From: Serge Semin <Sergey.Semin@baikalelectronics.ru>
To: "Rob Herring" <robh@kernel.org>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Lorenzo Pieralisi" <lorenzo.pieralisi@arm.com>,
"Jingoo Han" <jingoohan1@gmail.com>,
"Gustavo Pimentel" <gustavo.pimentel@synopsys.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>
Cc: Serge Semin <Sergey.Semin@baikalelectronics.ru>,
Serge Semin <fancer.lancer@gmail.com>,
Alexey Malahov <Alexey.Malahov@baikalelectronics.ru>,
Pavel Parkhomenko <Pavel.Parkhomenko@baikalelectronics.ru>,
Frank Li <Frank.Li@nxp.com>,
Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>,
<linux-pci@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH RESEND v5 09/18] PCI: dwc: Discard IP-core version checking on unrolled iATU detection
Date: Fri, 24 Jun 2022 17:34:19 +0300 [thread overview]
Message-ID: <20220624143428.8334-10-Sergey.Semin@baikalelectronics.ru> (raw)
In-Reply-To: <20220624143428.8334-1-Sergey.Semin@baikalelectronics.ru>
It's pretty much pointless. Even though unrolled version of the internal
ATU has been indeed available since DWC PCIe v4.80a IP-core, there is no
guarantee it was enabled during the IP-core configuration (Synopsys
suggests to contact the Solvnet support for guidance of how to do that for
the newer IP-cores). So the only reliable way to find out the unrolled
iATU feature availability is indeed to check the iATU viewport register
content. In accordance with the reference manual [1] if the register
doesn't exist (unrolled iATU is enabled) it's content is fixed with
0xff-s, otherwise it will contain some zeros. So we can freely drop the
IP-core version checking in this matter then and use the
dw_pcie_iatu_unroll_enabled() method only to detect whether iATU/eDMA
space is unrolled.
[1] DesignWare Cores, PCI Express Controller, Register Desciptions,
v.4.90a, December 2016, p.855
Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Rob Herring <robh@kernel.org>
---
drivers/pci/controller/dwc/pcie-designware.c | 11 +++++------
1 file changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware.c b/drivers/pci/controller/dwc/pcie-designware.c
index ac966ed28c5b..e5c30695f664 100644
--- a/drivers/pci/controller/dwc/pcie-designware.c
+++ b/drivers/pci/controller/dwc/pcie-designware.c
@@ -600,15 +600,15 @@ static void dw_pcie_link_set_max_speed(struct dw_pcie *pci, u32 link_gen)
}
-static u8 dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
+static bool dw_pcie_iatu_unroll_enabled(struct dw_pcie *pci)
{
u32 val;
val = dw_pcie_readl_dbi(pci, PCIE_ATU_VIEWPORT);
if (val == 0xffffffff)
- return 1;
+ return true;
- return 0;
+ return false;
}
static void dw_pcie_iatu_detect_regions_unroll(struct dw_pcie *pci)
@@ -680,9 +680,8 @@ void dw_pcie_iatu_detect(struct dw_pcie *pci)
struct device *dev = pci->dev;
struct platform_device *pdev = to_platform_device(dev);
- if (pci->version >= 0x480A || (!pci->version &&
- dw_pcie_iatu_unroll_enabled(pci))) {
- pci->iatu_unroll_enabled = true;
+ pci->iatu_unroll_enabled = dw_pcie_iatu_unroll_enabled(pci);
+ if (pci->iatu_unroll_enabled) {
if (!pci->atu_base) {
struct resource *res =
platform_get_resource_byname(pdev, IORESOURCE_MEM, "atu");
--
2.35.1
next prev parent reply other threads:[~2022-06-24 14:35 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-24 14:34 [PATCH RESEND v5 00/18] PCI: dwc: Various fixes and cleanups Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 01/18] PCI: dwc: Stop link in the host init error and de-initialization Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 02/18] PCI: dwc: Add unroll iATU space support to the regions disable method Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 03/18] PCI: dwc: Disable outbound windows for controllers with iATU Serge Semin
2022-06-27 22:40 ` Bjorn Helgaas
2022-06-28 11:42 ` Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 04/18] PCI: dwc: Set INCREASE_REGION_SIZE flag based on limit address Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 05/18] PCI: dwc: Deallocate EPC memory on EP init error Serge Semin
2022-06-28 6:35 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 06/18] PCI: dwc: Enable CDM-check independently from the num_lanes value Serge Semin
2022-06-28 6:37 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 07/18] PCI: dwc: Add braces to the multi-line if-else statements Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 08/18] PCI: dwc: Add trailing new-line literals to the log messages Serge Semin
2022-06-24 14:34 ` Serge Semin [this message]
2022-06-24 14:34 ` [PATCH RESEND v5 10/18] PCI: dwc: Convert Link-up status method to using dw_pcie_readl_dbi() Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 11/18] PCI: dwc: Organize local variables usage Serge Semin
2022-06-28 6:38 ` Manivannan Sadhasivam
2022-06-28 23:33 ` Bjorn Helgaas
2022-06-29 2:03 ` Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 12/18] PCI: dwc: Re-use local pointer to the resource data Serge Semin
2022-06-28 6:39 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 13/18] PCI: dwc: Add start_link/stop_link inliners Serge Semin
2022-06-28 6:43 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 14/18] PCI: dwc: Move io_cfg_atu_shared to the Root Port descriptor Serge Semin
2022-06-28 6:44 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 15/18] PCI: dwc: Add dw_ prefix to the pcie_port structure name Serge Semin
2022-06-27 11:47 ` Jesper Nilsson
2022-06-27 12:16 ` Neil Armstrong
2022-06-28 6:46 ` Manivannan Sadhasivam
2022-06-24 14:34 ` [PATCH RESEND v5 16/18] PCI: dwc-plat: Simplify the probe method return value handling Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 17/18] PCI: dwc-plat: Discard unused regmap pointer Serge Semin
2022-06-24 14:34 ` [PATCH RESEND v5 18/18] PCI: dwc-plat: Drop dw_plat_pcie_of_match forward declaration Serge Semin
2022-06-28 6:58 ` [PATCH RESEND v5 00/18] PCI: dwc: Various fixes and cleanups Manivannan Sadhasivam
2022-06-28 11:57 ` Serge Semin
2022-06-28 23:35 ` Bjorn Helgaas
2022-06-29 1:38 ` Serge Semin
2022-07-11 18:40 ` Serge Semin
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20220624143428.8334-10-Sergey.Semin@baikalelectronics.ru \
--to=sergey.semin@baikalelectronics.ru \
--cc=Alexey.Malahov@baikalelectronics.ru \
--cc=Frank.Li@nxp.com \
--cc=Pavel.Parkhomenko@baikalelectronics.ru \
--cc=bhelgaas@google.com \
--cc=fancer.lancer@gmail.com \
--cc=gustavo.pimentel@synopsys.com \
--cc=jingoohan1@gmail.com \
--cc=kw@linux.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-pci@vger.kernel.org \
--cc=lorenzo.pieralisi@arm.com \
--cc=lpieralisi@kernel.org \
--cc=manivannan.sadhasivam@linaro.org \
--cc=robh@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).