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Tue, 6 May 2025 02:59:47 -0700 From: Akhil R To: , , , , , , , , , , , , CC: Akhil R Subject: [PATCH 1/4] dt-bindings: i2c: Specify reset as optional Date: Tue, 6 May 2025 15:29:33 +0530 Message-ID: <20250506095936.10687-1-akhilrajeev@nvidia.com> X-Mailer: git-send-email 2.43.2 Precedence: bulk X-Mailing-List: linux-i2c@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-NVConfidentiality: public X-NV-OnPremToCloud: AnonymousSubmission X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS2PEPF0000343E:EE_|CYXPR12MB9428:EE_ X-MS-Office365-Filtering-Correlation-Id: af0dbcaa-c5d6-42be-1d99-08dd8c84c606 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; ARA:13230040|376014|7416014|1800799024|36860700013|82310400026|921020; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:216.228.117.160; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge1.nvidia.com; CAT:NONE; SFS:(13230040)(376014)(7416014)(1800799024)(36860700013)(82310400026)(921020); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2025 10:00:04.0812 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: af0dbcaa-c5d6-42be-1d99-08dd8c84c606 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF0000343E.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CYXPR12MB9428 Specify reset as optional in the description for controllers that has an internal software reset available Signed-off-by: Akhil R --- Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml index b57ae6963e62..19aefc022c8b 100644 --- a/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml +++ b/Documentation/devicetree/bindings/i2c/nvidia,tegra20-i2c.yaml @@ -97,7 +97,9 @@ properties: resets: items: - - description: module reset + - description: | + Module reset. 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This is useful in systems that choose to restrict reset control from Linux. Signed-off-by: Akhil R --- drivers/i2c/busses/i2c-tegra.c | 35 ++++++++++++++++++++++++++++++++-- 1 file changed, 33 insertions(+), 2 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 87976e99e6d0..49b77dcef184 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -134,6 +134,8 @@ #define I2C_MST_FIFO_STATUS_TX GENMASK(23, 16) #define I2C_MST_FIFO_STATUS_RX GENMASK(7, 0) +#define I2C_MASTER_RESET_CNTRL 0x0a8 + /* configuration load timeout in microseconds */ #define I2C_CONFIG_LOAD_TIMEOUT 1000000 @@ -184,6 +186,9 @@ enum msg_end_type { * @has_mst_fifo: The I2C controller contains the new MST FIFO interface that * provides additional features and allows for longer messages to * be transferred in one go. + * @has_mst_reset: The I2C controller contains MASTER_RESET_CTRL register which + * provides an alternative to controller reset when configured as + * I2C master * @quirks: I2C adapter quirks for limiting write/read transfer size and not * allowing 0 length transfers. * @supports_bus_clear: Bus Clear support to recover from bus hang during @@ -213,6 +218,7 @@ struct tegra_i2c_hw_feature { bool has_multi_master_mode; bool has_slcg_override_reg; bool has_mst_fifo; + bool has_mst_reset; const struct i2c_adapter_quirks *quirks; bool supports_bus_clear; bool has_apb_dma; @@ -604,6 +610,18 @@ static int tegra_i2c_wait_for_config_load(struct tegra_i2c_dev *i2c_dev) return 0; } +static int tegra_i2c_master_reset(struct tegra_i2c_dev *i2c_dev) +{ + if (!i2c_dev->hw->has_mst_reset) + return -EOPNOTSUPP; + + i2c_writel(i2c_dev, 0x1, I2C_MASTER_RESET_CNTRL); + udelay(1); + i2c_writel(i2c_dev, 0x0, I2C_MASTER_RESET_CNTRL); + + return 0; +} + static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) { u32 val, clk_divisor, clk_multiplier, tsu_thd, tlow, thigh, non_hs_mode; @@ -621,8 +639,10 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev) */ if (handle) err = acpi_evaluate_object(handle, "_RST", NULL, NULL); - else + else if (i2c_dev->rst) err = reset_control_reset(i2c_dev->rst); + else + err = tegra_i2c_master_reset(i2c_dev); WARN_ON_ONCE(err); @@ -1467,6 +1487,7 @@ static const