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Tue, 18 Apr 2023 05:50:54 -0700 (PDT) Received: from fshao-glinux.tpe.corp.google.com ([2401:fa00:1:10:2fb7:301d:6083:752b]) by smtp.gmail.com with ESMTPSA id v11-20020a62a50b000000b0063afb08afeesm9323733pfm.67.2023.04.18.05.50.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 18 Apr 2023 05:50:54 -0700 (PDT) From: Fei Shao To: Benjamin Tissoires , Douglas Anderson , Rob Herring Subject: [PATCH 2/2] HID: i2c-hid: goodix: Add support for powered-in-suspend property Date: Tue, 18 Apr 2023 20:49:52 +0800 Message-ID: <20230418124953.3170028-3-fshao@chromium.org> X-Mailer: git-send-email 2.40.0.634.g4ca3ef3211-goog In-Reply-To: <20230418124953.3170028-1-fshao@chromium.org> References: <20230418124953.3170028-1-fshao@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230418_055058_916836_CB7285E5 X-CRM114-Status: GOOD ( 25.05 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Dmitry Torokhov , Stephen Kitt , Jiri Kosina , linux-kernel@vger.kernel.org, Matthias Kaehlcke , linux-mediatek , linux-input@vger.kernel.org Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org In the beginning, commit 18eeef46d359 ("HID: i2c-hid: goodix: Tie the reset line to true state of the regulator") introduced a change to tie the reset line of the Goodix touchscreen to the state of the regulator to fix a power leakage issue in suspend. After some time, the change was deemed unnecessary and was reverted in commit 557e05fa9fdd ("HID: i2c-hid: goodix: Stop tying the reset line to the regulator") due to difficulties in managing regulator notifiers for designs like Evoker, which provides a second power rail to touchscreen. However, the revert caused a power regression on another Chromebook device Steelix in the field, which has a dedicated always-on regulator for touchscreen and was covered by the workaround in the first commit. To address both cases, this patch adds the support for the `powered-in-suspend` property in the driver that allows the driver to determine whether the touchscreen is still powered in suspend, and handle the reset GPIO accordingly as below: - When set to true, the driver does not assert the reset GPIO in power down. To ensure a clean start and the consistent behavior, it does the assertion in power up instead. This is for designs with a dedicated always-on regulator. - When set to false, the driver uses the original control flow and asserts GPIO and disable regulators normally. This is for the two-regulator and shared-regulator designs. Signed-off-by: Fei Shao Reviewed-by: Douglas Anderson --- drivers/hid/i2c-hid/i2c-hid-of-goodix.c | 46 +++++++++++++++++++++---- 1 file changed, 39 insertions(+), 7 deletions(-) diff --git a/drivers/hid/i2c-hid/i2c-hid-of-goodix.c b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c index 0060e3dcd775..b438db8ca6f4 100644 --- a/drivers/hid/i2c-hid/i2c-hid-of-goodix.c +++ b/drivers/hid/i2c-hid/i2c-hid-of-goodix.c @@ -28,6 +28,7 @@ struct i2c_hid_of_goodix { struct regulator *vdd; struct regulator *vddio; struct gpio_desc *reset_gpio; + bool powered_in_suspend; const struct goodix_i2c_hid_timing_data *timings; }; @@ -37,13 +38,34 @@ static int goodix_i2c_hid_power_up(struct i2chid_ops *ops) container_of(ops, struct i2c_hid_of_goodix, ops); int ret; - ret = regulator_enable(ihid_goodix->vdd); - if (ret) - return ret; - - ret = regulator_enable(ihid_goodix->vddio); - if (ret) - return ret; + /* + * This is to ensure that the reset GPIO will be asserted and the + * regulators will be enabled for all cases. + */ + if (ihid_goodix->powered_in_suspend) { + /* + * This is not mandatory, but we assert reset here (instead of + * in power-down) to ensure that the device will have a clean + * state later on just like the normal scenarios would have. + * + * Also, since the regulators were not disabled in power-down, + * we don't need to enable them here. + */ + gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1); + } else { + /* + * In this case, the reset is already asserted (either in + * probe or power-down). + * All we need is to enable the regulators. + */ + ret = regulator_enable(ihid_goodix->vdd); + if (ret) + return ret; + + ret = regulator_enable(ihid_goodix->vddio); + if (ret) + return ret; + } if (ihid_goodix->timings->post_power_delay_ms) msleep(ihid_goodix->timings->post_power_delay_ms); @@ -60,6 +82,13 @@ static void goodix_i2c_hid_power_down(struct i2chid_ops *ops) struct i2c_hid_of_goodix *ihid_goodix = container_of(ops, struct i2c_hid_of_goodix, ops); + /* + * Don't assert reset GPIO or disable regulators if we're keeping the + * device powered in suspend. + */ + if (ihid_goodix->powered_in_suspend) + return; + gpiod_set_value_cansleep(ihid_goodix->reset_gpio, 1); regulator_disable(ihid_goodix->vddio); regulator_disable(ihid_goodix->vdd); @@ -91,6 +120,9 @@ static int i2c_hid_of_goodix_probe(struct i2c_client *client) if (IS_ERR(ihid_goodix->vddio)) return PTR_ERR(ihid_goodix->vddio); + ihid_goodix->powered_in_suspend = + of_property_read_bool(client->dev.of_node, "powered-in-suspend"); + ihid_goodix->timings = device_get_match_data(&client->dev); return i2c_hid_core_probe(client, &ihid_goodix->ops, 0x0001, 0);