* [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 @ 2017-10-17 0:11 Trent Piepho 2017-10-17 0:11 ` [PATCH 2/2] PCI: imx6: Check for link training status in link up check Trent Piepho 2017-10-17 8:35 ` [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Lucas Stach 0 siblings, 2 replies; 5+ messages in thread From: Trent Piepho @ 2017-10-17 0:11 UTC (permalink / raw) To: linux-arm-kernel, linux-pci Cc: Andrey Smirnov, Lucas Stach, Richard Zhu, Trent Piepho The IMX6 PCI-e host driver also supports the IMX7d. However, the Kconfig dependencies of the driver prevented it from being enabled unless the kernel was built with both IMX6 and IMX7 support. It works fine to build with only IMX7 support enabled. Cc: Andrey Smirnov <andrew.smirnov@gmail.com> Cc: Richard Zhu <hongxing.zhu@nxp.com> CC: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Trent Piepho <tpiepho@impinj.com> --- drivers/pci/dwc/Kconfig | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/dwc/Kconfig b/drivers/pci/dwc/Kconfig index 22ec82fcdea2..85cf392921a9 100644 --- a/drivers/pci/dwc/Kconfig +++ b/drivers/pci/dwc/Kconfig @@ -71,9 +71,9 @@ config PCI_EXYNOS select PCIE_DW_HOST config PCI_IMX6 - bool "Freescale i.MX6 PCIe controller" + bool "Freescale i.MX6/7 PCIe controller" depends on PCI - depends on SOC_IMX6Q + depends on SOC_IMX6Q || SOC_IMX7D depends on PCI_MSI_IRQ_DOMAIN select PCIEPORTBUS select PCIE_DW_HOST -- 2.13.6 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 5+ messages in thread
* [PATCH 2/2] PCI: imx6: Check for link training status in link up check 2017-10-17 0:11 [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Trent Piepho @ 2017-10-17 0:11 ` Trent Piepho 2017-10-17 8:44 ` Lucas Stach 2017-10-17 8:35 ` [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Lucas Stach 1 sibling, 1 reply; 5+ messages in thread From: Trent Piepho @ 2017-10-17 0:11 UTC (permalink / raw) To: linux-arm-kernel, linux-pci Cc: Bjorn Helgaas, Joao Pinto, Lucas Stach, Trent Piepho This fixes a regression introduced in merge 562df5c8521e. Prior to this the link up check done by imx6_pcie_wait_for_link() consisted of a polling loop on imx6_pcie_link_up() (via the former calling dw_pcie_link_up() which called the latter as callback), and imx6_pcie_link_up() polled the link status register checking for link up *and link not still training*. This was a polling loop inside another polling loop. And the outermost loop was duplicated with minor variations in a number of other dwc based host drivers. This was addressed in two commits. Commit 4d107d3b5a68 ("PCI: imx6: Move link up check into imx6_pcie_wait_for_link()"), changed imx6_pcie_wait_for_link() to poll the link status register directly, checking for link up and not training, and made imx6_pcie_link_up() only check the link up bit (once, not a polling loop). While commit commit 886bc5ceb5cc ("PCI: designware: Add generic dw_pcie_wait_for_link()"), replaced the loop in imx6_pcie_wait_for_link() with a call to a new dwc core function, which polled imx6_pcie_link_up(), which still checked both link up and not training in a loop. When these two commits were merged, the version of imx6_pcie_wait_for_link() from '886 was kept, which eliminated the link training check placed there by '4d1. But the version of imx6_pcie_link_up() from '4d1 was kept, which eliminated the link training check that had been there and was moved to imx6_pcie_wait_for_link(). There result is no link training check. Then commit dac29e6c5460 ("PCI: