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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add a DT binding documentation for the MT8195 soc. Signed-off-by: Kewei Xu --- Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt index 7f0194f..7c4915bc 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt @@ -15,6 +15,7 @@ Required properties: "mediatek,mt8173-i2c": for MediaTek MT8173 "mediatek,mt8183-i2c": for MediaTek MT8183 "mediatek,mt8192-i2c": for MediaTek MT8192 + "mediatek,mt8195-i2c", "mediatek,mt8192-i2c": for MediaTek MT8195 "mediatek,mt8516-i2c", "mediatek,mt2712-i2c": for MediaTek MT8516 - reg: physical base address of the controller and dma base, length of memory mapped region. From patchwork Thu Jul 15 02:29:11 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378307 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id E9238C47E4B for ; Thu, 15 Jul 2021 02:33:41 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B48EE613CF for ; Thu, 15 Jul 2021 02:33:41 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B48EE613CF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=Vmi7HKo6sJQf+75JMaQCG9iLPy7AsfUfqukNzA7IEYs=; b=GyKd2AU7FjpkMJ RR77FARHFi47IRtQ0b5VVQGkYvaK/7D98gfMnsCUMkQ0cGAr7CVODVsGv0hq5yBypBmBP628zGqk/ Zwq66LlH70Qx36U4Ce86X+mX8zdCZVpbXynHFEF4PN6llAucCiRrwMCNe8LPeOP7KOp6r4Etx2b0y BTrzeNkzrHswMIWzuuT7SCXcZVqcF4vPQkRYNxbrTPAPDRyDf2mUKnEDl9lYKTQLW2qHudxZr9erY KDBL+zlqUn4J2wW/HObuZsQTg3VyRFrTHsL6GabiAFJGdeKGJFLPwHBoCbBeGOOq6hbYVJnXkeuY3 Fd+w4LE2mB4ETlsBd89Q==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3r9B-00Gqzm-Aj; Thu, 15 Jul 2021 02:30:45 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3r8l-00Gqsm-UH; Thu, 15 Jul 2021 02:30:21 +0000 X-UUID: 6969ea85730d4e6f80c8d486b84088ea-20210714 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=+Qpvl5HPHbgSQRzAohnu4qgapn/1mkQEuNzYaSVbsS0=; b=BvquZNDD4tM4bVKGX+gEhx1wl8J3fufsZPYaRat5lxdMxLx+Dk5JnEZ3F+LI/WZFgTblgioXo+Doa3tgPHovLxjWkRClxSHBQixLiEI0mSQmtn6EBaegruKWVi71FJorh+iNkhyxQwP8D4k1Rd8jyOUxej4wxnxe3owGj9YPf6w=; X-UUID: 6969ea85730d4e6f80c8d486b84088ea-20210714 Received: from mtkcas67.mediatek.inc [(172.29.193.45)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 554888254; Wed, 14 Jul 2021 19:30:13 -0700 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N2.mediatek.inc (172.29.193.42) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 19:30:12 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 15 Jul 2021 10:30:10 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 15 Jul 2021 10:30:10 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 2/8] i2c: mediatek: Dump i2c/dma register when a timeout occurs Date: Thu, 15 Jul 2021 10:29:11 +0800 Message-ID: <1626316157-24935-3-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193020_012519_8DD3CEEB X-CRM114-Status: GOOD ( 13.24 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When a timeout error occurs in i2c transter, it is usually related to the i2c/dma IP hardware configuration. Therefore, the purpose of this patch is to dump the key register values of i2c/dma when a timeout occurs in i2c for debugging. Signed-off-by: Kewei Xu --- drivers/i2c/busses/i2c-mt65xx.c | 95 ++++++++++++++++++++++++++++++++++++++++- 1 file changed, 94 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 5ddfa4e..64acd96 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -125,6 +125,7 @@ enum I2C_REGS_OFFSET { OFFSET_HS, OFFSET_SOFTRESET, OFFSET_DCM_EN, + OFFSET_MULTI_DMA, OFFSET_PATH_DIR, OFFSET_DEBUGSTAT, OFFSET_DEBUGCTRL, @@ -192,6 +193,7 @@ enum I2C_REGS_OFFSET { [OFFSET_TRANSFER_LEN_AUX] = 0x44, [OFFSET_CLOCK_DIV] = 0x48, [OFFSET_SOFTRESET] = 0x50, + [OFFSET_MULTI_DMA] = 0x84, [OFFSET_SCL_MIS_COMP_POINT] = 0x90, [OFFSET_DEBUGSTAT] = 0xe0, [OFFSET_DEBUGCTRL] = 0xe8, @@ -828,6 +830,96 @@ static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk) return 0; } +static void i2c_dump_register(struct mtk_i2c *i2c) +{ + dev_err(i2c->dev, "SLAVE_ADDR[0x%x]: 0x%x, INTR_MASK[0x%x]: 0x%x\n", + OFFSET_SLAVE_ADDR, + (mtk_i2c_readw(i2c, OFFSET_SLAVE_ADDR)), + OFFSET_INTR_MASK, + (mtk_i2c_readw(i2c, OFFSET_INTR_MASK))); + dev_err(i2c->dev, "INTR_STAT[0x%x]: 0x%x, CONTROL[0x%x]: 0x%x\n", + OFFSET_INTR_STAT, + (mtk_i2c_readw(i2c, OFFSET_INTR_STAT)), + OFFSET_CONTROL, + (mtk_i2c_readw(i2c, OFFSET_CONTROL))); + dev_err(i2c->dev, "TRANSFER_LEN[0x%x]: 0x%x, TRANSAC_LEN[0x%x]: 0x%x\n", + OFFSET_TRANSFER_LEN, + (mtk_i2c_readw(i2c, OFFSET_TRANSFER_LEN)), + OFFSET_TRANSAC_LEN, + (mtk_i2c_readw(i2c, OFFSET_TRANSAC_LEN))); + dev_err(i2c->dev, "DELAY_LEN[0x%x]: 0x%x, HTIMING[0x%x]: 0x%x\n", + OFFSET_DELAY_LEN, + (mtk_i2c_readw(i2c, OFFSET_DELAY_LEN)), + OFFSET_TIMING, + (mtk_i2c_readw(i2c, OFFSET_TIMING))); + dev_err(i2c->dev, "OFFSET_START[0x%x]: 0x%x\n", + OFFSET_START, + mtk_i2c_readw(i2c, OFFSET_START)); + dev_err(i2c->dev, "OFFSET_EXT_CONF[0x%x]: 0x%x\n", + OFFSET_EXT_CONF, + mtk_i2c_readw(i2c, OFFSET_EXT_CONF)); + dev_err(i2c->dev, "OFFSET_HS[0x%x]: 0x%x\n", + OFFSET_HS, + mtk_i2c_readw(i2c, OFFSET_HS)); + dev_err(i2c->dev, "OFFSET_IO_CONFIG[0x%x]: 0x%x\n", + OFFSET_IO_CONFIG, + mtk_i2c_readw(i2c, OFFSET_IO_CONFIG)); + dev_err(i2c->dev, "OFFSET_FIFO_ADDR_CLR[0x%x]: 0x%x\n", + OFFSET_FIFO_ADDR_CLR, + mtk_i2c_readw(i2c, OFFSET_FIFO_ADDR_CLR)); + dev_err(i2c->dev, "TRANSFER_LEN_AUX[0x%x]: 0x%x\n", + OFFSET_TRANSFER_LEN_AUX, + mtk_i2c_readw(i2c, OFFSET_TRANSFER_LEN_AUX)); + dev_err(i2c->dev, "CLOCK_DIV[0x%x]: 0x%x\n", + OFFSET_CLOCK_DIV, + mtk_i2c_readw(i2c, OFFSET_CLOCK_DIV)); + dev_err(i2c->dev, "FIFO_STAT[0x%x]: 0x%x, FIFO_THRESH[0x%x]: 0x%x\n", + OFFSET_FIFO_STAT, + mtk_i2c_readw(i2c, OFFSET_FIFO_STAT), + OFFSET_FIFO_THRESH, + mtk_i2c_readw(i2c, OFFSET_FIFO_THRESH)); + dev_err(i2c->dev, "DCM_EN[0x%x] 0x%x\n", + OFFSET_DCM_EN, + mtk_i2c_readw(i2c, OFFSET_DCM_EN)); + dev_err(i2c->dev, "DEBUGSTAT[0x%x]: 0x%x, DEBUGCTRL[0x%x]: 0x%x\n", + OFFSET_DEBUGSTAT, + (mtk_i2c_readw(i2c, OFFSET_DEBUGSTAT)), + OFFSET_DEBUGCTRL, + (mtk_i2c_readw(i2c, OFFSET_DEBUGCTRL))); + + if (i2c->dev_comp->regs == mt_i2c_regs_v2) { + dev_err(i2c->dev, "OFFSET_LTIMING[0x%x]: 0x%x\n", + OFFSET_LTIMING, + mtk_i2c_readw(i2c, OFFSET_LTIMING)); + dev_err(i2c->dev, "MULTI_DMA[0x%x]: 0x%x\n", + OFFSET_MULTI_DMA, + (mtk_i2c_readw(i2c, OFFSET_MULTI_DMA))); + } + + dev_err(i2c->dev, "OFFSET_INT_FLAG = 0x%x\n", + readl(i2c->pdmabase + OFFSET_INT_FLAG)); + dev_err(i2c->dev, "OFFSET_INT_EN = 0x%x\n", + readl(i2c->pdmabase + OFFSET_INT_EN)); + dev_err(i2c->dev, "OFFSET_EN = 0x%x\n", + readl(i2c->pdmabase + OFFSET_EN)); + dev_err(i2c->dev, "OFFSET_RST = 0x%x\n", + readl(i2c->pdmabase + OFFSET_RST)); + dev_err(i2c->dev, "OFFSET_CON = 0x%x\n", + readl(i2c->pdmabase + OFFSET_CON)); + dev_err(i2c->dev, "OFFSET_TX_MEM_ADDR = 