On Mon, Nov 2, 2020 at 14:27:9, Vidya Sagar <[email protected]> wrote:
> > > On 11/2/2020 7:45 PM, Rob Herring wrote: > > External email: Use caution opening links or attachments > > > > > > On Thu, Oct 29, 2020 at 12:40 AM Vidya Sagar <[email protected]> wrote: > >> > >> DesignWare core has a TLP digest (TD) override bit in one of the control > >> registers of ATU. This bit also needs to be programmed for proper ECRC > >> functionality. This is currently identified as an issue with DesignWare > >> IP version 4.90a. This patch does the required programming in ATU upon > >> querying the system policy for ECRC. > >> > >> Signed-off-by: Vidya Sagar <[email protected]> > >> Reviewed-by: Jingoo Han <[email protected]> > >> --- > >> V3: > >> * Added 'Reviewed-by: Jingoo Han <[email protected]>' > >> > >> V2: > >> * Addressed Jingoo's review comment > >> * Removed saving 'td' bit information in 'dw_pcie' structure > >> > >> drivers/pci/controller/dwc/pcie-designware.c | 8 ++++++-- > >> drivers/pci/controller/dwc/pcie-designware.h | 1 + > >> 2 files changed, 7 insertions(+), 2 deletions(-) > >> > >> diff --git a/drivers/pci/controller/dwc/pcie-designware.c > >> b/drivers/pci/controller/dwc/pcie-designware.c > >> index b5e438b70cd5..cbd651b219d2 100644 > >> --- a/drivers/pci/controller/dwc/pcie-designware.c > >> +++ b/drivers/pci/controller/dwc/pcie-designware.c > >> @@ -246,6 +246,8 @@ static void dw_pcie_prog_outbound_atu_unroll(struct > >> dw_pcie *pci, u8 func_no, > >> dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_UPPER_TARGET, > >> upper_32_bits(pci_addr)); > >> val = type | PCIE_ATU_FUNC_NUM(func_no); > >> + if (pci->version == 0x490A) > >> + val = val | pcie_is_ecrc_enabled() << PCIE_ATU_TD_SHIFT; > >> val = upper_32_bits(size - 1) ? > >> val | PCIE_ATU_INCREASE_REGION_SIZE : val; > >> dw_pcie_writel_ob_unroll(pci, index, PCIE_ATU_UNR_REGION_CTRL1, > >> val); > >> @@ -294,8 +296,10 @@ static void __dw_pcie_prog_outbound_atu(struct > >> dw_pcie *pci, u8 func_no, > >> lower_32_bits(pci_addr)); > >> dw_pcie_writel_dbi(pci, PCIE_ATU_UPPER_TARGET, > >> upper_32_bits(pci_addr)); > >> - dw_pcie_writel_dbi(pci, PCIE_ATU_CR1, type | > >> - PCIE_ATU_FUNC_NUM(func_no)); > >> + val = type | PCIE_ATU_FUNC_NUM(func_no); > >> + if (pci->version == 0x490A) > > > > Is this even possible? Are the non-unroll ATU registers available post 4.80? > I'm not sure. Gustavo might have information about this. I made this > change so that it is taken care off even if they available. The Synopsys DesignWare PCIe IP is highly configurable, therefore is dependable on what the design team has configured for their solution. Although Synopsys doesn't recommend the use of non-unroll ATU, the customers are free to select what they want for their design. -Gustavo > > > > > Rob > >
