From patchwork Wed Feb 24 03:30:39 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 386918 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, UPPERCASE_50_75, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CCA43C433E0 for ; Wed, 24 Feb 2021 03:32:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73BF264ED4 for ; Wed, 24 Feb 2021 03:32:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233360AbhBXDcV (ORCPT ); Tue, 23 Feb 2021 22:32:21 -0500 Received: from m42-2.mailgun.net ([69.72.42.2]:30560 "EHLO m42-2.mailgun.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233418AbhBXDcD (ORCPT ); Tue, 23 Feb 2021 22:32:03 -0500 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1614137497; h=References: In-Reply-To: Message-Id: Date: Subject: Cc: To: From: Sender; bh=glMWfEKveaTT2wZGHyqDYNLPww9uubpB8hoGFVn+YkQ=; b=OVasNU5ryLylbwiVd8Gp7kuhIEq2sfan+gUEuBw4AmqeLDm85F6WDKVgecc+TvMRNaFkR78J TREZHSPUAECsLTMVnWH68cOJKd80StST9hUnMcyrxrKcZDieTNraFAVjzMgbivZBYhE+pBi8 V/t3yvwOLiof2D4zUbhGDl6S/qk= X-Mailgun-Sending-Ip: 69.72.42.2 X-Mailgun-Sid: WyI1MzIzYiIsICJsaW51eC1hcm0tbXNtQHZnZXIua2VybmVsLm9yZyIsICJiZTllNGEiXQ== Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n02.prod.us-west-2.postgun.com with SMTP id 6035c86aba086638307cad87 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Wed, 24 Feb 2021 03:30:50 GMT Sender: bbhatt=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id 4F69DC43461; Wed, 24 Feb 2021 03:30:50 +0000 (UTC) Received: from malabar-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id 33974C433CA; Wed, 24 Feb 2021 03:30:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 33974C433CA Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, carl.yin@quectel.com, naveen.kumar@quectel.com, Bhaumik Bhatt Subject: [PATCH v2 1/3] bus: mhi: core: Introduce internal register poll helper function Date: Tue, 23 Feb 2021 19:30:39 -0800 Message-Id: <1614137441-18872-2-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1614137441-18872-1-git-send-email-bbhatt@codeaurora.org> References: <1614137441-18872-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org Introduce helper function to allow MHI core driver to poll for a value in a register field. This helps reach a common path to read and poll register values along with a retry time interval. Signed-off-by: Bhaumik Bhatt --- arch/arm64/configs/defconfig | 76 ++++++++++++++++------------------------- drivers/bus/mhi/core/internal.h | 3 ++ drivers/bus/mhi/core/main.c | 23 +++++++++++++ 3 files changed, 55 insertions(+), 47 deletions(-) diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig index 8383016..b3bc98a 100644 --- a/arch/arm64/configs/defconfig +++ b/arch/arm64/configs/defconfig @@ -13,7 +13,6 @@ CONFIG_IKCONFIG=y