designware: Add default link up check if sub-driver doesn't override") added a link training check to the default version of dw_pcie_link_up(), but since imx6 uses imx6_pcie_link_up() it does not use the default version with this fix. This commit eliminates imx6_pcie_link_up() so that the default dw_pcie_link_up() is used. The default has the correct code and is what the imx6 driver used to do. Fixes: 562df5c8521e1371f3cbd0b7b868034da376d714 Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Joao Pinto <Joao.Pinto@synopsys.com> Cc: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Trent Piepho <tpiepho@impinj.com> --- drivers/pci/dwc/pci-imx6.c | 10 +--------- 1 file changed, 1 insertion(+), 9 deletions(-) diff --git a/drivers/pci/dwc/pci-imx6.c b/drivers/pci/dwc/pci-imx6.c index b73483534a5b..1f1069b70e45 100644 --- a/drivers/pci/dwc/pci-imx6.c +++ b/drivers/pci/dwc/pci-imx6.c @@ -83,8 +83,6 @@ struct imx6_pcie { #define PCIE_PL_PFLR_FORCE_LINK (1 << 15) #define PCIE_PHY_DEBUG_R0 (PL_OFFSET + 0x28) #define PCIE_PHY_DEBUG_R1 (PL_OFFSET + 0x2c) -#define PCIE_PHY_DEBUG_R1_XMLH_LINK_IN_TRAINING (1 << 29) -#define PCIE_PHY_DEBUG_R1_XMLH_LINK_UP (1 << 4) #define PCIE_PHY_CTRL (PL_OFFSET + 0x114) #define PCIE_PHY_CTRL_DATA_LOC 0 @@ -653,12 +651,6 @@ static int imx6_pcie_host_init(struct pcie_port *pp) return 0; } -static int imx6_pcie_link_up(struct dw_pcie *pci) -{ - return dw_pcie_readl_dbi(pci, PCIE_PHY_DEBUG_R1) & - PCIE_PHY_DEBUG_R1_XMLH_LINK_UP; -} - static const struct dw_pcie_host_ops imx6_pcie_host_ops = { .host_init = imx6_pcie_host_init, }; @@ -701,7 +693,7 @@ static int imx6_add_pcie_port(struct imx6_pcie *imx6_pcie, } static const struct dw_pcie_ops dw_pcie_ops = { - .link_up = imx6_pcie_link_up, + /* No special ops needed, but pcie-designware still expects this struct */ }; static int imx6_pcie_probe(struct platform_device *pdev) -- 2.13.6 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 2/2] PCI: imx6: Check for link training status in link up check 2017-10-17 0:11 ` [PATCH 2/2] PCI: imx6: Check for link training status in link up check Trent Piepho @ 2017-10-17 8:44 ` Lucas Stach 2017-10-17 17:37 ` Trent Piepho 0 siblings, 1 reply; 5+ messages in thread From: Lucas Stach @ 2017-10-17 8:44 UTC (permalink / raw) To: Trent Piepho, linux-arm-kernel, linux-pci; +Cc: Bjorn Helgaas, Joao Pinto QW0gTW9udGFnLCBkZW4gMTYuMTAuMjAxNywgMTc6MTEgLTA3MDAgc2NocmllYiBUcmVudCBQaWVw aG86Cj4gVGhpcyBmaXhlcyBhIHJlZ3Jlc3Npb24gaW50cm9kdWNlZCBpbiBtZXJnZSA1NjJkZjVj ODUyMWUuCj4gCj4gUHJpb3IgdG8gdGhpcyB0aGUgbGluayB1cCBjaGVjayBkb25lIGJ5IGlteDZf cGNpZV93YWl0X2Zvcl9saW5rKCkKPiBjb25zaXN0ZWQgb2YgYSBwb2xsaW5nIGxvb3Agb24gaW14 Nl9wY2llX2xpbmtfdXAoKSAodmlhIHRoZSBmb3JtZXIKPiBjYWxsaW5nIGR3X3BjaWVfbGlua191 cCgpIHdoaWNoIGNhbGxlZCB0aGUgbGF0dGVyIGFzIGNhbGxiYWNrKSwgYW5kCj4gaW14Nl9wY2ll X2xpbmtfdXAoKSBwb2xsZWQgdGhlIGxpbmsgc3RhdHVzIHJlZ2lzdGVyIGNoZWNraW5nIGZvciBs 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5+ messages in thread
* Re: [PATCH 2/2] PCI: imx6: Check for link training status in link up check 2017-10-17 8:44 ` Lucas Stach @ 2017-10-17 17:37 ` Trent Piepho 0 siblings, 0 replies; 5+ messages in thread From: Trent Piepho @ 2017-10-17 17:37 UTC (permalink / raw) To: l.stach@pengutronix.de, linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org Cc: bhelgaas@google.com, Joao.Pinto@synopsys.com On Tue, 2017-10-17 at 10:44 +0200, Lucas Stach wrote: > Am Montag, den 16.10.2017, 17:11 -0700 schrieb Trent Piepho: > > > > > > There result is no link training check. > > > > Then commit dac29e6c5460 ("PCI: designware: Add default link up check if > > sub-driver doesn't override") > > I think you meant 01c076732e82 (PCI: designware: Check LTSSM training > bit before deciding link is up) here. > > > added a link training check to the default > > version of dw_pcie_link_up(), but since imx6 uses imx6_pcie_link_up() it > > does not use the default version with this fix. It was really the combination of both commits. 