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[209.132.180.67]) by mx.google.com with ESMTP id t8si5023639edd.373.2019.11.22.00.25.23; Fri, 22 Nov 2019 00:25:47 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726990AbfKVIYS (ORCPT + 99 others); Fri, 22 Nov 2019 03:24:18 -0500 Received: from esa2.mentor.iphmx.com ([68.232.141.98]:52461 "EHLO esa2.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725999AbfKVIYS (ORCPT ); Fri, 22 Nov 2019 03:24:18 -0500 IronPort-SDR: ffk80AX5qNTu76qq1DwjKBDA8G1NJs7tE581Y2F2oX9JXpgEIyZUca8M/VQdkqZtpH0OL5JQup mKsl70Cniv7WY5lFYFGcIUw51MeB/WYjQMrEkDToekkjWyH+TDaIPgf4XRtCa7yZNVrwVywoNu rc8aiwRqjmo56WSOFlDlDWLl4v2Qjz4bNQEPE+XCdk7MH/MKn/IKFVumWAIVNNZesMsXeVQS+8 /T1bQDrU/mM+hln3TPcfiq9eOBR8bJ94ddTSwFtw26d4GPiIgR/6lpIlXhLYdVedmL0z+BWcZX QpE= X-IronPort-AV: E=Sophos;i="5.69,229,1571731200"; d="scan'208";a="43358886" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa2.mentor.iphmx.com with ESMTP; 22 Nov 2019 00:24:17 -0800 IronPort-SDR: mBWLPye+yE7F4JJ5/wifG0vsFEaxac2qQ06vNw+XCA2pXOIQWhi8jb3R3rLsqLjfNKV5pa+vxM yupjmC8tr9L64wQ54fhKSYwKUcRERQZt6mVarsodNri2zhr5ke7LmJX9txU24dvXh//zmuaK9k a0xQJuL3aN+CJo4ZrCLip5TV4mN4lO+PTJ62PfiOAzNbNidmquiipifE/WGRHa8kB06PucdNhZ 3lv5JDVUNuggAJ/HEqVRERsHT+xHbQiXS5A8vf47YnFoB5BI0awdYS48bvGazrEHwrDsEsMeZG 27w= From: Jiada Wang To: , , , , CC: , , , , Subject: [PATCH v6 03/48] Input: atmel_mxt_ts - only read messages in mxt_acquire_irq() when necessary Date: Fri, 22 Nov 2019 17:23:17 +0900 Message-ID: <20191122082402.18173-4-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191122082402.18173-1-jiada_wang@mentor.com> References: <20191122082402.18173-1-jiada_wang@mentor.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nick Dyer The workaround of reading all messages until an invalid is received is a way of forcing the CHG line high, which means that when using edge-triggered interrupts the interrupt can be acquired. With level-triggered interrupts the workaround is unnecessary. Also, most recent maXTouch chips have a feature called RETRIGEN which, when enabled, reasserts the interrupt line every cycle if there are messages waiting. This also makes the workaround unnecessary. Note: the RETRIGEN feature is only in some firmware versions/chips, it's not valid simply to enable the bit. Signed-off-by: Nick Dyer Acked-by: Benson Leung Acked-by: Yufeng Shen (cherry picked from ndyer/linux/for-upstream commit 1ae4e8281e491b22442cd5acdfca1862555f8ecb) [gdavis: Fix conflicts due to v4.6-rc7 commit eb43335c4095 ("Input: atmel_mxt_ts - use mxt_acquire_irq in mxt_soft_reset").] Signed-off-by: George G. Davis [jiada: reset use_retrigen_workaround at beginning of mxt_check_retrigen()] Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 51 ++++++++++++++++++++++-- 1 file changed, 48 insertions(+), 3 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index ffe8a80f4d0a..ce5a069b62d4 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -20,6 +20,7 @@ #include #include #include +#include #include #include #include @@ -129,6 +130,7 @@ struct t9_range { /* MXT_SPT_COMMSCONFIG_T18 */ #define MXT_COMMS_CTRL 0 #define MXT_COMMS_CMD 1 +#define MXT_COMMS_RETRIGEN BIT(6) /* MXT_DEBUG_DIAGNOSTIC_T37 */ #define MXT_DIAGNOSTIC_PAGEUP 0x01 @@ -308,6 +310,7 @@ struct mxt_data { struct t7_config t7_cfg; struct mxt_dbg dbg; struct gpio_desc *reset_gpio; + bool use_retrigen_workaround; /* Cached parameters from object table */ u16 T5_address; @@ -318,6 +321,7 @@ struct mxt_data { u16 T71_address; u8 T9_reportid_min; u8 T9_reportid_max; + u16 T18_address; u8 T19_reportid; u16 T44_address; u8 T100_reportid_min; @@ -1190,9 +1194,11 @@ static int mxt_acquire_irq(struct mxt_data *data) enable_irq(data->irq); - error = mxt_process_messages_until_invalid(data); - if (error) - return error; + if (data->use_retrigen_workaround) { + error = mxt_process_messages_until_invalid(data); + if (error) + return error; + } return 0; } @@ -1282,6 +1288,33 @@ static u32 mxt_calculate_crc(u8 *base, off_t start_off, off_t end_off) return crc; } +static int mxt_check_retrigen(struct mxt_data *data) +{ + struct i2c_client *client = data->client; + int error; + int val; + + data->use_retrigen_workaround = false; + + if (irq_get_trigger_type(data->irq) & IRQF_TRIGGER_LOW) + return 0; + + if (data->T18_address) { + error = __mxt_read_reg(client, + data->T18_address + MXT_COMMS_CTRL, + 1, &val); + if (error) + return error; + + if (val & MXT_COMMS_RETRIGEN) + return 0; + } + + dev_warn(&client->dev, "Enabling RETRIGEN workaround\n"); + data->use_retrigen_workaround = true; + return 0; +} + static int mxt_prepare_cfg_mem(struct mxt_data *data, struct mxt_cfg *cfg) { struct device *dev = &data->client->dev; @@ -1561,6 +1594,10 @@ static int mxt_update_cfg(struct mxt_data *data, const struct firmware *fw) mxt_update_crc(data, MXT_COMMAND_BACKUPNV, MXT_BACKUP_VALUE); + ret = mxt_check_retrigen(data); + if (ret) + goto release_mem; + ret = mxt_soft_reset(data); if (ret) goto release_mem; @@ -1604,6 +1641,7 @@ static void mxt_free_object_table(struct mxt_data *data) data->T71_address = 0; data->T9_reportid_min = 0; data->T9_reportid_max = 0; + data->T18_address = 0; data->T19_reportid = 0; data->T44_address = 0; data->T100_reportid_min = 0; @@ -1678,6 +1716,9 @@ static int mxt_parse_object_table(struct mxt_data *data, object->num_report_ids - 1; data->num_touchids = object->num_report_ids; break; + case MXT_SPT_COMMSCONFIG_T18: + data->T18_address = object->start_address; + break; case MXT_SPT_MESSAGECOUNT_T44: data->T44_address = object->start_address; break; @@ -2141,6 +2182,10 @@ static int mxt_initialize(struct mxt_data *data) msleep(MXT_FW_RESET_TIME); } + error = mxt_check_retrigen(data); + if (error) + return error; + error = mxt_acquire_irq(data); if (error) return error; -- 2.17.1