4.19-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
commit b3943b3c2971444364e03224cfc828c5789deada upstream.
Ever since introduction in the commit 0c8173385e54 ("rtl8192ce: Add new
driver") the rtlwifi code has, according to comments, attempted to
disable/enable ASPM of the upstream bridge by writing into its LNKCTL
register. However, the code has never been correct because it performs
the writes to the device instead of the upstream bridge.
Worse yet, the offset where the PCIe capabilities reside is derived
from the offset of the upstream bridge. As a result, the write will use
an offset on the device that does not relate to the LNKCTL register
making the ASPM disable/enable code outright dangerous.
Because of those problems, there is no indication that the driver needs
disable/enable ASPM on the upstream bridge. As the Capabilities offset
is not correctly calculated for the write to target device's LNKCTL
register, the code is not disabling/enabling device's ASPM either.
Therefore, just remove the upstream bridge related ASPM disable/enable
code entirely.
The upstream bridge related ASPM code was the only user of the struct
mp_adapter members num4bytes, pcibridge_pciehdr_offset, and
pcibridge_linkctrlreg so those are removed as well.
Note: This change does not remove the code related to changing the
device's ASPM on purpose (which is independent of this flawed code
related to upstream bridge's ASPM).
Suggested-by: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Fixes: 0c8173385e54 ("rtl8192ce: Add new driver")
Fixes: 886e14b65a8f ("rtlwifi: Eliminate raw reads and writes from PCIe portion")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231124084725.12738-2-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/net/wireless/realtek/rtlwifi/pci.c | 58 -----------------------------
drivers/net/wireless/realtek/rtlwifi/pci.h | 5 --
2 files changed, 1 insertion(+), 62 deletions(-)
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -214,11 +214,8 @@ static void rtl_pci_disable_aspm(struct
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
u8 pcibridge_vendor = pcipriv->ndis_adapter.pcibridge_vendor;
- u8 num4bytes = pcipriv->ndis_adapter.num4bytes;
/*Retrieve original configuration settings. */
u8 linkctrl_reg = pcipriv->ndis_adapter.linkctrl_reg;
- u16 pcibridge_linkctrlreg = pcipriv->ndis_adapter.
- pcibridge_linkctrlreg;
u16 aspmlevel = 0;
u8 tmp_u1b = 0;
@@ -243,16 +240,8 @@ static void rtl_pci_disable_aspm(struct
/*Set corresponding value. */
aspmlevel |= BIT(0) | BIT(1);
linkctrl_reg &= ~aspmlevel;
- pcibridge_linkctrlreg &= ~(BIT(0) | BIT(1));
_rtl_pci_platform_switch_device_pci_aspm(hw, linkctrl_reg);
- udelay(50);
-
- /*4 Disable Pci Bridge ASPM */
- pci_write_config_byte(rtlpci->pdev, (num4bytes << 2),
- pcibridge_linkctrlreg);
-
- udelay(50);
}
/*Enable RTL8192SE ASPM & Enable Pci Bridge ASPM for
@@ -267,9 +256,7 @@ static void rtl_pci_enable_aspm(struct i
struct rtl_ps_ctl *ppsc = rtl_psc(rtl_priv(hw));
struct rtl_pci *rtlpci = rtl_pcidev(rtl_pcipriv(hw));
u8 pcibridge_vendor = pcipriv->ndis_adapter.pcibridge_vendor;
- u8 num4bytes = pcipriv->ndis_adapter.num4bytes;
u16 aspmlevel;
- u8 u_pcibridge_aspmsetting;
u8 u_device_aspmsetting;
if (!ppsc->support_aspm)
@@ -281,25 +268,6 @@ static void rtl_pci_enable_aspm(struct i
return;
}
- /*4 Enable Pci Bridge ASPM */
-
- u_pcibridge_aspmsetting =
- pcipriv->ndis_adapter.pcibridge_linkctrlreg |
- rtlpci->const_hostpci_aspm_setting;
-
- if (pcibridge_vendor == PCI_BRIDGE_VENDOR_INTEL)
- u_pcibridge_aspmsetting &= ~BIT(0);
-
- pci_write_config_byte(rtlpci->pdev, (num4bytes << 2),
- u_pcibridge_aspmsetting);
-
- rtl_dbg(rtlpriv, COMP_INIT, DBG_LOUD,
- "PlatformEnableASPM(): Write reg[%x] = %x\n",
- (pcipriv->ndis_adapter.pcibridge_pciehdr_offset + 0x10),
- u_pcibridge_aspmsetting);
-
- udelay(50);
-
/*Get ASPM level (with/without Clock Req) */
aspmlevel = rtlpci->const_devicepci_aspm_setting;
u_device_aspmsetting = pcipriv->ndis_adapter.linkctrl_reg;
@@ -381,22 +349,6 @@ static bool rtl_pci_check_buddy_priv(str
return find_buddy_priv;
}
-static void rtl_pci_get_linkcontrol_field(struct ieee80211_hw *hw)
-{
- struct rtl_pci_priv *pcipriv = rtl_pcipriv(hw);
- struct rtl_pci *rtlpci = rtl_pcidev(pcipriv);
- u8 capabilityoffset = pcipriv->ndis_adapter.pcibridge_pciehdr_offset;
- u8 linkctrl_reg;
- u8 num4bbytes;
-
- num4bbytes = (capabilityoffset + 0x10) / 4;
-
- /*Read Link Control Register */
- pci_read_config_byte(rtlpci->pdev, (num4bbytes << 2), &linkctrl_reg);
-
- pcipriv->ndis_adapter.pcibridge_linkctrlreg = linkctrl_reg;
-}
-
static void rtl_pci_parse_configuration(struct pci_dev *pdev,
struct ieee80211_hw *hw)
{
@@ -2063,12 +2015,6 @@ static bool _rtl_pci_find_adapter(struct
PCI_SLOT(bridge_pdev->devfn);
pcipriv->ndis_adapter.pcibridge_funcnum =
PCI_FUNC(bridge_pdev->devfn);
- pcipriv->ndis_adapter.pcibridge_pciehdr_offset =
- pci_pcie_cap(bridge_pdev);
- pcipriv->ndis_adapter.num4bytes =
- (pcipriv->ndis_adapter.pcibridge_pciehdr_offset + 0x10) / 4;
-
- rtl_pci_get_linkcontrol_field(hw);
if (pcipriv->ndis_adapter.pcibridge_vendor ==
PCI_BRIDGE_VENDOR_AMD) {
@@ -2085,13 +2031,11 @@ static bool _rtl_pci_find_adapter(struct
pdev->vendor, pcipriv->ndis_adapter.linkctrl_reg);
rtl_dbg(rtlpriv, COMP_INIT, DBG_DMESG,
- "pci_bridge busnumber:devnumber:funcnumber:vendor:pcie_cap:link_ctl_reg:amd %d:%d:%d:%x:%x:%x:%x\n",
+ "pci_bridge busnumber:devnumber:funcnumber:vendor:amd %d:%d:%d:%x:%x\n",
pcipriv->ndis_adapter.pcibridge_busnum,
pcipriv->ndis_adapter.pcibridge_devnum,
pcipriv->ndis_adapter.pcibridge_funcnum,
pcibridge_vendors[pcipriv->ndis_adapter.pcibridge_vendor],
- pcipriv->ndis_adapter.pcibridge_pciehdr_offset,
- pcipriv->ndis_adapter.pcibridge_linkctrlreg,
pcipriv->ndis_adapter.amd_l1_patch);
rtl_pci_parse_configuration(pdev, hw);
--- a/drivers/net/wireless/realtek/rtlwifi/pci.h
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.h
@@ -258,11 +258,6 @@ struct mp_adapter {
u16 pcibridge_vendorid;
u16 pcibridge_deviceid;
- u8 num4bytes;
-
- u8 pcibridge_pciehdr_offset;
- u8 pcibridge_linkctrlreg;
-
bool amd_l1_patch;
};