0x%x\n", + readl(i2c->pdmabase + OFFSET_TX_MEM_ADDR)); + dev_err(i2c->dev, "OFFSET_RX_MEM_ADDR = 0x%x\n", + readl(i2c->pdmabase + OFFSET_RX_MEM_ADDR)); + dev_err(i2c->dev, "OFFSET_TX_LEN = 0x%x\n", + readl(i2c->pdmabase + OFFSET_TX_LEN)); + dev_err(i2c->dev, "OFFSET_RX_LEN = 0x%x\n", + readl(i2c->pdmabase + OFFSET_RX_LEN)); + dev_err(i2c->dev, "OFFSET_TX_4G_MODE = 0x%x\n", + readl(i2c->pdmabase + OFFSET_TX_4G_MODE)); + dev_err(i2c->dev, "OFFSET_RX_4G_MODE = 0x%x\n", + readl(i2c->pdmabase + OFFSET_RX_4G_MODE)); +} + static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, int num, int left_num) { @@ -1034,7 +1126,8 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, } if (ret == 0) { - dev_dbg(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr); + dev_err(i2c->dev, "addr: %x, transfer timeout\n", msgs->addr); + i2c_dump_register(i2c); mtk_i2c_init_hw(i2c); return -ETIMEDOUT; } From patchwork Thu Jul 15 02:29:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378303 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B6717C1B08C for ; 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Thu, 15 Jul 2021 10:30:10 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 3/8] i2c: mediatek: fixing the incorrect register offset Date: Thu, 15 Jul 2021 10:29:12 +0800 Message-ID: <1626316157-24935-4-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193018_568310_9ED57C34 X-CRM114-Status: GOOD ( 10.94 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The reason for the modification here is that the previous offset information is incorrect, OFFSET_DEBUGSTAT = 0xE4 is the correct value. Signed-off-by: Kewei Xu Reviewed-by: Chen-Yu Tsai --- drivers/i2c/busses/i2c-mt65xx.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 64acd96..e65a41e 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -195,7 +195,7 @@ enum I2C_REGS_OFFSET { [OFFSET_SOFTRESET] = 0x50, [OFFSET_MULTI_DMA] = 0x84, [OFFSET_SCL_MIS_COMP_POINT] = 0x90, - [OFFSET_DEBUGSTAT] = 0xe0, + [OFFSET_DEBUGSTAT] = 0xe4, [OFFSET_DEBUGCTRL] = 0xe8, [OFFSET_FIFO_STAT] = 0xf4, [OFFSET_FIFO_THRESH] = 0xf8, From patchwork Thu Jul 15 02:29:13 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378305 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4DC3EC47E4D for ; 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Thu, 15 Jul 2021 10:30:11 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 4/8] i2c: mediatek: Reset the handshake signal between i2c and dma Date: Thu, 15 Jul 2021 10:29:13 +0800 Message-ID: <1626316157-24935-5-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193022_794234_B0A33D4B X-CRM114-Status: GOOD ( 10.58 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Due to changes in the hardware design of the handshaking signal between i2c and dma, it is necessary to reset the handshaking signal before each transfer to ensure that the multi-msgs can be transferred correctly. Signed-off-by: Kewei Xu --- drivers/i2c/busses/i2c-mt65xx.