linux-kernel - Re: [PATCH v2 2/5] phy: qcom-qmp: Add USB3 5NM QMP UNI registers

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Message-ID: <Yp/VCg3UznbLKLuk@ripper>
Date:   Tue, 7 Jun 2022 15:45:30 -0700
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Manu Gautam <mgautam@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/5] phy: qcom-qmp: Add USB3 5NM QMP UNI registers

On Tue 07 Jun 14:58 PDT 2022, Dmitry Baryshkov wrote:
> On 08/06/2022 00:35, Bjorn Andersson wrote:
[..]
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_BIN_VCOCAL_CMP_CODE2_MODE0	0x1b0
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_BIN_VCOCAL_CMP_CODE1_MODE1	0x1b4
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_BIN_VCOCAL_CMP_CODE2_MODE1	0x1b8
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_BIN_VCOCAL_HSCLK_SEL		0x1bc
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_RESERVED_1			0x1c0
> > +#define USB3_V5_5NM_UNI_QSERDES_COM_MODE_OPERATION_STATUS		0x1c4
> 
> These defines look completely compatible with the existing ones in the
> QSERDES_V5_COM_ namespace. Please use them instead.
> 

Can you please confirm that all these constants are exactly the same as
the existing V5 entries?

[..]
> > +/* Module: USB3_UNI_PCS_USB3_PCIE_USB3_UNI_PCS_USB3 */
> > +#define USB3_V5_5NM_UNI_PCS_USB3_POWER_STATE_CONFIG1		0x00
> > +#define USB3_V5_5NM_UNI_PCS_USB3_AUTONOMOUS_MODE_STATUS		0x04
> > +#define USB3_V5_5NM_UNI_PCS_USB3_AUTONOMOUS_MODE_CTRL		0x08
> > +#define USB3_V5_5NM_UNI_PCS_USB3_AUTONOMOUS_MODE_CTRL2		0x0c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_RXTERM_IRQ_SOURCE_STATUS	0x10
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_RXTERM_IRQ_CLEAR		0x14
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_DET_HIGH_COUNT_VAL		0x18
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_TX_ECSTART			0x1c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_PER_TIMER_VAL		0x20
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_TX_END_CNT_U3_START		0x24
> > +#define USB3_V5_5NM_UNI_PCS_USB3_LFPS_CONFIG1			0x28
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXEQTRAINING_LOCK_TIME		0x2c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXEQTRAINING_WAIT_TIME		0x30
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXEQTRAINING_CTLE_TIME		0x34
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXEQTRAINING_WAIT_TIME_S2		0x38
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXEQTRAINING_DFE_TIME_S2		0x3c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RCVR_DTCT_DLY_U3_L		0x40
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RCVR_DTCT_DLY_U3_H		0x44
> > +#define USB3_V5_5NM_UNI_PCS_USB3_ARCVR_DTCT_EN_PERIOD		0x48
> > +#define USB3_V5_5NM_UNI_PCS_USB3_ARCVR_DTCT_CM_DLY			0x4c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_TXONESZEROS_RUN_LENGTH		0x50
> > +#define USB3_V5_5NM_UNI_PCS_USB3_ALFPS_DEGLITCH_VAL		0x54
> > +#define USB3_V5_5NM_UNI_PCS_USB3_SIGDET_STARTUP_TIMER_VAL		0x58
> > +#define USB3_V5_5NM_UNI_PCS_USB3_TEST_CONTROL			0x5c
> > +#define USB3_V5_5NM_UNI_PCS_USB3_RXTERMINATION_DLY_SEL		0x60
> 
> These look like QPHY_V5_PCS_USB3, but without additional 0x300 offset. I'd
> suggest modifying qcom-qmp-phy-usb.c to allocate another register space for
> pcs_usb and updating QPHY_V4_PCS_USB3_foo / QPHY_V5_PCS_USB3_foo defines to
> remove this offset.
> 
> Afterwards most if not all constants from this header can be merged into
> phy-qcom-qmp.h I do not think that it makes sense to split this header at
> this moment. The QSERDES_COM/_TX/_RX/_PCS defines are common to all PHY
> types.
> 

You might be right, but I spent considerable time debugging the combo
phy (which is version 5.0.0) and in the end it turned out that it's not
the same offsets.

I really would prefer that we stop haphazardly try to fit things into
the phy-qcom-qmp.h with version numbers that we essentially make up
base, when Qualcomm dumps the register layout for each generation in
their downstream kernel.

Regards,
Bjorn