Patch set updated for coreboot: PCIEXP_ASPM: Unify code with other PCI-e tuning

[Kyösti Mälkki]

Kyösti Mälkki ([e-mail]) just uploaded a new patch set to gerrit, which you can find at https://review.coreboot.org/17654

-gerrit

commit 9185b130d2d494ddafd37142fcd85f6318ad7a91
Author: Kyösti Mälkki 
Date:   Tue Nov 29 16:08:38 2016 +0200

PCIEXP_ASPM: Unify code with other PCI-e tuning

Error reporting can be enabled together with ASPM, there
    is no other use for function return value.

Change-Id: I58081fac0df5205a5aea65d735d34b375c2af9cd
    Signed-off-by: Kyösti Mälkki 
---
 src/device/pciexp_device.c | 24 +++++++-----------------
 1 file changed, 7 insertions(+), 17 deletions(-)

diff --git a/src/device/pciexp_device.c b/src/device/pciexp_device.c
index 330c7e3..d14ba02 100644
--- a/src/device/pciexp_device.c
+++ b/src/device/pciexp_device.c
@@ -325,15 +325,8 @@ static int pciexp_aspm_latency(device_t root, unsigned root_cap,

/*
  * Enable ASPM on PCIe root port and endpoint.
- *
- * Returns APMC value:
- *   -1 = Error
- *    0 = no ASPM
- *    1 = L0s Enabled
- *    2 = L1 Enabled
- *    3 = L0s and L1 Enabled
  */
-static enum aspm_type pciexp_enable_aspm(device_t root, unsigned root_cap,
+static void pciexp_enable_aspm(device_t root, unsigned root_cap,
    				 device_t endp, unsigned endp_cap)
 {
    const char *aspm_type_str[] = { "None", "L0s", "L1", "L0s and L1" };
@@ -369,10 +362,14 @@ static enum aspm_type pciexp_enable_aspm(device_t root, unsigned root_cap,
    	lnkctl = pci_read_config16(endp, endp_cap + PCI_EXP_LNKCTL);
    	lnkctl |= apmc;
    	pci_write_config16(endp, endp_cap + PCI_EXP_LNKCTL, lnkctl);
+
+		/* Enable ASPM role based error reporting. */
+		devcap = pci_read_config32(endp, endp_cap + PCI_EXP_DEVCAP);
+		devcap |= PCI_EXP_DEVCAP_RBER;
+		pci_write_config32(endp, endp_cap + PCI_EXP_DEVCAP, devcap);
    }

printk(BIOS_INFO, "ASPM: Enabled %s\n", aspm_type_str[apmc]);
-	return apmc;
 }
 #endif /* CONFIG_PCIEXP_ASPM */

@@ -406,14 +403,7 @@ static void pciexp_tune_dev(device_t dev)

#if CONFIG_PCIEXP_ASPM
    /* Check for and enable ASPM */
-	enum aspm_type apmc = pciexp_enable_aspm(root, root_cap, dev, cap);
-
-	if (apmc != PCIE_ASPM_NONE) {
-		/* Enable ASPM role based error reporting. */
-		u32 reg32 = pci_read_config32(dev, cap + PCI_EXP_DEVCAP);
-		reg32 |= PCI_EXP_DEVCAP_RBER;
-		pci_write_config32(dev, cap + PCI_EXP_DEVCAP, reg32);
-	}
+	pciexp_enable_aspm(root, root_cap, dev, cap);
 #endif
 }