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index e65a41e..ded94f9 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -47,6 +47,9 @@ #define I2C_RD_TRANAC_VALUE 0x0001 #define I2C_SCL_MIS_COMP_VALUE 0x0000 #define I2C_CHN_CLR_FLAG 0x0000 +#define I2C_CLR_DEBUGCTR 0x0000 +#define I2C_RELIABILITY 0x0010 +#define I2C_DMAACK_ENABLE 0x0008 #define I2C_DMA_CON_TX 0x0000 #define I2C_DMA_CON_RX 0x0001 @@ -942,6 +945,17 @@ static int mtk_i2c_do_transfer(struct mtk_i2c *i2c, struct i2c_msg *msgs, reinit_completion(&i2c->msg_complete); + if (i2c->dev_comp->apdma_sync) { + mtk_i2c_writew(i2c, I2C_CLR_DEBUGCTR, OFFSET_DEBUGCTRL); + writel(I2C_DMA_HANDSHAKE_RST | I2C_DMA_WARM_RST, + i2c->pdmabase + OFFSET_RST); + writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST); + mtk_i2c_writew(i2c, I2C_HANDSHAKE_RST, OFFSET_SOFTRESET); + mtk_i2c_writew(i2c, I2C_CHN_CLR_FLAG, OFFSET_SOFTRESET); + mtk_i2c_writew(i2c, I2C_RELIABILITY | I2C_DMAACK_ENABLE, + OFFSET_DEBUGCTRL); + } + control_reg = mtk_i2c_readw(i2c, OFFSET_CONTROL) & ~(I2C_CONTROL_DIR_CHANGE | I2C_CONTROL_RS); if ((i2c->speed_hz > I2C_MAX_FAST_MODE_PLUS_FREQ) || (left_num >= 1)) From patchwork Thu Jul 15 02:29:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378309 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 05382C12002 for ; 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Thu, 15 Jul 2021 10:30:12 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 5/8] i2c: mediatek: Add OFFSET_EXT_CONF setting back Date: Thu, 15 Jul 2021 10:29:14 +0800 Message-ID: <1626316157-24935-6-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193026_267069_FB6300F8 X-CRM114-Status: GOOD ( 10.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), we miss setting OFFSET_EXT_CONF register if i2c->dev_comp->timing_adjust is false, now add it back. Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support") Signed-off-by: Kewei Xu --- drivers/i2c/busses/i2c-mt65xx.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index ded94f9..fe3cea7 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -41,6 +41,8 @@ #define I2C_HANDSHAKE_RST 0x0020 #define I2C_FIFO_ADDR_CLR 0x0001 #define I2C_DELAY_LEN 0x0002 +#define I2C_ST_START_CON 0x8001 +#define I2C_FS_START_CON 0x1800 #define I2C_TIME_CLR_VALUE 0x0000 #define I2C_TIME_DEFAULT_VALUE 0x0003 #define I2C_WRRD_TRANAC_VALUE 0x0002 @@ -484,6 +486,7 @@ static void mtk_i2c_clock_disable(struct mtk_i2c *i2c) static void mtk_i2c_init_hw(struct mtk_i2c *i2c) { u16 control_reg; + u16 ext_conf_val; if (i2c->dev_comp->apdma_sync) { writel(I2C_DMA_WARM_RST, i2c->pdmabase + OFFSET_RST); @@ -518,8 +521,13 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) if (i2c->dev_comp->ltiming_adjust) mtk_i2c_writew(i2c, i2c->ltiming_reg, OFFSET_LTIMING); + if (i2c->speed_hz <= I2C_MAX_STANDARD_MODE_FREQ) + ext_conf_val = I2C_ST_START_CON; + else + ext_conf_val = I2C_FS_START_CON; + if (i2c->dev_comp->timing_adjust) { - mtk_i2c_writew(i2c, i2c->ac_timing.ext, OFFSET_EXT_CONF); + ext_conf_val = i2c->ac_timing.ext; mtk_i2c_writew(i2c, i2c->ac_timing.inter_clk_div, OFFSET_CLOCK_DIV); mtk_i2c_writew(i2c, I2C_SCL_MIS_COMP_VALUE, @@ -544,6 +552,7 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) OFFSET_HS_STA_STO_AC_TIMING); } } + mtk_i2c_writew(i2c, ext_conf_val, OFFSET_EXT_CONF); /* If use i2c pin from PMIC mt6397 side, need set PATH_DIR first */ if (i2c->have_pmic) From patchwork Thu Jul 15 02:29:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378299 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5F15BC12002 for ; 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Thu, 15 Jul 2021 10:30:13 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 6/8] dt-bindings: i2c: add attribute default-timing-adjust Date: Thu, 15 Jul 2021 10:29:15 +0800 Message-ID: <1626316157-24935-7-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193022_799444_1D05526F X-CRM114-Status: UNSURE ( 8.99 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add attribute default-timing-adjust for DT-binding document. Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support") Signed-off-by: Kewei Xu --- Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt | 2 ++ 1 file changed, 2 insertions(+) diff --git a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt index 7c4915bc..7b80a11 100644 --- a/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt +++ b/Documentation/devicetree/bindings/i2c/i2c-mt65xx.txt @@ -33,6 +33,8 @@ Optional properties: - mediatek,have-pmic: platform can control i2c form special pmic side. Only mt6589 and mt8135 support this feature. - mediatek,use-push-pull: IO config use push-pull mode. + - mediatek,default-timing-adjust: use default timing calculation, no timing + adjustment. Example: From patchwork Thu Jul 15 02:29:16 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378311 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8AF0AC47E48 for ; Thu, 15 Jul 2021 02:33:50 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4C7ED613CF for ; Thu, 15 Jul 2021 02:33:50 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4C7ED613CF Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=mediatek.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lx2bmOklLikVKqHisNN/nbhwUr9Lcdm66G2rTaN6oeQ=; b=Qzypg7r89hLQ7+ P+f/iIHNz/wzOkg3lv+G96IMHPEueCOExJJ+M4MzDDkL0JHDUIIB9dEgDBwzT4EAW/ly35/3623f+ fqCYYefgmZhji6H8uuHzLQpzROKHY585aIxqpMstjZPzsVdLnbe1cFucT/GfAuBINNYRgKR2FrPQJ fPZR/dD69Lq9qWxf2IkKr54aWXJM8ft34bTKhLse6XVmSJxiMLjncCQp+EJEUNnDqxHGBTaNcAK9N 9Is0SeDzQJ2da4MzFgMnLxre42Vj7zatKTXTCyxzBYG2zrZVbgQ7W8PBWe/J6PRtalTdBvPwcGUUt IGM49BFgOburEdgbDuDA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3rA6-00GrRS-Gi; Thu, 15 Jul 2021 02:31:42 +0000 Received: from mailgw01.mediatek.com ([216.200.240.184]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1m3r8s-00Gqwo-W0; Thu, 15 Jul 2021 02:30:28 +0000 X-UUID: 5ac6d6093fee40dd8286ed10773b95c5-20210714 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=mediatek.com; s=dk; h=Content-Transfer-Encoding:Content-Type:MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:CC:To:From; bh=/Tg+6qIq/Qax7QEY0RIfSRjFg5b238irl9R4Cib5jmM=; b=QHiwuohoAQ9GwxPJu3JThFf2JINLCNCvkj7da3nOnrLGAgNTfoze6ZCs3Cz2PDUYVqHKm8IRDJtekpHpH535OruIne/Q8ql5fbVvn7WLF/mub86fxolcg0f5FLD6rR2BrbDNI8Spq+ixQzK6edVLS4IldwOsJ2iC0QFV4Sb0HIs=; X-UUID: 5ac6d6093fee40dd8286ed10773b95c5-20210714 Received: from mtkcas67.mediatek.inc [(172.29.193.45)] by mailgw01.mediatek.com (envelope-from ) (musrelay.mediatek.com ESMTP with TLSv1.2 ECDHE-RSA-AES256-SHA384 256/256) with ESMTP id 460172323; Wed, 14 Jul 2021 19:30:23 -0700 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 19:30:22 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 15 Jul 2021 10:30:15 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 15 Jul 2021 10:30:14 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 7/8] i2c: mediatek: Isolate speed setting via dts for special devices Date: Thu, 15 Jul 2021 10:29:16 +0800 Message-ID: <1626316157-24935-8-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193027_094878_1BFEE677 X-CRM114-Status: GOOD ( 19.06 