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FAILED: patch "[PATCH] PCI: imx6: Fix IMX6SX_GPR12_PCIE_TEST_POWERDOWN handling" failed to apply to 6.6-stable tree

PATCH New [email protected] 2 participants 2 messages Jul 13 – Jul 14

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Stable branch Arm i.MX and Layerscape PCI PCI native host bridge and endpoint drivers +1 more subsystems
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#0 lore raw

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-6.6.y
git checkout FETCH_HEAD
git cherry-pick -x aad953fb4eed0df5486cd54ccad80ac197678e01
# <resolve conflicts, build, test, etc.>
git commit -s
git send-email --to '<[email protected]>' --in-reply-to '2026071323-justify-shawl-172f@gregkh' --subject-prefix 'PATCH 6.6.y' 'HEAD^..'

Possible dependencies:

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From aad953fb4eed0df5486cd54ccad80ac197678e01 Mon Sep 17 00:00:00 2001
From: Richard Zhu <[email protected]>
Date: Thu, 19 Mar 2026 17:08:44 +0800
Subject: [PATCH] PCI: imx6: Fix IMX6SX_GPR12_PCIE_TEST_POWERDOWN handling

The IMX6SX_GPR12_PCIE_TEST_POWERDOWN bit does not control the PCIe reference clock on i.MX6SX. Instead, it is part of i.MX6SX PCIe core reset sequence.

Move the IMX6SX_GPR12_PCIE_TEST_POWERDOWN assertion/deassertion into the core reset functions to properly reflect its purpose. Remove the .enable_ref_clk() callback for i.MX6SX since it was incorrectly manipulating this bit.

Fixes e3c06cd063d6 ("PCI: imx6: Add initial imx6sx support")
Signed-off-by Richard Zhu <[email protected]>
Signed-off-by Manivannan Sadhasivam <[email protected]>
Signed-off-by Bjorn Helgaas <[email protected]>
Reviewed-by Frank Li <[email protected]>
Cc [email protected]
Link https://patch.msgid.link/[email protected] open here
drivers/pci/controller/dwc/pci-imx6.c +3 -9
index e35044cc5218..1034ac5c5f5c 100644
@@ -665,14 +665,6 @@ static int imx_pcie_attach_pd(struct device *dev)
 	return 0;
 }
 
-static int imx6sx_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
-{
-	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
-			   IMX6SX_GPR12_PCIE_TEST_POWERDOWN,
-			   enable ? 0 : IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
-	return 0;
-}
-
 static int imx6q_pcie_enable_ref_clk(struct imx_pcie *imx_pcie, bool enable)
 {
 	if (enable) {

@@ -786,6 +778,9 @@ static int imx6sx_pcie_core_reset(struct imx_pcie *imx_pcie, bool assert)
 	if (assert)
 		regmap_set_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
 				IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
+	else
+		regmap_clear_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				  IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
 
 	/* Force PCIe PHY reset */
 	regmap_update_bits(imx_pcie->iomuxc_gpr, IOMUXC_GPR5, IMX6SX_GPR5_PCIE_BTNRST_RESET,

@@ -1877,7 +1872,6 @@ static const struct imx_pcie_drvdata drvdata[] = {
 		.mode_off[0] = IOMUXC_GPR12,
 		.mode_mask[0] = IMX6Q_GPR12_DEVICE_TYPE,
 		.init_phy = imx6sx_pcie_init_phy,
-		.enable_ref_clk = imx6sx_pcie_enable_ref_clk,
 		.core_reset = imx6sx_pcie_core_reset,
 		.ops = &imx_pcie_host_ops,
 	},
maintainer
#1 lore raw

PATCH 1/1 PCI: imx6: Fix IMX6SX_GPR12_PCIE_TEST_POWERDOWN handling

From: Richard Zhu <[email protected]>

[ Upstream commit aad953fb4eed0df5486cd54ccad80ac197678e01 ]

The IMX6SX_GPR12_PCIE_TEST_POWERDOWN bit does not control the PCIe reference clock on i.MX6SX. Instead, it is part of i.MX6SX PCIe core reset sequence.

Move the IMX6SX_GPR12_PCIE_TEST_POWERDOWN assertion/deassertion into the core reset functions to properly reflect its purpose. Remove the .enable_ref_clk() callback for i.MX6SX since it was incorrectly manipulating this bit.

Fixes e3c06cd063d6 ("PCI: imx6: Add initial imx6sx support")
Signed-off-by Richard Zhu <[email protected]>
Signed-off-by Manivannan Sadhasivam <[email protected]>
Signed-off-by Bjorn Helgaas <[email protected]>
Reviewed-by Frank Li <[email protected]>
Cc [email protected]
Link https://patch.msgid.link/[email protected] open here
Signed-off-by Sasha Levin <[email protected]>
---
 drivers/pci/controller/dwc/pci-imx6.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
drivers/pci/controller/dwc/pci-imx6.c +2 -2
index 23b8dda70cb2f0..c438cf888ad575 100644
@@ -560,8 +560,6 @@ static int imx6_pcie_enable_ref_clk(struct imx6_pcie *imx6_pcie)
 
 	switch (imx6_pcie->drvdata->variant) {
 	case IMX6SX:
-		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
-				   IMX6SX_GPR12_PCIE_TEST_POWERDOWN, 0);
 		break;
 	case IMX6QP:
 	case IMX6Q:

@@ -733,6 +731,8 @@ static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
 		imx7d_pcie_wait_for_phy_pll_lock(imx6_pcie);
 		break;
 	case IMX6SX:
+		regmap_clear_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
+				  IMX6SX_GPR12_PCIE_TEST_POWERDOWN);
 		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR5,
 				   IMX6SX_GPR5_PCIE_BTNRST_RESET, 0);
 		break;
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2.53.0