linux-kernel - Re: [PATCH] phy: qcom-qmp-pcie: Fix X1E80100 PCIe Gen4 PHY initialisation

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Message-ID: <ZqtkgPf+JOP+im1s@linaro.org>
Date: Thu, 1 Aug 2024 13:33:36 +0300
From: Abel Vesa <abel.vesa@...aro.org>
To: Johan Hovold <johan@...nel.org>
Cc: Vinod Koul <vkoul@...nel.org>,
	Kishon Vijay Abraham I <kishon@...nel.org>,
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
	Johan Hovold <johan+linaro@...nel.org>,
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] phy: qcom-qmp-pcie: Fix X1E80100 PCIe Gen4 PHY
 initialisation

On 24-07-26 16:29:04, Johan Hovold wrote:
> On Fri, Jul 26, 2024 at 10:16:56AM +0300, Abel Vesa wrote:
> > Update the PCIe Gen4 PHY init sequence with the latest based on internal
> > Qualcomm documentation.
> 
> Any hints about what these updates imply?

Usually, there is an updated variant of the same document.
I've been told that this values are fine-tuned over time.
I'm assuming these updates should help with link stability, but it's
just a guess.

> 
> > Fixes: 606060ce8fd0 ("phy: qcom-qmp-pcie: Add support for X1E80100 g3x2 and g4x2 PCIE")
> > Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
> > ---
> >  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 23 ++++++++++++++++-------
> >  1 file changed, 16 insertions(+), 7 deletions(-)
> > 
> > diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > index 5b36cc7ac78b..8b624afbf014 100644
> > --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> > +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> 
> >  static const struct qmp_phy_init_tbl x1e80100_qmp_gen4x2_pcie_tx_tbl[] = {
> > @@ -1286,12 +1287,15 @@ static const struct qmp_phy_init_tbl x1e80100_qmp_gen4x2_pcie_rx_tbl[] = {
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_1, 0x01),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_2, 0x01),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_3, 0x45),
> > -	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0b),
> > +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0A, 1),
> > +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_VGA_CAL_MAN_VAL, 0x0B, 2),
> 
> Please use lower-case hex consistently.

Sure. Will fix in v2.

> 
> > +	QMP_PHY_INIT_CFG(QSERDES_V6_20_VGA_CAL_CNTRL1, 0x00),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_GM_CAL, 0x0d),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_EQU_ADAPTOR_CNTRL4, 0x0b),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_SIGDET_ENABLES, 0x1c),
> >  	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_PHPRE_CTRL, 0x20),
> > -	QMP_PHY_INIT_CFG(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x38),
> > +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x3A, 1),
> > +	QMP_PHY_INIT_CFG_LANE(QSERDES_V6_20_RX_DFE_CTLE_POST_CAL_OFFSET, 0x38, 2),
> 
> Ditto.
> 
> Johan