linux-kernel - [PATCH v14 05/11] PCI: kirin: give more time for PERST# reset to finish

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Date:   Tue, 19 Oct 2021 07:06:42 +0100
From:   Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
To:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        "Songxiaowei" <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: [PATCH v14 05/11] PCI: kirin: give more time for PERST# reset to finish

Before code refactor, the PERST# signals were sent at the
end of the power_on logic. Then, the PCI core would probe for
the buses and add them.

The new logic changed it to send PERST# signals during
add_bus operation. That altered the timings.

Also, HiKey 970 require a little more waiting time for
the PCI bridge - which is outside the SoC - to finish
the PERST# reset, and then initialize the eye diagram.

So, increase the waiting time for the PERST# signals to
what's required for it to also work with HiKey 970.

Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
---

See [PATCH v14 00/11] at: https://lore.kernel.org/all/cover.1634622716.git.mchehab+huawei@kernel.org/

 drivers/pci/controller/dwc/pcie-kirin.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
index de375795a3b8..bc329673632a 100644
--- a/drivers/pci/controller/dwc/pcie-kirin.c
+++ b/drivers/pci/controller/dwc/pcie-kirin.c
@@ -113,7 +113,7 @@ struct kirin_pcie {
 #define CRGCTRL_PCIE_ASSERT_BIT		0x8c000000
 
 /* Time for delay */
-#define REF_2_PERST_MIN		20000
+#define REF_2_PERST_MIN		21000
 #define REF_2_PERST_MAX		25000
 #define PERST_2_ACCESS_MIN	10000
 #define PERST_2_ACCESS_MAX	12000
-- 
2.31.1