID by default

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Date:	Fri, 08 Jun 2007 15:46:30 -0700
From:	Auke Kok <auke-jan.h.kok@...el.com>
To:	linux-kernel@...r.kernel.org, linux-pci@...ey.karlin.mff.cuni.cz,
	gregkh@...e.de
Subject: [PATCH 1/2] [RFC] PCI: read revision ID by default

Currently there are 97 occurrences where drivers need the pci
revision ID. We can do this once for all devices. Even the pci
subsystem needs the revision several times for quirks. The extra
u8 member pads out nicely in the pci_dev struct.

Signed-off-by: Auke Kok <auke-jan.h.kok@...el.com>
---

 drivers/pci/probe.c |    3 +++
 include/linux/pci.h |    1 +
 2 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index e48fcf0..0fdb71d 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -918,6 +918,9 @@ pci_scan_device(struct pci_bus *bus, int devfn)
 	dev->cfg_size = pci_cfg_space_size(dev);
 	dev->error_state = pci_channel_io_normal;
 
+	/* read the PCI revision: 1 byte */
+	pci_read_config_byte(dev, PCI_REVISION_ID, &dev->revision);
+
 	/* Assume 32-bit PCI; let 64-bit PCI cards (which are far rarer)
 	   set this higher, assuming the system even supports it.  */
 	dev->dma_mask = 0xffffffff;
diff --git a/include/linux/pci.h b/include/linux/pci.h
index fbf3766..9847936 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -138,6 +138,7 @@ struct pci_dev {
 	unsigned short	subsystem_vendor;
 	unsigned short	subsystem_device;
 	unsigned int	class;		/* 3 bytes: (base,sub,prog-if) */
+	u8		revision;	/* PCI revision, low byte of class word */
 	u8		hdr_type;	/* PCI header type (`multi' flag masked out) */
 	u8		rom_base_reg;	/* which config register controls the ROM */
 	u8		pin;  		/* which interrupt pin this device uses */
-
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