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[72.90.70.109]) by smtp.gmail.com with ESMTPSA id ek3-20020a05622a4fc300b003b68ea3d5c8sm1505678qtb.41.2023.01.26.14.40.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:40:49 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:40:43 -0500 Subject: [PATCH v2 2/4] drm/bridge: tfp410: Support basic I2C interface MIME-Version: 1.0 Message-Id: <20230125-tfp410_i2c-v2-2-bf22f4dcbcea@criticallink.com> References: <20230125-tfp410_i2c-v2-0-bf22f4dcbcea@criticallink.com> In-Reply-To: <20230125-tfp410_i2c-v2-0-bf22f4dcbcea@criticallink.com> To: Andrzej Hajda , Neil Armstrong , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Rob Herring , Krzysztof Kozlowski Cc: dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Michael Williamson , Bob Duke , Jonathan Cormier X-Mailer: b4 0.12.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=6492; i=jcormier@criticallink.com; h=from:subject:message-id; bh=XWThcU4Z36mFj7a764RgSd+QtYAddWcIDsaMnqm/1io=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0wFu0nfKBjU/FSlWT9m7wefZDzy53qLToZJ8CX3h sOGelZiJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9MBbgAKCRDc1/0uCzbrqrUyEA Cwzc7d7tH3He5RfIoqtNRKHNlpzLiqb+DN3hWjuxmtdV6827n8KvFm0Lb+SF+sPatVzSBXeOU5mU1g O0cH4tc7c1qI2RLXUuRwE3Hex0C2uaAYbvZWJVs2qKlntORGaLSXsrskNYvWypvK5bY9jcoPbgPrsS oLkJmii6cVXvHd3ojIEabzlJWcWD80G4lpdEQRqlODSahDKY4v54juDzf2WlzBn71Y9K+sWZRevPAi zSOktGGRovRs3O/BR5dsv/zChqLpUvw9EnRep9gsFGyyQvNFnJ4rxNENiu6OQR4zmhOixDgCYl0St7 uBLZ4WOzLcMUSgq3NyYxux9Y2ZkmCNLjfKtWjKHhaYcPKw5TG9HkTvyYKy+m2bcsv82CMP2A/7svM2 k5o2IvUcOnp8fH5+7HUMrdLfimrKEAVSPqkbMSxrl7I0p2RDLF999YrOXXGe/itrP/kfI12/IL6rKq 4wJP6uP02GD70ybGh130Si9h7ej+AAT0xY9XEc850WyLW8jyyPFT1rm5sW6YY96HdmeFlARsFJ/Wd5 HNZNcqAuKMZFdvI4tMf1nbGjIV/cJ4f03Juny0Sb7aGlDND9vuP4iaJhBbCZr1yGDH9TggXYjXUiIk HKf0R214Jih07nEXPyuYZsZp+p2MjoMUT/mWcz8vV2XRF+bGMk2kP9tbyDdA== X-Developer-Key: i=jcormier@criticallink.com; a=openpgp; fpr=FF328CEA09E66D63136754DFDCD7FD2E0B36EBAA X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,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 X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756127516921128923?= X-GMAIL-MSGID: =?utf-8?q?1756127516921128923?= From: Michael Williamson The TFP410 driver does not support I2C. As such, the device remains in Power Down if the I2C is enabled by the bootstrap pins. Add basic support for the I2C interface, and provide support to take the device out of power down when enabled. Also read the bootstrap mode pins via the CTL_1_MODE register when using the I2C bus. Signed-off-by: Michael Williamson Signed-off-by: Jonathan Cormier --- drivers/gpu/drm/bridge/ti-tfp410.c | 93 +++++++++++++++++++++++++++----------- 1 file changed, 67 insertions(+), 26 deletions(-) diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index b9635abbad16..bb3f8d0ff207 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -6,6 +6,7 @@ #include #include +#include #include #include #include @@ -21,6 +22,20 @@ #define HOTPLUG_DEBOUNCE_MS 1100 +#define TFP410_REG_CTL_1_MODE 0x08 +#define TFP410_BIT_PD BIT(0) +#define TFP410_BIT_EDGE BIT(1) +#define TFP410_BIT_BSEL BIT(2) +#define TFP410_BIT_DSEL BIT(3) + +static const struct regmap_config tfp410_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + + .max_register = 0xff, + .cache_type = REGCACHE_NONE, +}; + struct tfp410 { struct drm_bridge bridge; struct drm_connector connector; @@ -33,6 +48,8 @@ struct tfp410 { struct drm_bridge *next_bridge; struct device *dev; + struct i2c_client *i2c; + struct regmap *regmap; }; static inline struct tfp410 * @@ -183,6 +200,9 @@ static void tfp410_enable(struct drm_bridge *bridge) { struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); + if (dvi->i2c) + regmap_set_bits(dvi->regmap, TFP410_REG_CTL_1_MODE, TFP410_BIT_PD); + gpiod_set_value_cansleep(dvi->powerdown, 0); } @@ -190,6 +210,9 @@ static void tfp410_disable(struct drm_bridge *bridge) { struct tfp410 *dvi = drm_bridge_to_tfp410(bridge); + if (dvi->i2c) + regmap_clear_bits(dvi->regmap, TFP410_REG_CTL_1_MODE, TFP410_BIT_PD); + gpiod_set_value_cansleep(dvi->powerdown, 1); } @@ -221,38 +244,48 @@ static const struct drm_bridge_timings tfp410_default_timings = { .hold_time_ps = 1300, }; -static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) +static int tfp410_parse_timings(struct tfp410 *dvi) { struct drm_bridge_timings *timings = &dvi->timings; struct device_node *ep; u32 pclk_sample = 0; u32 bus_width = 24; u32 deskew = 0; + unsigned int val = 0; + int ret = 0; /* Start with defaults. */ *timings = tfp410_default_timings; - if (i2c) + if (dvi->i2c) { /* - * In I2C mode timings are configured through the I2C interface. - * As the driver doesn't support I2C configuration yet, we just - * go with the defaults (BSEL=1, DSEL=1, DKEN=0, EDGE=1). + * For now, assume settings are latched from pins on reset / power up. + * Should add options to optionally set them out of DT properties. */ - return 0; - - /* - * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN - * and EDGE pins. They are specified in DT through endpoint properties - * and vendor-specific properties. - */ - ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); - if (!ep) - return -EINVAL; - - /* Get the sampling edge from the endpoint. */ - of_property_read_u32(ep, "pclk-sample", &pclk_sample); - of_property_read_u32(ep, "bus-width", &bus_width); - of_node_put(ep); + ret = regmap_read(dvi->regmap, TFP410_REG_CTL_1_MODE, &val); + if (ret) { + dev_err(dvi->dev, "Read failed on CTL_1_MODE\n"); + return ret; + } + pclk_sample = (val & TFP410_BIT_EDGE) ? 1 : 0; + bus_width = (val & TFP410_BIT_BSEL) ? 24 : 12; + dev_dbg(dvi->dev, "(0x%02X) : detected %d bus width, %s edge sampling\n", + val, bus_width, pclk_sample ? "positive" : "negative"); + } else { + /* + * In non-I2C mode, timings are configured through the BSEL, DSEL, DKEN + * and EDGE pins. They are specified in DT through endpoint properties + * and vendor-specific properties. + */ + ep = of_graph_get_endpoint_by_regs(dvi->dev->of_node, 0, 0); + if (!ep) + return -EINVAL; + + /* Get the sampling edge from the endpoint. */ + of_property_read_u32(ep, "pclk-sample", &pclk_sample); + of_property_read_u32(ep, "bus-width", &bus_width); + of_node_put(ep); + } timings->input_bus_flags = DRM_BUS_FLAG_DE_HIGH; @@ -291,7 +324,7 @@ static int tfp410_parse_timings(struct tfp410 *dvi, bool i2c) return 0; } -static int tfp410_init(struct device *dev, bool i2c) +static int tfp410_init(struct device *dev, struct i2c_client *i2c) { struct device_node *node; struct tfp410 *dvi; @@ -313,15 +346,24 @@ static int tfp410_init(struct device *dev, bool i2c) dvi->bridge.of_node = dev->of_node; dvi->bridge.timings = &dvi->timings; dvi->bridge.type = DRM_MODE_CONNECTOR_DVID; + dvi->i2c = i2c; + + if (i2c) { + dvi->regmap = devm_regmap_init_i2c(i2c, &tfp410_regmap_config); + if (IS_ERR(dvi->regmap)) + return PTR_ERR(dvi->regmap); + } - ret = tfp410_parse_timings(dvi, i2c); + ret = tfp410_parse_timings(dvi); if (ret) return ret; /* Get the next bridge, connected to port@1. */ node = of_graph_get_remote_node(dev->of_node, 1, -1); - if (!node) + if (!node) { + dev_err(dev, "Could not find remote node\n"); return -ENODEV; + } dvi->next_bridge = of_drm_find_bridge(node); of_node_put(node); @@ -352,7 +394,7 @@ static void tfp410_fini(struct device *dev) static int tfp410_probe(struct platform_device *pdev) { - return tfp410_init(&pdev->dev, false); + return tfp410_init(&pdev->dev, NULL); } static int tfp410_remove(struct platform_device *pdev) @@ -378,7 +420,6 @@ static struct platform_driver tfp410_platform_driver = { }; #if IS_ENABLED(CONFIG_I2C) -/* There is currently no i2c functionality. */ static int tfp410_i2c_probe(struct i2c_client *client, const struct i2c_device_id *id) { @@ -391,7 +432,7 @@ static int tfp410_i2c_probe(struct i2c_client *client, return -ENXIO; } - return tfp410_init(&client->dev, true); + return tfp410_init(&client->dev, client); } static void tfp410_i2c_remove(struct i2c_client *client)