'dac added the common link up check, which imx6 didn't use, and then '01c added the training check to it. It appears I've attributed both changes to 'dac in my message and forgot '01c. I'll fix. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 2017-10-17 0:11 [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Trent Piepho 2017-10-17 0:11 ` [PATCH 2/2] PCI: imx6: Check for link training status in link up check Trent Piepho @ 2017-10-17 8:35 ` Lucas Stach 1 sibling, 0 replies; 5+ messages in thread From: Lucas Stach @ 2017-10-17 8:35 UTC (permalink / raw) To: Trent Piepho, linux-arm-kernel, linux-pci; +Cc: Andrey Smirnov, Richard Zhu QW0gTW9udGFnLCBkZW4gMTYuMTAuMjAxNywgMTc6MTEgLTA3MDAgc2NocmllYiBUcmVudCBQaWVw aG86Cj4gVGhlIElNWDYgUENJLWUgaG9zdCBkcml2ZXIgYWxzbyBzdXBwb3J0cyB0aGUgSU1YN2Qu wqDCoEhvd2V2ZXIsIHRoZQo+IEtjb25maWcgZGVwZW5kZW5jaWVzIG9mIHRoZSBkcml2ZXIgcHJl dmVudGVkIGl0IGZyb20gYmVpbmcgZW5hYmxlZAo+IHVubGVzcyB0aGUga2VybmVsIHdhcyBidWls dCB3aXRoIGJvdGggSU1YNiBhbmQgSU1YNyBzdXBwb3J0LsKgwqBJdAo+IHdvcmtzCj4gZmluZSB0 byBidWlsZCB3aXRoIG9ubHkgSU1YNyBzdXBwb3J0IGVuYWJsZWQuCj4gCj4gQ2M6IEFuZHJleSBT bWlybm92IDxhbmRyZXcuc21pcm5vdkBnbWFpbC5jb20+Cj4gQ2M6IFJpY2hhcmQgWmh1IDxob25n eGluZy56aHVAbnhwLmNvbT4KPiBDQzogTHVjYXMgU3RhY2ggPGwuc3RhY2hAcGVuZ3V0cm9uaXgu ZGU+Cj4gU2lnbmVkLW9mZi1ieTogVHJlbnQgUGllcGhvIDx0cGllcGhvQGltcGluai5jb20+CgpS ZXZpZXdlZC1ieTogTHVjYXMgU3RhY2ggPGwuc3RhY2hAcGVuZ3V0cm9uaXguZGU+Cgo+IC0tLQo+ IMKgZHJpdmVycy9wY2kvZHdjL0tjb25maWcgfCA0ICsrLS0KPiDCoDEgZmlsZSBjaGFuZ2VkLCAy IGluc2VydGlvbnMoKyksIDIgZGVsZXRpb25zKC0pCj4gCj4gZGlmZiAtLWdpdCBhL2RyaXZlcnMv cGNpL2R3Yy9LY29uZmlnIGIvZHJpdmVycy9wY2kvZHdjL0tjb25maWcKPiBpbmRleCAyMmVjODJm Y2RlYTIuLjg1Y2YzOTI5MjFhOSAxMDA2NDQKPiAtLS0gYS9kcml2ZXJzL3BjaS9kd2MvS2NvbmZp Zwo+ICsrKyBiL2RyaXZlcnMvcGNpL2R3Yy9LY29uZmlnCj4gQEAgLTcxLDkgKzcxLDkgQEAgY29u ZmlnIFBDSV9FWFlOT1MKPiDCoAlzZWxlY3QgUENJRV9EV19IT1NUCj4gwqAKPiDCoGNvbmZpZyBQ Q0lfSU1YNgo+IC0JYm9vbCAiRnJlZXNjYWxlIGkuTVg2IFBDSWUgY29udHJvbGxlciIKPiArCWJv b2wgIkZyZWVzY2FsZSBpLk1YNi83IFBDSWUgY29udHJvbGxlciIKPiDCoAlkZXBlbmRzIG9uIFBD SQo+IC0JZGVwZW5kcyBvbiBTT0NfSU1YNlEKPiArCWRlcGVuZHMgb24gU09DX0lNWDZRIHx8IFNP Q19JTVg3RAo+IMKgCWRlcGVuZHMgb24gUENJX01TSV9JUlFfRE9NQUlOCj4gwqAJc2VsZWN0IFBD SUVQT1JUQlVTCj4gwqAJc2VsZWN0IFBDSUVfRFdfSE9TVAoKX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fX19fX18KbGludXgtYXJtLWtlcm5lbCBtYWlsaW5nIGxpc3QK bGludXgtYXJtLWtlcm5lbEBsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRl YWQub3JnL21haWxtYW4vbGlzdGluZm8vbGludXgtYXJtLWtlcm5lbAo= ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2017-10-17 17:37 UTC | newest] Thread overview: 5+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2017-10-17 0:11 [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Trent Piepho 2017-10-17 0:11 ` [PATCH 2/2] PCI: imx6: Check for link training status in link up check Trent Piepho 2017-10-17 8:44 ` Lucas Stach 2017-10-17 17:37 ` Trent Piepho 2017-10-17 8:35 ` [PATCH 1/2] PCI: dwc: Adjust Kconfig to allow IMX6 PCIe host on IMX7 Lucas Stach
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