struct tegra_i2c_hw_feature tegra20_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = false, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = false, .has_apb_dma = true, @@ -1491,6 +1512,7 @@ static const struct tegra_i2c_hw_feature tegra30_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = false, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = false, .has_apb_dma = true, @@ -1515,6 +1537,7 @@ static const struct tegra_i2c_hw_feature tegra114_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = false, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = true, .has_apb_dma = true, @@ -1539,6 +1562,7 @@ static const struct tegra_i2c_hw_feature tegra124_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = true, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = true, .has_apb_dma = true, @@ -1563,6 +1587,7 @@ static const struct tegra_i2c_hw_feature tegra210_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = true, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = true, .has_apb_dma = true, @@ -1587,6 +1612,7 @@ static const struct tegra_i2c_hw_feature tegra186_i2c_hw = { .has_multi_master_mode = false, .has_slcg_override_reg = true, .has_mst_fifo = false, + .has_mst_reset = false, .quirks = &tegra_i2c_quirks, .supports_bus_clear = true, .has_apb_dma = false, @@ -1611,6 +1637,7 @@ static const struct tegra_i2c_hw_feature tegra194_i2c_hw = { .has_multi_master_mode = true, .has_slcg_override_reg = true, .has_mst_fifo = true, + .has_mst_reset = true, .quirks = &tegra194_i2c_quirks, .supports_bus_clear = true, .has_apb_dma = false, @@ -1666,7 +1693,11 @@ static int tegra_i2c_init_reset(struct tegra_i2c_dev *i2c_dev) if (ACPI_HANDLE(i2c_dev->dev)) return 0; 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CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge1.nvidia.com; CAT:NONE; SFS:(13230040)(1800799024)(36860700013)(82310400026)(376014)(7416014)(921020); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 May 2025 10:00:33.5245 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5d0fafb4-6924-4963-c620-08dd8c84d792 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS2PEPF00003440.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR12MB5902 Calling dma_sync_*() on a buffer from dma_alloc_coherent() is pointless. The driver should not be doing its own bounce-buffering if the buffer is allocated through dma_alloc_coherent() Suggested-by: Robin Murphy Signed-off-by: Akhil R --- drivers/i2c/busses/i2c-tegra.c | 20 +------------------- 1 file changed, 1 insertion(+), 19 deletions(-) diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c index 49b77dcef184..35057e977688 100644 --- a/drivers/i2c/busses/i2c-tegra.c +++ b/drivers/i2c/busses/i2c-tegra.c @@ -1290,17 +1290,9 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (i2c_dev->dma_mode) { if (i2c_dev->msg_read) { - dma_sync_single_for_device(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_FROM_DEVICE); - err = tegra_i2c_dma_submit(i2c_dev, xfer_size); if (err) return err; - } else { - dma_sync_single_for_cpu(i2c_dev->dma_dev, - i2c_dev->dma_phys, - xfer_size, DMA_TO_DEVICE); } } @@ -1310,11 +1302,6 @@ static int tegra_i2c_xfer_msg(struct tegra_i2c_dev *i2c_dev, if (i2c_dev->dma_mode) { memcpy(i2c_dev->dma_buf + I2C_PACKET_HEADER_SIZE, msg->buf, i2c_dev->msg_len); 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Signed-off-by: Akhil R --- arch/arm64/boot/dts/nvidia/tegra234.dtsi | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/arm64/boot/dts/nvidia/tegra234.dtsi b/arch/arm64/boot/dts/nvidia/tegra234.dtsi index 2601b43b2d8c..c9f3724d2418 100644 --- a/arch/arm64/boot/dts/nvidia/tegra234.dtsi +++ b/arch/arm64/boot/dts/nvidia/tegra234.dtsi @@ -16,6 +16,18 @@ / { #address-cells = <2>; #size-cells = <2>; + aliases { + i2c0 = &gen1_i2c; + i2c1 = &gen2_i2c; + i2c2 = &cam_i2c; + i2c3 = &dp_aux_ch1_i2c; + i2c4 = &bpmp_i2c; + i2c5 = &dp_aux_ch0_i2c; + i2c6 = &dp_aux_ch2_i2c; + i2c7 = &gen8_i2c; + i2c8 = &dp_aux_ch3_i2c; + }; + bus@0 { compatible = "simple-bus";