linux-kernel - [PATCH V5] PCI: qcom: Fixing broken pcie enumeration for 2_3

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Date:   Mon, 24 Jul 2023 12:04:29 +0530
From:   Sricharan Ramabadhran <quic_srichara@...cinc.com>
To:     <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh@...nel.org>, <mani@...nel.org>,
        <lpieralisi@...nel.org>, <bhelgaas@...gle.com>, <kw@...ux.com>,
        <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-pci@...r.kernel.org>, <gregkh@...uxfoundation.org>,
        <dmitry.baryshkov@...aro.org>
CC:     <quic_srichara@...cinc.com>, <stable@...r.kernel.org>,
        <Stable@...r.kernel.org>
Subject: [PATCH V5] PCI: qcom: Fixing broken pcie enumeration for 2_3_3 configs ops

PARF_SLV_ADDR_SPACE_SIZE_2_3_3 macro is used for IPQ8074 2_3_3 post_init.
PCIe slave addr register offset is 0x358, but was wrongly changed to
0x168 as a part of commit 39171b33f652 ("PCI: qcom: Remove PCIE20_ prefix
from register definitions"). Fixing it, by using the right macro and remove
the unused PARF_SLV_ADDR_SPACE_SIZE_2_3_3.

Without this access to the registers of slave addr space like iATU etc
are broken leading to pcie enumeration failure.

Fixes: 39171b33f652 ("PCI: qcom: Remove PCIE20_ prefix from register definitions")
Cc: <Stable@...r.kernel.org>
Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@...aro.org>
Signed-off-by: Sricharan Ramabadhran <quic_srichara@...cinc.com>
---
 [v5] Fixed subject, commit log
 [v4] Fix commit sub and added '<mani@...nel.org>' reviewed-by tag
 [v3] Added reviewed-by tag, fixed subject, commit text
 [v2] Fixed the 'fixes tag' correctly, subject, right macro usage 

 drivers/pci/controller/dwc/pcie-qcom.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
index 4ab30892f6ef..8418894b3de7 100644
--- a/drivers/pci/controller/dwc/pcie-qcom.c
+++ b/drivers/pci/controller/dwc/pcie-qcom.c
@@ -43,7 +43,6 @@
 #define PARF_PHY_REFCLK				0x4c
 #define PARF_CONFIG_BITS			0x50
 #define PARF_DBI_BASE_ADDR			0x168
-#define PARF_SLV_ADDR_SPACE_SIZE_2_3_3		0x16c /* Register offset specific to IP ver 2.3.3 */
 #define PARF_MHI_CLOCK_RESET_CTRL		0x174
 #define PARF_AXI_MSTR_WR_ADDR_HALT		0x178
 #define PARF_AXI_MSTR_WR_ADDR_HALT_V2		0x1a8
@@ -810,8 +809,7 @@ static int qcom_pcie_post_init_2_3_3(struct qcom_pcie *pcie)
 	u16 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
 	u32 val;
 
-	writel(SLV_ADDR_SPACE_SZ,
-		pcie->parf + PARF_SLV_ADDR_SPACE_SIZE_2_3_3);
+	writel(SLV_ADDR_SPACE_SZ, pcie->parf + PARF_SLV_ADDR_SPACE_SIZE);
 
 	val = readl(pcie->parf + PARF_PHY_CTRL);
 	val &= ~PHY_TEST_PWR_DOWN;
-- 
2.34.1