Hi, On Wed, Oct 23, 2013 at 12:55:43PM +0800, Tim Harvey wrote: > The IMX6 iATU is used for address translation between the AXI bus > address space and PCI address space. This is used for type0 and type1 > config cycles but is not necessary for outbound io/mem regions. > > This patch removes the calls that inappropriately re-configures the ATU > viewport for outbound memory and IO after config cycles and removes them > altogether as they are not necessary. > > This resolves issues with PCI devices behind switches and has been tested with > a Gige device behind a PLX PEX860x switch. More testing is needed for other > configurations. It seems to me that in your controller you have only one view port. Also mem_base and mem_bus_addr is same. Thats why it works in your case. I would suggest to wait for Kishon's work who would be trying to optimize viewport allocations. Regards Pratyush > > Signed-off-by: Tim Harvey <tharvey@xxxxxxxxxxxxx> > --- > drivers/pci/host/pcie-designware.c | 41 +++--------------------------------- > 1 file changed, 3 insertions(+), 38 deletions(-) > > diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c > index 5d1f268..6cce779 100644 > --- a/drivers/pci/host/pcie-designware.c > +++ b/drivers/pci/host/pcie-designware.c > @@ -46,7 +46,6 @@ > #define PCIE_ATU_VIEWPORT 0x900 > #define PCIE_ATU_REGION_INBOUND (0x1 << 31) > #define PCIE_ATU_REGION_OUTBOUND (0x0 << 31) > -#define PCIE_ATU_REGION_INDEX1 (0x1 << 0) > #define PCIE_ATU_REGION_INDEX0 (0x0 << 0) > #define PCIE_ATU_CR1 0x904 > #define PCIE_ATU_TYPE_MEM (0x0 << 0) > @@ -502,8 +501,8 @@ static void dw_pcie_prog_viewport_cfg0(struct pcie_port *pp, u32 busdev) > > static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev) > { > - /* Program viewport 1 : OUTBOUND : CFG1 */ > - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1, > + /* Program viewport 0 : OUTBOUND : CFG1 */ > + dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0, > PCIE_ATU_VIEWPORT); > dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1); > dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > @@ -513,38 +512,8 @@ static void dw_pcie_prog_viewport_cfg1(struct pcie_port *pp, u32 busdev) > PCIE_ATU_LIMIT); > dw_pcie_writel_rc(pp, busdev, PCIE_ATU_LOWER_TARGET); > dw_pcie_writel_rc(pp, 0, PCIE_ATU_UPPER_TARGET); > -} > - > -static void dw_pcie_prog_viewport_mem_outbound(struct pcie_port *pp) > -{ > - /* Program viewport 0 : OUTBOUND : MEM */ > - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX0, > - PCIE_ATU_VIEWPORT); > - dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_MEM, PCIE_ATU_CR1); > - dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > - dw_pcie_writel_rc(pp, pp->mem_base, PCIE_ATU_LOWER_BASE); > - dw_pcie_writel_rc(pp, (pp->mem_base >> 32), PCIE_ATU_UPPER_BASE); > - dw_pcie_writel_rc(pp, pp->mem_base + pp->config.mem_size - 1, > - PCIE_ATU_LIMIT); > - dw_pcie_writel_rc(pp, pp->config.mem_bus_addr, PCIE_ATU_LOWER_TARGET); > - dw_pcie_writel_rc(pp, upper_32_bits(pp->config.mem_bus_addr), > - PCIE_ATU_UPPER_TARGET); > -} > - > -static void dw_pcie_prog_viewport_io_outbound(struct pcie_port *pp) > -{ > - /* Program viewport 1 : OUTBOUND : IO */ > - dw_pcie_writel_rc(pp, PCIE_ATU_REGION_OUTBOUND | PCIE_ATU_REGION_INDEX1, > - PCIE_ATU_VIEWPORT); > - dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_IO, PCIE_ATU_CR1); > + dw_pcie_writel_rc(pp, PCIE_ATU_TYPE_CFG1, PCIE_ATU_CR1); > dw_pcie_writel_rc(pp, PCIE_ATU_ENABLE, PCIE_ATU_CR2); > - dw_pcie_writel_rc(pp, pp->io_base, PCIE_ATU_LOWER_BASE); > - dw_pcie_writel_rc(pp, (pp->io_base >> 32), PCIE_ATU_UPPER_BASE); > - dw_pcie_writel_rc(pp, pp->io_base + pp->config.io_size - 1, > - PCIE_ATU_LIMIT); > - dw_pcie_writel_rc(pp, pp->config.io_bus_addr, PCIE_ATU_LOWER_TARGET); > - dw_pcie_writel_rc(pp, upper_32_bits(pp->config.io_bus_addr), > - PCIE_ATU_UPPER_TARGET); > } > > static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, > @@ -560,11 +529,9 @@ static int dw_pcie_rd_other_conf(struct pcie_port *pp, struct pci_bus *bus, > if (bus->parent->number == pp->root_bus_nr) { > dw_pcie_prog_viewport_cfg0(pp, busdev); > ret = cfg_read(pp->va_cfg0_base + address, where, size, val); > - dw_pcie_prog_viewport_mem_outbound(pp); > } else { > dw_pcie_prog_viewport_cfg1(pp, busdev); > ret = cfg_read(pp->va_cfg1_base + address, where, size, val); > - dw_pcie_prog_viewport_io_outbound(pp); > } > > return ret; > @@ -583,11 +550,9 @@ static int dw_pcie_wr_other_conf(struct pcie_port *pp, struct pci_bus *bus, > if (bus->parent->number == pp->root_bus_nr) { > dw_pcie_prog_viewport_cfg0(pp, busdev); > ret = cfg_write(pp->va_cfg0_base + address, where, size, val); > - dw_pcie_prog_viewport_mem_outbound(pp); > } else { > dw_pcie_prog_viewport_cfg1(pp, busdev); > ret = cfg_write(pp->va_cfg1_base + address, where, size, val); > - dw_pcie_prog_viewport_io_outbound(pp); > } > > return ret; > -- > 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html