On 7/9/2019 7:44 PM, Bjorn Helgaas wrote:

On Mon, Jul 01, 2019 at 06:09:59PM +0530, Vidya Sagar wrote:

quoted

Add #defines only for the Data Link Feature and Physical Layer 16.0 GT/s
features.

Signed-off-by: Vidya Sagar <redacted>
Reviewed-by: Thierry Reding <redacted>

Please include spec references in the commit log, e.g., PCIe r5.0, sec
7.7.4, for Data Link Feature and sec 7.7.5 for Physical Layer 16 GT/s.

Done.

quoted

  include/uapi/linux/pci_regs.h | 22 +++++++++++++++++++++-
  1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index f28e562d7ca8..1c79f6a097d2 100644
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h

@@ -713,7 +713,9 @@
  #define PCI_EXT_CAP_ID_DPC	0x1D	/* Downstream Port Containment */
  #define PCI_EXT_CAP_ID_L1SS	0x1E	/* L1 PM Substates */
  #define PCI_EXT_CAP_ID_PTM	0x1F	/* Precision Time Measurement */
-#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PTM
+#define PCI_EXT_CAP_ID_DLF	0x25	/* Data Link Feature */
+#define PCI_EXT_CAP_ID_PL	0x26	/* Physical Layer 16.0 GT/s */

Maybe PCI_EXT_CAP_ID_PL_16GT so there's a little more hint of what
this is for?

Ok. I'll add 16GT.

quoted

+#define PCI_EXT_CAP_ID_MAX	PCI_EXT_CAP_ID_PL
  
  #define PCI_EXT_CAP_DSN_SIZEOF	12
  #define PCI_EXT_CAP_MCAST_ENDPOINT_SIZEOF 40

@@ -1053,4 +1055,22 @@
  #define  PCI_L1SS_CTL1_LTR_L12_TH_SCALE	0xe0000000  /* LTR_L1.2_THRESHOLD_Scale */
  #define PCI_L1SS_CTL2		0x0c	/* Control 2 Register */
  
+/* Data Link Feature */
+#define PCI_DLF_CAP		0x04	/* Capabilities Register */
+#define  PCI_DLF_LOCAL_DLF_SUP_MASK	0x007fffff  /* Local Data Link Feature Supported */
+#define  PCI_DLF_EXCHANGE_ENABLE	0x80000000  /* Data Link Feature Exchange Enable */
+#define PCI_DLF_STS		0x08	/* Status Register */
+#define  PCI_DLF_REMOTE_DLF_SUP_MASK	0x007fffff  /* Remote Data Link Feature Supported */
+#define  PCI_DLF_REMOTE_DLF_SUP_VALID	0x80000000  /* Remote Data Link Feature Support Valid */

I'm a little bit ambivalent about adding #defines that aren't used.  I
personally would probably just add the things we use, so the header
file gives a clue about what's currently implemented.  But I guess
either way is fine.

Fine. I'll remove all unused defines in the next patch.

quoted

+/* Physical Layer 16.0 GT/s */
+#define PCI_PL_16GT_CAP		0x04	/* Capabilities Register */
+#define PCI_PL_16GT_CTRL	0x08	/* Control Register */
+#define PCI_PL_16GT_STS		0x0c	/* Status Register */
+#define PCI_PL_16GT_LDPM_STS	0x10	/* Local Data Parity Mismatch Status Register */
+#define PCI_PL_16GT_FRDPM_STS	0x14	/* First Retimer Data Parity Mismatch Status Register */
+#define PCI_PL_16GT_SRDPM_STS	0x18	/* Second Retimer Data Parity Mismatch Status Register */
+#define PCI_PL_16GT_RSVD	0x1C	/* Reserved */

Use lower-case hex consistently here.  There's no global consistency
in this file, but we can at least be consistent in each section.  But
I'm even more hesitant about included unused #defines for "reserved"
fields, so if you drop this it would take care of both :)

Done.

quoted

+#define PCI_PL_16GT_LE_CTRL	0x20	/* Lane Equalization Control Register */

This is the only register you actually use.  You defined a local
PL16G_CAP_OFF_DSP_16G_TX_PRESET_MASK for this register.  Shouldn't
that be defined here instead of in
drivers/pci/controller/dwc/pcie-tegra194.c?

I'll take care of it in the next patch.

quoted

  #endif /* LINUX_PCI_REGS_H */
-- 
2.17.1

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel