diff mbox series

[05/13] PCI: dwc: Ensure all outbound ATU windows are reset

Message ID 20201028204646.356535-6-robh@kernel.org
State Not Applicable
Headers show
Series PCI: dwc: Another round of clean-ups | expand

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Context Check Description
snowpatch_ozlabs/needsstable success Patch has no Fixes tags
snowpatch_ozlabs/checkpatch success
snowpatch_ozlabs/apply_patch success Successfully applied on branch powerpc/merge (8cb17737940b156329cb5210669b9c9b23f4dd56)

Commit Message

Rob Herring Oct. 28, 2020, 8:46 p.m. UTC
The Layerscape driver clears the ATU registers which may have been
configured by the bootloader. Any driver could have the same issue
and doing it for all drivers doesn't hurt, so let's move it into the
common DWC code.

Cc: Minghuan Lian <minghuan.Lian@nxp.com>
Cc: Mingkai Hu <mingkai.hu@nxp.com>
Cc: Roy Zang <roy.zang@nxp.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Jingoo Han <jingoohan1@gmail.com>
Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: linuxppc-dev@lists.ozlabs.org
Signed-off-by: Rob Herring <robh@kernel.org>
---
 drivers/pci/controller/dwc/pci-layerscape.c       | 14 --------------
 drivers/pci/controller/dwc/pcie-designware-host.c |  5 +++++
 2 files changed, 5 insertions(+), 14 deletions(-)

Comments

Jingoo Han Oct. 29, 2020, 10:12 p.m. UTC | #1
On 10/28/20, 4:47 PM, Rob Herring wrote:
> 
> The Layerscape driver clears the ATU registers which may have been
> configured by the bootloader. Any driver could have the same issue
> and doing it for all drivers doesn't hurt, so let's move it into the
> common DWC code.
>
> Cc: Minghuan Lian <minghuan.Lian@nxp.com>
> Cc: Mingkai Hu <mingkai.hu@nxp.com>
> Cc: Roy Zang <roy.zang@nxp.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Bjorn Helgaas <bhelgaas@google.com>
> Cc: Jingoo Han <jingoohan1@gmail.com>

Acked-by: Jingoo Han <jingoohan1@gmail.com>

Best regards,
Jingoo Han

> Cc: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
> Cc: linuxppc-dev@lists.ozlabs.org
> Signed-off-by: Rob Herring <robh@kernel.org>
> ---
>  drivers/pci/controller/dwc/pci-layerscape.c       | 14 --------------
>  drivers/pci/controller/dwc/pcie-designware-host.c |  5 +++++
>  2 files changed, 5 insertions(+), 14 deletions(-)
>
>  diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
>  index f24f79a70d9a..53e56d54c482 100644
>  --- a/drivers/pci/controller/dwc/pci-layerscape.c
>  +++ b/drivers/pci/controller/dwc/pci-layerscape.c
>  @@ -83,14 +83,6 @@ static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
>   	iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
>   }
>  
>  -static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
>  -{
>  -	int i;
>  -
>  -	for (i = 0; i < PCIE_IATU_NUM; i++)
>  -		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
>  -}
>  -
>   static int ls1021_pcie_link_up(struct dw_pcie *pci)
>   {
>   	u32 state;
>  @@ -136,12 +128,6 @@ static int ls_pcie_host_init(struct pcie_port *pp)
>   	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>   	struct ls_pcie *pcie = to_ls_pcie(pci);
>  
>  -	/*
>  -	 * Disable outbound windows configured by the bootloader to avoid
>  -	 * one transaction hitting multiple outbound windows.
>  -	 * dw_pcie_setup_rc() will reconfigure the outbound windows.
>  -	 */
>  -	ls_pcie_disable_outbound_atus(pcie);
>   	ls_pcie_fix_error_response(pcie);
>  
>   	dw_pcie_dbi_ro_wr_en(pci);
>  diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
>  index cde45b2076ee..265a48f1a0ae 100644
>  --- a/drivers/pci/controller/dwc/pcie-designware-host.c
>  +++ b/drivers/pci/controller/dwc/pcie-designware-host.c
>  @@ -534,6 +534,7 @@ static struct pci_ops dw_pcie_ops = {
>  
>   void dw_pcie_setup_rc(struct pcie_port *pp)
>   {
>  +	int i;
>   	u32 val, ctrl, num_ctrls;
>   	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
>  
>  @@ -583,6 +584,10 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
>   		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
>   	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
>  
>  +	/* Ensure all outbound windows are disabled so there are multiple matches */
>  +	for (i = 0; i < pci->num_viewport; i++)
>  +		dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);
>  +
>   	/*
>   	 * If the platform provides its own child bus config accesses, it means
>   	 * the platform uses its own address translation component rather than
>  -- 
>  2.25.1
diff mbox series

Patch

diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c
index f24f79a70d9a..53e56d54c482 100644
--- a/drivers/pci/controller/dwc/pci-layerscape.c
+++ b/drivers/pci/controller/dwc/pci-layerscape.c
@@ -83,14 +83,6 @@  static void ls_pcie_drop_msg_tlp(struct ls_pcie *pcie)
 	iowrite32(val, pci->dbi_base + PCIE_STRFMR1);
 }
 
-static void ls_pcie_disable_outbound_atus(struct ls_pcie *pcie)
-{
-	int i;
-
-	for (i = 0; i < PCIE_IATU_NUM; i++)
-		dw_pcie_disable_atu(pcie->pci, i, DW_PCIE_REGION_OUTBOUND);
-}
-
 static int ls1021_pcie_link_up(struct dw_pcie *pci)
 {
 	u32 state;
@@ -136,12 +128,6 @@  static int ls_pcie_host_init(struct pcie_port *pp)
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 	struct ls_pcie *pcie = to_ls_pcie(pci);
 
-	/*
-	 * Disable outbound windows configured by the bootloader to avoid
-	 * one transaction hitting multiple outbound windows.
-	 * dw_pcie_setup_rc() will reconfigure the outbound windows.
-	 */
-	ls_pcie_disable_outbound_atus(pcie);
 	ls_pcie_fix_error_response(pcie);
 
 	dw_pcie_dbi_ro_wr_en(pci);
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index cde45b2076ee..265a48f1a0ae 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -534,6 +534,7 @@  static struct pci_ops dw_pcie_ops = {
 
 void dw_pcie_setup_rc(struct pcie_port *pp)
 {
+	int i;
 	u32 val, ctrl, num_ctrls;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 
@@ -583,6 +584,10 @@  void dw_pcie_setup_rc(struct pcie_port *pp)
 		PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
 	dw_pcie_writel_dbi(pci, PCI_COMMAND, val);
 
+	/* Ensure all outbound windows are disabled so there are multiple matches */
+	for (i = 0; i < pci->num_viewport; i++)
+		dw_pcie_disable_atu(pci, i, DW_PCIE_REGION_OUTBOUND);
+
 	/*
 	 * If the platform provides its own child bus config accesses, it means
 	 * the platform uses its own address translation component rather than