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[72.90.70.109]) by smtp.gmail.com with ESMTPSA id ek3-20020a05622a4fc300b003b68ea3d5c8sm1505678qtb.41.2023.01.26.14.40.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Jan 2023 14:40:51 -0800 (PST) From: Jonathan Cormier Date: Thu, 26 Jan 2023 17:40:45 -0500 Subject: [PATCH v2 4/4] drm/bridge: tfp410: If connected, use I2C for polled HPD status. MIME-Version: 1.0 Message-Id: <20230125-tfp410_i2c-v2-4-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=1511; i=jcormier@criticallink.com; h=from:subject:message-id; bh=mnMRLzTQ5OvUKpoF4H4mdtxVS/UwcOVTBoA/DdsbVck=; b=owEBbQKS/ZANAwAKAdzX/S4LNuuqAcsmYgBj0wFuvXkSsXrMPuQIuaE7dqR3P3ABer3/DA77uFMa Kse6bIOJAjMEAAEKAB0WIQT/MozqCeZtYxNnVN/c1/0uCzbrqgUCY9MBbgAKCRDc1/0uCzbrqjH0EA CuMWARBsza9msRcHworH1ssy/nFvqzq4JbkaBvAIl0CJb4diN58Mnla1QqnkkqHuSAj/Wta4K9JmJB XPBdPdsr66l2JKinBGdLAJRJHN6r0BM66hlL5RuizDJHFhfU9WgWiQsz4KoidZh/rUcm2yvODPTR2y TS+c4JA5a8mNj6EELvH+dZG3MRdgAot6HEH9yDLjUXz7kMYb5Acz1YmpfKYHnyZUP9OsKopq+iAOs/ oEB8kr36y6xylEkJfTZyHcAwKpD/5T3Nlk5FcMGQh5BrXqF9X51He1ns5V5fujw/N7Ybrhn+sAdwcB iA/w6dhTfeuyRRlyGJo7liNOUEVeu9Qx1EVE11AriFjxFxEC9muC2aVQPZT8OmU7ho9okGhDRkmA6K PI9f71y0dUHpZHPzyEoYlwAz/kEVd2U7VnPtJmA//l9AS2z/zk9gLghAMllvkkPgr5ye6khJd+v4O0 V89ebxTpges+Kbd/oyShBYwRpSh4gYTM4w+RpKg1tB/3FlTempzoX//3/QMAthGRmygseCSDjWM6UD uUoHgcxV86Dzfnn2WEyQcRS89AXv4DIF45hiPtOpLd/X/ZSgTOhpkF/50WLKHDT7X1MTEKSYjDxii2 ivTCGpZLsW6Qv3lF7PR3bbLSzeHEOmUh2MfoYtbMteNMElwBVsJsqY+PIP3g== 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=unavailable 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?1756127518432538964?= X-GMAIL-MSGID: =?utf-8?q?1756127518432538964?= From: Michael Williamson If the I2C bus is connected on the TFP410, then use the register status bit to determine connection state. This is needed, in particular, for polling the state when the Hot Plug detect is not connected to a controlling CPU via GPIO/IRQ lane. Signed-off-by: Michael Williamson Signed-off-by: Jonathan Cormier --- drivers/gpu/drm/bridge/ti-tfp410.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/drivers/gpu/drm/bridge/ti-tfp410.c b/drivers/gpu/drm/bridge/ti-tfp410.c index 41007d05d584..eeb7202452aa 100644 --- a/drivers/gpu/drm/bridge/ti-tfp410.c +++ b/drivers/gpu/drm/bridge/ti-tfp410.c @@ -28,6 +28,9 @@ #define TFP410_BIT_BSEL BIT(2) #define TFP410_BIT_DSEL BIT(3) +#define TFP410_REG_CTL_2_MODE 0x09 +#define TFP410_BIT_HTPLG BIT(1) + static const struct regmap_config tfp410_regmap_config = { .reg_bits = 8, .val_bits = 8, @@ -105,6 +108,15 @@ static enum drm_connector_status tfp410_connector_detect(struct drm_connector *connector, bool force) { struct tfp410 *dvi = drm_connector_to_tfp410(connector); + int ret; + + if (dvi->i2c) { + ret = regmap_test_bits(dvi->regmap, TFP410_REG_CTL_2_MODE, TFP410_BIT_HTPLG); + if (ret < 0) + dev_err(dvi->dev, "%s failed to read HTPLG bit : %d\n", __func__, ret); + else + return ret ? connector_status_connected : connector_status_disconnected; + } return drm_bridge_detect(dvi->next_bridge); }