linux-kernel - Re: [PATCH] phy: qcom-qmp: Correct READY

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Date:   Fri, 19 Jul 2019 17:50:14 +0200
From:   Marc Gonzalez <marc.w.gonzalez@...e.fr>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Kishon Vijay Abraham I <kishon@...com>
Cc:     MSM <linux-arm-msm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Evan Green <evgreen@...omium.org>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Niklas Cassel <niklas.cassel@...aro.org>,
        Stanimir Varbanov <svarbanov@...sol.com>
Subject: Re: [PATCH] phy: qcom-qmp: Correct READY_STATUS poll break condition

On 13/06/2019 11:10, Marc Gonzalez wrote:

> Here are my observations for a 8998 board:
> 
> 1) If I apply only the readl_poll_timeout() fix (not the mask_pcs_ready fixup)
> qcom_pcie_probe() fails with a timeout in phy_init.
> => this is in line with your regression analysis.
> 
> 2) Your patch also fixes a long-standing bug in UFS init whereby sending
> lots of information to the console during phy init would lead to an
> incorrectly diagnosed time-out.
> 
> Good stuff!
> 
> Reviewed-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>
> Tested-by: Marc Gonzalez <marc.w.gonzalez@...e.fr>

It looks like this patch fixed UFS, but broke PCIe and USB3 ^_^

qcom-qmp-phy 1c06000.phy: Registered Qcom-QMP phy
qcom-qmp-phy c010000.phy: Registered Qcom-QMP phy
qcom-qmp-phy 1da7000.phy: Registered Qcom-QMP phy

qcom-qmp-phy 1c06000.phy: BEFORE=000000a6 AFTER=000000a6
qcom-qmp-phy 1c06000.phy: phy initialization timed-out
phy phy-1c06000.phy.0: phy init failed --> -110
qcom-pcie: probe of 1c00000.pci failed with error -110

qcom-qmp-phy 1da7000.phy: BEFORE=00000040 AFTER=0000000d

qcom-qmp-phy c010000.phy: BEFORE=69696969 AFTER=b7b7b7b7
qcom-qmp-phy c010000.phy: phy initialization timed-out
phy phy-c010000.phy.1: phy init failed --> -110
dwc3 a800000.dwc3: failed to initialize core: -110
dwc3: probe of a800000.dwc3 failed with error -110


Downstream code for PCIe is:

static bool pcie_phy_is_ready(struct msm_pcie_dev_t *dev)
{
	if (dev->phy_ver >= 0x20) {
		if (readl_relaxed(dev->phy + PCIE_N_PCS_STATUS(dev->rc_idx, dev->common_phy)) &	BIT(6))
			return false;
		else
			return true;
	}

	if (!(readl_relaxed(dev->phy + PCIE_COM_PCS_READY_STATUS) & 0x1))
		return false;
	else
		return true;
}

AFAICT:
PCIe and USB3 QMP PHYs are ready when PHYSTATUS=BIT(6) goes to 0.
But UFS is ready when PCS_READY=BIT(0) goes to 1.


Can someone verify that USB3 is broken on 845 with 885bd765963b?

Regards.