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Wed, 20 Jul 2022 23:12:08 -0700 (PDT) Received: from genechen-System-Product-Name.richtek.com ([2402:7500:46a:8b75:f825:a44d:6d0d:6d6e]) by smtp.gmail.com with ESMTPSA id 13-20020a62170d000000b0052ba782f4cbsm744998pfx.7.2022.07.20.23.12.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 20 Jul 2022 23:12:07 -0700 (PDT) From: Gene Chen To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, gene_chen@richtek.com, cy_huang@richtek.com Subject: [PATCH v2 6/6] usb: typec: tcpci_rt1711h: Fix CC PHY noise filter of voltage level Date: Thu, 21 Jul 2022 14:11:44 +0800 Message-Id: <20220721061144.35139-7-gene.chen.richtek@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220721061144.35139-1-gene.chen.richtek@gmail.com> References: <20220721061144.35139-1-gene.chen.richtek@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM, RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Gene Chen Fix CC PHY noise filter of voltage level according to current cc voltage level Signed-off-by: Gene Chen --- drivers/usb/typec/tcpm/tcpci_rt1711h.c | 83 +++++++++++++++++++++++++- 1 file changed, 81 insertions(+), 2 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpci_rt1711h.c b/drivers/usb/typec/tcpm/tcpci_rt1711h.c index 3316dfaeee0d..f0c46bf7f00b 100644 --- a/drivers/usb/typec/tcpm/tcpci_rt1711h.c +++ b/drivers/usb/typec/tcpm/tcpci_rt1711h.c @@ -22,8 +22,11 @@ #define RT1711H_PHYCTRL1 0x80 #define RT1711H_PHYCTRL2 0x81 -#define RT1711H_RTCTRL8 0x9B +#define RT1711H_RTCTRL4 0x93 +/* rx threshold of rd/rp: 1b0 for level 0.4V/0.7V, 1b1 for 0.35V/0.75V */ +#define RT1711H_BMCIO_RXDZSEL BIT(0) +#define RT1711H_RTCTRL8 0x9B /* Autoidle timeout = (tout * 2 + 1) * 6.4ms */ #define RT1711H_RTCTRL8_SET(ck300, ship_off, auto_idle, tout) \ (((ck300) << 7) | ((ship_off) << 5) | \ @@ -32,7 +35,6 @@ #define RT1711H_ENEXTMSG_MASK BIT(4) #define RT1711H_RTCTRL11 0x9E - /* I2C timeout = (tout + 1) * 12.5ms */ #define RT1711H_RTCTRL11_SET(en, tout) \ (((en) << 7) | ((tout) & 0x0F)) @@ -42,6 +44,10 @@ #define RT1711H_RTCTRL15 0xA2 #define RT1711H_RTCTRL16 0xA3 +#define RT1711H_RTCTRL18 0xAF +/* 1b0 as fixed rx threshold of rd/rp 0.55V, 1b1 depends on RTCRTL4[0] */ +#define BMCIO_RXDZEN_MASK BIT(0) + struct rt1711h_chip { struct tcpci_data data; struct tcpci *tcpci; @@ -162,6 +168,77 @@ static int rt1711h_set_vconn(struct tcpci *tcpci, struct tcpci_data *tdata, RT1711H_AUTOIDLEEN_MASK, enable ? 0 : 0xFF); } +#define tcpc_presenting_rd(reg, cc) \ + (!(TCPC_ROLE_CTRL_DRP & (reg)) && \ + (((reg) & (TCPC_ROLE_CTRL_## cc ##_MASK << TCPC_ROLE_CTRL_## cc ##_SHIFT)) == \ + (TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_## cc ##_SHIFT))) + +static enum typec_cc_status tcpci_to_typec_cc(unsigned int cc, bool sink) +{ + switch (cc) { + case 0x1: + return sink ? TYPEC_CC_RP_DEF : TYPEC_CC_RA; + case 0x2: + return sink ? TYPEC_CC_RP_1_5 : TYPEC_CC_RD; + case 0x3: + if (sink) + return TYPEC_CC_RP_3_0; + fallthrough; + case 0x0: + default: + return TYPEC_CC_OPEN; + } +} + +/* + * Selects the CC PHY noise filter voltage level according to the current + * CC voltage level. + * + * @param cc_level The CC voltage level for the port's current role + * @return 0 if writes succeed; failure code otherwise + */ +static inline int rt1711h_init_cc_params(struct rt1711h_chip *chip, u8 status) +{ + int ret, cc1, cc2; + u8 role = 0; + u32 rxdz_en = 0, rxdz_sel = 0; + + ret = rt1711h_read8(chip, TCPC_ROLE_CTRL, &role); + if (ret < 0) + return ret; + + cc1 = tcpci_to_typec_cc((status >> TCPC_CC_STATUS_CC1_SHIFT) & + TCPC_CC_STATUS_CC1_MASK, + status & TCPC_CC_STATUS_TERM || + tcpc_presenting_rd(role, CC1)); + cc2 = tcpci_to_typec_cc((status >> TCPC_CC_STATUS_CC2_SHIFT) & + TCPC_CC_STATUS_CC2_MASK, + status & TCPC_CC_STATUS_TERM || + tcpc_presenting_rd(role, CC2)); + + if ((cc1 >= TYPEC_CC_RP_1_5 && cc2 < TYPEC_CC_RP_DEF) || + (cc2 >= TYPEC_CC_RP_1_5 && cc1 < TYPEC_CC_RP_DEF)) { + if (chip->did == RT1715_DID) { + rxdz_en = 1; + rxdz_sel = 1; + } else { + rxdz_en = 1; + rxdz_sel = 0; + } + } else { + rxdz_en = 0; + rxdz_sel = 1; + } + + ret = regmap_update_bits(chip->data.regmap, RT1711H_RTCTRL18, + BMCIO_RXDZEN_MASK, rxdz_en); + if (ret < 0) + return ret; + + return regmap_update_bits(chip->data.regmap, RT1711H_RTCTRL4, + RT1711H_BMCIO_RXDZSEL, rxdz_sel); +} + static int rt1711h_start_drp_toggling(struct tcpci *tcpci, struct tcpci_data *tdata, enum typec_cc_status cc) @@ -222,6 +299,8 @@ static irqreturn_t rt1711h_irq(int irq, void *dev_id) /* Clear cc change event triggered by starting toggling */ if (status & TCPC_CC_STATUS_TOGGLING) rt1711h_write8(chip, TCPC_ALERT, TCPC_ALERT_CC_STATUS); + else + rt1711h_init_cc_params(chip, status); } out: -- 2.25.1