CONFIG_IKCONFIG_PROC=y CONFIG_NUMA_BALANCING=y CONFIG_MEMCG=y -CONFIG_MEMCG_SWAP=y CONFIG_BLK_CGROUP=y CONFIG_CGROUP_PIDS=y CONFIG_CGROUP_HUGETLB=y @@ -66,7 +65,6 @@ CONFIG_ARM64_VA_BITS_48=y CONFIG_SCHED_MC=y CONFIG_SCHED_SMT=y CONFIG_NUMA=y -CONFIG_SECCOMP=y CONFIG_KEXEC=y CONFIG_KEXEC_FILE=y CONFIG_CRASH_DUMP=y @@ -84,7 +82,6 @@ CONFIG_CPU_FREQ_GOV_POWERSAVE=m CONFIG_CPU_FREQ_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_ONDEMAND=y CONFIG_CPU_FREQ_GOV_CONSERVATIVE=m -CONFIG_CPU_FREQ_GOV_SCHEDUTIL=y CONFIG_CPUFREQ_DT=y CONFIG_ACPI_CPPC_CPUFREQ=m CONFIG_ARM_ALLWINNER_SUN50I_CPUFREQ_NVMEM=m @@ -102,14 +99,12 @@ CONFIG_ARM_SCPI_PROTOCOL=y CONFIG_RASPBERRYPI_FIRMWARE=y CONFIG_INTEL_STRATIX10_SERVICE=y CONFIG_INTEL_STRATIX10_RSU=m -CONFIG_QCOM_SCM=y CONFIG_EFI_CAPSULE_LOADER=y CONFIG_IMX_SCU=y CONFIG_IMX_SCU_PD=y CONFIG_ACPI=y CONFIG_ACPI_APEI=y CONFIG_ACPI_APEI_GHES=y -CONFIG_ACPI_APEI_PCIEAER=y CONFIG_ACPI_APEI_MEMORY_FAILURE=y CONFIG_ACPI_APEI_EINJ=y CONFIG_VIRTUALIZATION=y @@ -182,14 +177,14 @@ CONFIG_NET_ACT_GATE=m CONFIG_QRTR=m CONFIG_QRTR_SMD=m CONFIG_QRTR_TUN=m +CONFIG_QRTR_MHI=m CONFIG_BPF_JIT=y CONFIG_CAN=m +CONFIG_CAN_FLEXCAN=m CONFIG_CAN_RCAR=m CONFIG_CAN_RCAR_CANFD=m -CONFIG_CAN_FLEXCAN=m CONFIG_BT=m CONFIG_BT_HIDP=m -# CONFIG_BT_HS is not set # CONFIG_BT_LE is not set CONFIG_BT_LEDS=y # CONFIG_BT_DEBUGFS is not set @@ -226,13 +221,13 @@ CONFIG_PCI_HOST_THUNDER_ECAM=y CONFIG_PCIE_ROCKCHIP_HOST=m CONFIG_PCIE_BRCMSTB=m CONFIG_PCI_LAYERSCAPE=y -CONFIG_PCIE_LAYERSCAPE_GEN4=y CONFIG_PCI_HISI=y CONFIG_PCIE_QCOM=y CONFIG_PCIE_ARMADA_8K=y CONFIG_PCIE_KIRIN=y CONFIG_PCIE_HISI_STB=y CONFIG_PCIE_TEGRA194_HOST=m +CONFIG_PCIE_LAYERSCAPE_GEN4=y CONFIG_PCI_ENDPOINT=y CONFIG_PCI_ENDPOINT_CONFIGFS=y CONFIG_PCI_EPF_TEST=m @@ -242,8 +237,9 @@ CONFIG_FW_LOADER_USER_HELPER=y CONFIG_FW_LOADER_USER_HELPER_FALLBACK=y CONFIG_HISILICON_LPC=y CONFIG_SIMPLE_PM_BUS=y -CONFIG_FSL_MC_BUS=y CONFIG_TEGRA_ACONNECT=m +CONFIG_MHI_BUS=y +CONFIG_MHI_BUS_DEBUG=y CONFIG_GNSS=m CONFIG_GNSS_MTK_SERIAL=m CONFIG_MTD=y @@ -263,7 +259,6 @@ CONFIG_MTD_NAND_MARVELL=y CONFIG_MTD_NAND_FSL_IFC=y CONFIG_MTD_NAND_QCOM=y CONFIG_MTD_SPI_NOR=y -CONFIG_SPI_CADENCE_QUADSPI=y CONFIG_BLK_DEV_LOOP=y CONFIG_BLK_DEV_NBD=m CONFIG_VIRTIO_BLK=y @@ -348,18 +343,18 @@ CONFIG_SNI_NETSEC=y CONFIG_STMMAC_ETH=m CONFIG_TI_K3_AM65_CPSW_NUSS=y CONFIG_QCOM_IPA=m -CONFIG_MDIO_BUS_MUX_MMIOREG=y -CONFIG_MDIO_BUS_MUX_MULTIPLEXER=y +CONFIG_MESON_GXL_PHY=m CONFIG_AQUANTIA_PHY=y CONFIG_MARVELL_PHY=m CONFIG_MARVELL_10G_PHY=m -CONFIG_MESON_GXL_PHY=m CONFIG_MICREL_PHY=y CONFIG_MICROSEMI_PHY=y CONFIG_AT803X_PHY=y CONFIG_REALTEK_PHY=m CONFIG_ROCKCHIP_PHY=y CONFIG_VITESSE_PHY=y +CONFIG_MDIO_BUS_MUX_MULTIPLEXER=y +CONFIG_MDIO_BUS_MUX_MMIOREG=y CONFIG_USB_PEGASUS=m