PCI: tegra194: Remove unnecessary MSI enable reg save and restore

The integrated MSI Receiver enable register is always initialized in
dw_pcie_setup_rc() which is also called in resume code path, so we
don't need to save/restore the enable register during suspend/resume.

Link: https://lore.kernel.org/r/20211226074910.2722-1-jszhang@kernel.org
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Vidya Sagar <vidyas@nvidia.com>

diff --git a/drivers/pci/controller/dwc/pcie-tegra194.c b/drivers/pci/controller/dwc/pcie-tegra194.c
index b1b5f83..cc26784 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-tegra194.c
+++ b/drivers/pci/controller/dwc/pcie-tegra194.c
@@ -186,8 +186,6 @@
 #define N_FTS_VAL                                      52
 #define FTS_VAL                                                52
 
-#define PORT_LOGIC_MSI_CTRL_INT_0_EN           0x828
-
 #define GEN3_EQ_CONTROL_OFF                    0x8a8
 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_SHIFT 8
 #define GEN3_EQ_CONTROL_OFF_PSET_REQ_VEC_MASK  GENMASK(23, 8)
@@ -2189,9 +2187,6 @@ static int tegra194_pcie_suspend_noirq(struct device *dev)
        if (!pcie->link_state)
                return 0;
 
-       /* Save MSI interrupt vector */
-       pcie->msi_ctrl_int = dw_pcie_readl_dbi(&pcie->pci,
-                                              PORT_LOGIC_MSI_CTRL_INT_0_EN);
        tegra_pcie_downstream_dev_to_D0(pcie);
        tegra194_pcie_pme_turnoff(pcie);
        tegra_pcie_unconfig_controller(pcie);
@@ -2223,10 +2218,6 @@ static int tegra194_pcie_resume_noirq(struct device *dev)
        if (ret < 0)
                goto fail_host_init;
 
-       /* Restore MSI interrupt vector */
-       dw_pcie_writel_dbi(&pcie->pci, PORT_LOGIC_MSI_CTRL_INT_0_EN,
-                          pcie->msi_ctrl_int);
-
        return 0;
 
 fail_host_init: