| Message ID | 20240617-pci2_upstream-v6-6-e0821238f997@nxp.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | PCI: imx6: Fix\rename\clean up and add lut information for imx95 | expand |
On Mon, Jun 17, 2024 at 04:16:42PM -0400, Frank Li wrote: > Improve comment about workaround ERR010727 by using official errata > document content. > It is useful to provide a link to the errata document in the commit message. > Signed-off-by: Frank Li <Frank.Li@nxp.com> > --- > drivers/pci/controller/dwc/pci-imx6.c | 22 +++++++++++++++++++--- > 1 file changed, 19 insertions(+), 3 deletions(-) > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c > index 6f68bee111029..6e3ac3fc33745 100644 > --- a/drivers/pci/controller/dwc/pci-imx6.c > +++ b/drivers/pci/controller/dwc/pci-imx6.c > @@ -715,9 +715,25 @@ static int imx7d_pcie_core_reset(struct imx_pcie *imx_pcie, bool assert) > return 0; > > /* > - * Workaround for ERR010728, failure of PCI-e PLL VCO to > - * oscillate, especially when cold. This turns off "Duty-cycle > - * Corrector" and other mysterious undocumented things. > + * Workaround for ERR010728 (IMX7DS_2N09P, Rev. 1.1, 4/2023): > + * > + * PCIe: PLL may fail to lock under corner conditions Initial VCO Missing full stop after 'conditions'? - Mani
On Mon, Jun 17, 2024 at 5:17 PM Frank Li <Frank.Li@nxp.com> wrote: > > Improve comment about workaround ERR010727 by using official errata This should be ERR010728, not ERR010727.
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c index 6f68bee111029..6e3ac3fc33745 100644 --- a/drivers/pci/controller/dwc/pci-imx6.c +++ b/drivers/pci/controller/dwc/pci-imx6.c @@ -715,9 +715,25 @@ static int imx7d_pcie_core_reset(struct imx_pcie *imx_pcie, bool assert) return 0; /* - * Workaround for ERR010728, failure of PCI-e PLL VCO to - * oscillate, especially when cold. This turns off "Duty-cycle - * Corrector" and other mysterious undocumented things. + * Workaround for ERR010728 (IMX7DS_2N09P, Rev. 1.1, 4/2023): + * + * PCIe: PLL may fail to lock under corner conditions Initial VCO + * oscillation may fail under corner conditions such as cold + * temperature which will cause the PCIe PLL fail to lock in the + * initialization phase. + * + * The Duty-cycle Corrector calibration must be disabled. + * + * 1. De-assert the G_RST signal by clearing + * SRC_PCIEPHY_RCR[PCIEPHY_G_RST]. + * 2. De-assert DCC_FB_EN by writing data “0x29” to the register + * address 0x306d0014 (PCIE_PHY_CMN_REG4). + * 3. Assert RX_EQS, RX_EQ_SEL by writing data “0x48” to the register + * address 0x306d0090 (PCIE_PHY_CMN_REG24). + * 4. Assert ATT_MODE by writing data “0xbc” to the register + * address 0x306d0098 (PCIE_PHY_CMN_REG26). + * 5. De-assert the CMN_RST signal by clearing register bit + * SRC_PCIEPHY_RCR[PCIEPHY_BTN] */ if (likely(imx_pcie->phy_base)) {
Improve comment about workaround ERR010727 by using official errata document content. Signed-off-by: Frank Li <Frank.Li@nxp.com> --- drivers/pci/controller/dwc/pci-imx6.c | 22 +++++++++++++++++++--- 1 file changed, 19 insertions(+), 3 deletions(-)