CONFIG_USB_RTL8150=m CONFIG_USB_RTL8152=m @@ -461,6 +456,7 @@ CONFIG_SPI=y CONFIG_SPI_ARMADA_3700=y CONFIG_SPI_BCM2835=m CONFIG_SPI_BCM2835AUX=m +CONFIG_SPI_CADENCE_QUADSPI=y CONFIG_SPI_FSL_LPSPI=y CONFIG_SPI_FSL_QUADSPI=y CONFIG_SPI_NXP_FLEXSPI=y @@ -523,9 +519,6 @@ CONFIG_GPIO_PCA953X_IRQ=y CONFIG_GPIO_BD9571MWV=m CONFIG_GPIO_MAX77620=y CONFIG_GPIO_SL28CPLD=m -CONFIG_POWER_AVS=y -CONFIG_QCOM_CPR=y -CONFIG_ROCKCHIP_IODOMAIN=y CONFIG_POWER_RESET_MSM=y CONFIG_POWER_RESET_QCOM_PON=m CONFIG_POWER_RESET_XGENE=y @@ -533,9 +526,9 @@ CONFIG_POWER_RESET_SYSCON=y CONFIG_SYSCON_REBOOT_MODE=y CONFIG_BATTERY_SBS=m CONFIG_BATTERY_BQ27XXX=y -CONFIG_SENSORS_ARM_SCMI=y CONFIG_BATTERY_MAX17042=m CONFIG_CHARGER_BQ25980=m +CONFIG_SENSORS_ARM_SCMI=y CONFIG_SENSORS_ARM_SCPI=y CONFIG_SENSORS_LM90=m CONFIG_SENSORS_PWM_FAN=m @@ -546,10 +539,10 @@ CONFIG_SENSORS_INA3221=m CONFIG_THERMAL_GOV_POWER_ALLOCATOR=y CONFIG_CPU_THERMAL=y CONFIG_THERMAL_EMULATION=y -CONFIG_QORIQ_THERMAL=m -CONFIG_SUN8I_THERMAL=y CONFIG_IMX_SC_THERMAL=m CONFIG_IMX8MM_THERMAL=m +CONFIG_QORIQ_THERMAL=m +CONFIG_SUN8I_THERMAL=y CONFIG_ROCKCHIP_THERMAL=m CONFIG_RCAR_THERMAL=y CONFIG_RCAR_GEN3_THERMAL=y @@ -566,7 +559,6 @@ CONFIG_WATCHDOG=y CONFIG_SL28CPLD_WATCHDOG=m CONFIG_ARM_SP805_WATCHDOG=y CONFIG_ARM_SBSA_WATCHDOG=y -CONFIG_ARM_SMC_WATCHDOG=y CONFIG_S3C2410_WATCHDOG=y CONFIG_DW_WATCHDOG=y CONFIG_SUNXI_WATCHDOG=m @@ -575,6 +567,7 @@ CONFIG_IMX_SC_WDT=m CONFIG_QCOM_WDT=m CONFIG_MESON_GXBB_WATCHDOG=m CONFIG_MESON_WATCHDOG=m +CONFIG_ARM_SMC_WATCHDOG=y CONFIG_RENESAS_WDT=y CONFIG_UNIPHIER_WATCHDOG=y CONFIG_BCM2835_WDT=y @@ -622,13 +615,12 @@ CONFIG_MEDIA_CAMERA_SUPPORT=y CONFIG_MEDIA_ANALOG_TV_SUPPORT=y CONFIG_MEDIA_DIGITAL_TV_SUPPORT=y CONFIG_MEDIA_SDR_SUPPORT=y -CONFIG_MEDIA_CONTROLLER=y -CONFIG_VIDEO_V4L2_SUBDEV_API=y CONFIG_MEDIA_PLATFORM_SUPPORT=y # CONFIG_DVB_NET is not set CONFIG_MEDIA_USB_SUPPORT=y CONFIG_USB_VIDEO_CLASS=m CONFIG_V4L_PLATFORM_DRIVERS=y +CONFIG_VIDEO_QCOM_CAMSS=m CONFIG_VIDEO_RCAR_CSI2=m CONFIG_VIDEO_RCAR_VIN=m CONFIG_VIDEO_SUN6I_CSI=m @@ -643,7 +635,6 @@ CONFIG_SDR_PLATFORM_DRIVERS=y CONFIG_VIDEO_RCAR_DRIF=m CONFIG_VIDEO_IMX219=m CONFIG_VIDEO_OV5645=m -CONFIG_VIDEO_QCOM_CAMSS=m CONFIG_DRM=m CONFIG_DRM_I2C_NXP_TDA998X=m CONFIG_DRM_MALI_DISPLAY=m @@ -677,8 +668,8 @@ CONFIG_DRM_PANEL_RAYDIUM_RM67191=m CONFIG_DRM_PANEL_SITRONIX_ST7703=m CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA=m CONFIG_DRM_DISPLAY_CONNECTOR=m -CONFIG_DRM_NWL_MIPI_DSI=m CONFIG_DRM_LONTIUM_LT9611=m +CONFIG_DRM_NWL_MIPI_DSI=m CONFIG_DRM_SII902X=m CONFIG_DRM_SIMPLE_BRIDGE=m CONFIG_DRM_THINE_THC63LVD1024=m @@ -711,7 +702,6 @@ CONFIG_SND_HDA_TEGRA=m CONFIG_SND_HDA_CODEC_HDMI=m CONFIG_SND_SOC=y CONFIG_SND_BCM2835_SOC_I2S=m -CONFIG_SND_SOC_FSL_SAI=m CONFIG_SND_SOC_FSL_ASRC=m CONFIG_SND_SOC_FSL_MICFIL=m CONFIG_SND_SOC_FSL_EASRC=m @@ -750,7 +740,6 @@ CONFIG_SND_SOC_WSA881X=m CONFIG_SND_SIMPLE_CARD=m CONFIG_SND_AUDIO_GRAPH_CARD=m CONFIG_I2C_HID=m -CONFIG_USB_CONN_GPIO=m CONFIG_USB=y CONFIG_USB_OTG=y CONFIG_USB_XHCI_HCD=y @@ -887,14 +876,13 @@ CONFIG_VIRTIO_BALLOON=y CONFIG_VIRTIO_MMIO=y CONFIG_XEN_GNTDEV=y CONFIG_XEN_GRANT_DEV_ALLOC=y -CONFIG_MFD_CROS_EC_DEV=y CONFIG_CHROME_PLATFORMS=y CONFIG_CROS_EC=y CONFIG_CROS_EC_I2C=y CONFIG_CROS_EC_SPI=y CONFIG_CROS_EC_CHARDEV=m -CONFIG_COMMON_CLK_SCMI=y CONFIG_COMMON_CLK_RK808=y +CONFIG_COMMON_CLK_SCMI=y CONFIG_COMMON_CLK_SCPI=y CONFIG_COMMON_CLK_CS2000_CP=y CONFIG_COMMON_CLK_FSL_SAI=y @@ -914,8 +902,8 @@ CONFIG_QCOM_A53PLL=y CONFIG_QCOM_CLK_APCS_MSM8916=y CONFIG_QCOM_CLK_SMD_RPM=y CONFIG_QCOM_CLK_RPMH=y -CONFIG_IPQ_GCC_8074=y CONFIG_IPQ_GCC_6018=y +CONFIG_IPQ_GCC_8074=y CONFIG_MSM_GCC_8916=y CONFIG_MSM_GCC_8994=y CONFIG_MSM_MMCC_8996=y @@ -923,12 +911,9 @@ CONFIG_MSM_GCC_8998=y CONFIG_QCS_GCC_404=y CONFIG_SC_GCC_7180=y CONFIG_SDM_CAMCC_845=m -CONFIG_SDM_GCC_845=y CONFIG_SDM_GPUCC_845=y CONFIG_SDM_VIDEOCC_845=y CONFIG_SDM_DISPCC_845=y -CONFIG_SM_GCC_8150=y -CONFIG_SM_GCC_8250=y CONFIG_SM_GPUCC_8150=y CONFIG_SM_GPUCC_8250=y CONFIG_QCOM_HFPLL=y @@ -960,6 +945,7 @@ CONFIG_FSL_DPAA=y CONFIG_FSL_MC_DPIO=y CONFIG_QCOM_AOSS_QMP=y CONFIG_QCOM_COMMAND_DB=y +CONFIG_QCOM_CPR=y CONFIG_QCOM_GENI_SE=y CONFIG_QCOM_RMTFS_MEM=m CONFIG_QCOM_RPMH=y @@ -971,28 +957,27 @@ CONFIG_QCOM_SMP2P=y CONFIG_QCOM_SMSM=y CONFIG_QCOM_SOCINFO=m CONFIG_QCOM_APR=m -CONFIG_ARCH_R8A774A1=y -CONFIG_ARCH_R8A774B1=y -CONFIG_ARCH_R8A774C0=y -CONFIG_ARCH_R8A774E1=y +CONFIG_ARCH_R8A77995=y +CONFIG_ARCH_R8A77990=y CONFIG_ARCH_R8A77950=y CONFIG_ARCH_R8A77951=y +CONFIG_ARCH_R8A77965=y CONFIG_ARCH_R8A77960=y CONFIG_ARCH_R8A77961=y -CONFIG_ARCH_R8A77965=y -CONFIG_ARCH_R8A77970=y CONFIG_ARCH_R8A77980=y -CONFIG_ARCH_R8A77990=y -CONFIG_ARCH_R8A77995=y +CONFIG_ARCH_R8A77970=y CONFIG_ARCH_R8A779A0=y +CONFIG_ARCH_R8A774C0=y +CONFIG_ARCH_R8A774E1=y +CONFIG_ARCH_R8A774A1=y +CONFIG_ARCH_R8A774B1=y +CONFIG_ROCKCHIP_IODOMAIN=y CONFIG_ROCKCHIP_PM_DOMAINS=y CONFIG_ARCH_TEGRA_132_SOC=y CONFIG_ARCH_TEGRA_210_SOC=y CONFIG_ARCH_TEGRA_186_SOC=y CONFIG_ARCH_TEGRA_194_SOC=y CONFIG_ARCH_TEGRA_234_SOC=y -CONFIG_ARCH_K3_AM6_SOC=y -CONFIG_ARCH_K3_J721E_SOC=y CONFIG_TI_SCI_PM_DOMAINS=y CONFIG_EXTCON_PTN5150=m CONFIG_EXTCON_USB_GPIO=y @@ -1052,9 +1037,9 @@ CONFIG_PHY_UNIPHIER_USB3=y CONFIG_PHY_TEGRA_XUSB=y CONFIG_ARM_SMMU_V3_PMU=m CONFIG_FSL_IMX8_DDR_PMU=m -CONFIG_HISI_PMU=y CONFIG_QCOM_L2_PMU=y CONFIG_QCOM_L3_PMU=y +CONFIG_HISI_PMU=y CONFIG_NVMEM_IMX_OCOTP=y CONFIG_NVMEM_IMX_OCOTP_SCU=y CONFIG_QCOM_QFPROM=y @@ -1070,11 +1055,9 @@ CONFIG_FPGA_REGION=m CONFIG_OF_FPGA_REGION=m CONFIG_TEE=y CONFIG_OPTEE=y -CONFIG_SLIMBUS=m +CONFIG_MUX_MMIO=y CONFIG_SLIM_QCOM_CTRL=m CONFIG_SLIM_QCOM_NGD_CTRL=m -CONFIG_MUX_MMIO=y -CONFIG_INTERCONNECT=y CONFIG_INTERCONNECT_QCOM=y CONFIG_INTERCONNECT_QCOM_MSM8916=m CONFIG_INTERCONNECT_QCOM_OSM_L3=m @@ -1095,7 +1078,6 @@ CONFIG_CUSE=m CONFIG_OVERLAY_FS=m CONFIG_VFAT_FS=y CONFIG_HUGETLBFS=y -CONFIG_CONFIGFS_FS=y CONFIG_EFIVAR_FS=y CONFIG_SQUASHFS=y CONFIG_NFS_FS=y diff --git a/drivers/bus/mhi/core/internal.h b/drivers/bus/mhi/core/internal.h index 6f80ec3..005286b 100644 --- a/drivers/bus/mhi/core/internal.h +++ b/drivers/bus/mhi/core/internal.h @@ -643,6 +643,9 @@ int __must_check mhi_read_reg(struct mhi_controller *mhi_cntrl, int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 mask, u32 shift, u32 *out); +int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl, + void __iomem *base, u32 offset, u32 mask, + u32 shift, u32 val, u32 delayus); void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 val); void mhi_write_reg_field(struct mhi_controller *mhi_cntrl, void __iomem *base, diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 4e0131b..249ae26 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -4,6 +4,7 @@ * */ +#include #include #include #include @@ -37,6 +38,28 @@ int __must_check mhi_read_reg_field(struct mhi_controller *mhi_cntrl, return 0; } +int __must_check mhi_poll_reg_field(struct mhi_controller *mhi_cntrl, + void __iomem *base, u32 offset, + u32 mask, u32 shift, u32 val, u32 delayus) +{ + int ret = -ENOENT; + u32 out, retry = (mhi_cntrl->timeout_ms * 1000) / delayus; + + while (retry--) { + ret = mhi_read_reg_field(mhi_cntrl, base, offset, mask, shift, + &out); + if (ret) + return -EIO; + + if (out == val) + return 0; + + udelay(delayus); + } + + return ret; +} + void mhi_write_reg(struct mhi_controller *mhi_cntrl, void __iomem *base, u32 offset, u32 val) { From patchwork Wed Feb 24 03:30:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Bhaumik Bhatt X-Patchwork-Id: 386919 Return-Path: X-Spam-Checker-Version: SpamAssassin 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from malabar-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: bbhatt) by smtp.codeaurora.org (Postfix) with ESMTPSA id D3428C433ED; Wed, 24 Feb 2021 03:30:49 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org D3428C433ED Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=bbhatt@codeaurora.org From: Bhaumik Bhatt To: manivannan.sadhasivam@linaro.org Cc: linux-arm-msm@vger.kernel.org, hemantk@codeaurora.org, jhugo@codeaurora.org, linux-kernel@vger.kernel.org, loic.poulain@linaro.org, carl.yin@quectel.com, naveen.kumar@quectel.com, Bhaumik Bhatt Subject: [PATCH v2 2/3] bus: mhi: core: Move to polling method to wait for MHI ready Date: Tue, 23 Feb 2021 19:30:40 -0800 Message-Id: <1614137441-18872-3-git-send-email-bbhatt@codeaurora.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1614137441-18872-1-git-send-email-bbhatt@codeaurora.org> References: <1614137441-18872-1-git-send-email-bbhatt@codeaurora.org> Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@vger.kernel.org In certain devices, it is likely that there is no incoming MHI interrupt for a transition to MHI READY state. One such example is the move from Pass Through to an SBL or AMSS execution environment. In order to facilitate faster bootup times as there is no need to wait until timeout_ms completes, MHI host can poll every 25 milliseconds to check if device has entered MHI READY until a maximum timeout of twice the timeout_ms is reached. Signed-off-by: Bhaumik Bhatt --- drivers/bus/mhi/core/pm.c | 31 ++++++++++++++----------------- 1 file changed, 14 insertions(+), 17 deletions(-) diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c index 681960c..5fe33d4 100644 --- a/drivers/bus/mhi/core/pm.c +++ b/drivers/bus/mhi/core/pm.c @@ -153,34 +153,31 @@ static void mhi_toggle_dev_wake(struct mhi_controller *mhi_cntrl) /* Handle device ready state transition */ int mhi_ready_state_transition(struct mhi_controller *mhi_cntrl) { - void __iomem *base = mhi_cntrl->regs; struct mhi_event *mhi_event; enum mhi_pm_state cur_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; - u32 reset = 1, ready = 0; int ret, i; - /* Wait for RESET to be cleared and READY bit to be set by the device */ - wait_event_timeout(mhi_cntrl->state_event, - MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state) || - mhi_read_reg_field(mhi_cntrl, base, MHICTRL, - MHICTRL_RESET_MASK, - MHICTRL_RESET_SHIFT, &reset) || - mhi_read_reg_field(mhi_cntrl, base, MHISTATUS, - MHISTATUS_READY_MASK, - MHISTATUS_READY_SHIFT, &ready) || - (!reset && ready), - msecs_to_jiffies(mhi_cntrl->timeout_ms)); - /* Check if device entered error state */ if (MHI_PM_IN_FATAL_STATE(mhi_cntrl->pm_state)) { dev_err(dev, "Device link is not accessible\n"); return -EIO; } - /* Timeout if device did not transition to ready state */ - if (reset || !ready) { - dev_err(dev, "Device Ready timeout\n"); + /* Wait for RESET to be cleared and READY bit to be set by the device */ + ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHICTRL, + MHICTRL_RESET_MASK, MHICTRL_RESET_SHIFT, 0, + 25000); + if (ret) { + dev_err(dev, "Device failed to clear MHI Reset\n"); + return -ETIMEDOUT; + } + + ret = mhi_poll_reg_field(mhi_cntrl, mhi_cntrl->regs, MHISTATUS, + MHISTATUS_READY_MASK, MHISTATUS_READY_SHIFT, 1, + 25000); + if (ret) { + dev_err(dev, "Device failed to enter MHI Ready\n"); return -ETIMEDOUT; }