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In the commit be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support"), the I2C timing calculation has been revised to support ac-timing adjustment, however that will break on some I2C components. As a result we want to introduce a new setting "default-adjust-timing" so those components can choose to use the old (default) timing algorithm. Fixes: be5ce0e97cc7 ("i2c: mediatek: Add i2c ac-timing adjust support") Signed-off-by: Kewei Xu --- drivers/i2c/busses/i2c-mt65xx.c | 75 ++++++++++++++++++++++++++++++++++++++--- 1 file changed, 71 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index fe3cea7..486076f 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -65,6 +65,7 @@ #define I2C_DMA_HARD_RST 0x0002 #define I2C_DMA_HANDSHAKE_RST 0x0004 +#define I2C_DEFAULT_CLK_DIV 5 #define MAX_SAMPLE_CNT_DIV 8 #define MAX_STEP_CNT_DIV 64 #define MAX_CLOCK_DIV 256 @@ -249,6 +250,7 @@ struct mtk_i2c { struct clk *clk_arb; /* Arbitrator clock for i2c */ bool have_pmic; /* can use i2c pins from PMIC */ bool use_push_pull; /* IO config push-pull mode */ + bool default_timing_adjust; /* no timing adjust mode */ u16 irq_stat; /* interrupt status */ unsigned int clk_src_div; @@ -526,7 +528,11 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) else ext_conf_val = I2C_FS_START_CON; - if (i2c->dev_comp->timing_adjust) { + if (i2c->default_timing_adjust) { + if (i2c->dev_comp->timing_adjust) + mtk_i2c_writew(i2c, I2C_DEFAULT_CLK_DIV - 1, + OFFSET_CLOCK_DIV); + } else if (i2c->dev_comp->timing_adjust) { ext_conf_val = i2c->ac_timing.ext; mtk_i2c_writew(i2c, i2c->ac_timing.inter_clk_div, OFFSET_CLOCK_DIV); @@ -609,7 +615,7 @@ static int mtk_i2c_check_ac_timing(struct mtk_i2c *i2c, unsigned int sample_ns = div_u64(1000000000ULL * (sample_cnt + 1), clk_src); - if (!i2c->dev_comp->timing_adjust) + if (i2c->default_timing_adjust || !i2c->dev_comp->timing_adjust) return 0; if (i2c->dev_comp->ltiming_adjust) @@ -769,7 +775,63 @@ static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src, return 0; } -static int mtk_i2c_set_speed(struct mtk_i2c *i2c, unsigned int parent_clk) +static int mtk_i2c_set_speed_default_timing(struct mtk_i2c *i2c, unsigned int parent_clk) +{ + unsigned int clk_src; + unsigned int step_cnt; + unsigned int sample_cnt; + unsigned int l_step_cnt; + unsigned int l_sample_cnt; + unsigned int target_speed; + int ret; + + if (i2c->dev_comp->timing_adjust) + i2c->clk_src_div *= I2C_DEFAULT_CLK_DIV; + + clk_src = parent_clk / i2c->clk_src_div; + target_speed = i2c->speed_hz; + + if (target_speed > I2C_MAX_FAST_MODE_PLUS_FREQ) { + /* Set master code speed register */ + ret = mtk_i2c_calculate_speed(i2c, clk_src, I2C_MAX_FAST_MODE_FREQ, + &l_step_cnt, &l_sample_cnt); + if (ret < 0) + return ret; + + i2c->timing_reg = (l_sample_cnt << 8) | l_step_cnt; + + /* Set the high speed mode register */ + ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed, + &step_cnt, &sample_cnt); + if (ret < 0) + return ret; + + i2c->high_speed_reg = I2C_TIME_DEFAULT_VALUE | + (sample_cnt << 12) | (step_cnt << 8); + + if (i2c->dev_comp->ltiming_adjust) + i2c->ltiming_reg = (l_sample_cnt << 6) | l_step_cnt | + (sample_cnt << 12) | (step_cnt << 9); + } else { + ret = mtk_i2c_calculate_speed(i2c, clk_src, target_speed, + &step_cnt, &sample_cnt); + if (ret < 0) + return ret; + + i2c->timing_reg = (sample_cnt << 8) | step_cnt; + + /* Disable the high speed transaction */ + i2c->high_speed_reg = I2C_TIME_CLR_VALUE; + + if (i2c->dev_comp->ltiming_adjust) + i2c->ltiming_reg = (sample_cnt << 6) | step_cnt; + } + + return 0; +} + +static int mtk_i2c_set_speed_adjust_timing(struct mtk_i2c *i2c, + unsigned int parent_clk) { unsigned int clk_src; unsigned int step_cnt; @@ -1293,6 +1355,8 @@ static int mtk_i2c_parse_dt(struct device_node *np, struct mtk_i2c *i2c) i2c->have_pmic = of_property_read_bool(np, "mediatek,have-pmic"); i2c->use_push_pull = of_property_read_bool(np, "mediatek,use-push-pull"); + i2c->default_timing_adjust = + of_property_read_bool(np, "mediatek,default-timing-adjust"); i2c_parse_fw_timings(i2c->dev, &i2c->timing_info, true); @@ -1372,7 +1436,10 @@ static int mtk_i2c_probe(struct platform_device *pdev) strlcpy(i2c->adap.name, I2C_DRV_NAME, sizeof(i2c->adap.name)); - ret = mtk_i2c_set_speed(i2c, clk_get_rate(clk)); + if (i2c->default_timing_adjust) + ret = mtk_i2c_set_speed_default_timing(i2c, clk_get_rate(clk)); + else + ret = mtk_i2c_set_speed_adjust_timing(i2c, clk_get_rate(clk)); if (ret) { dev_err(&pdev->dev, "Failed to set the speed.\n"); return -EINVAL; From patchwork Thu Jul 15 02:29:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kewei Xu X-Patchwork-Id: 12378313 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,UNPARSEABLE_RELAY, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 88FD6C12002 for ; Thu, 15 Jul 2021 02:34:18 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5B171613CA for ; 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Wed, 14 Jul 2021 19:30:24 -0700 Received: from mtkmbs07n1.mediatek.inc (172.21.101.16) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 14 Jul 2021 19:30:23 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs07n1.mediatek.inc (172.21.101.16) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 15 Jul 2021 10:30:16 +0800 Received: from localhost.localdomain (10.17.3.153) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 15 Jul 2021 10:30:15 +0800 From: Kewei Xu To: CC: , , , , , , , , , , , , Subject: [PATCH 8/8] i2c: mediatek: modify bus speed calculation formula Date: Thu, 15 Jul 2021 10:29:17 +0800 Message-ID: <1626316157-24935-9-git-send-email-kewei.xu@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> References: <1626316157-24935-1-git-send-email-kewei.xu@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210714_193027_296985_7CE7EE37 X-CRM114-Status: GOOD ( 15.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org When clock-div is 0 or greater than 1, the bus speed calculated by the old speed calculation formula will be larger than the target speed. So we update the formula. Signed-off-by: Kewei Xu --- drivers/i2c/busses/i2c-mt65xx.c | 32 ++++++++++++++++++++++++-------- 1 file changed, 24 insertions(+), 8 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 486076f..4e43a79 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -68,11 +68,12 @@ #define I2C_DEFAULT_CLK_DIV 5 #define MAX_SAMPLE_CNT_DIV 8 #define MAX_STEP_CNT_DIV 64 -#define MAX_CLOCK_DIV 256 +#define MAX_CLOCK_DIV_8BITS 256 +#define MAX_CLOCK_DIV_5BITS 32 #define MAX_HS_STEP_CNT_DIV 8 -#define I2C_STANDARD_MODE_BUFFER (1000 / 2) -#define I2C_FAST_MODE_BUFFER (300 / 2) -#define I2C_FAST_MODE_PLUS_BUFFER (20 / 2) +#define I2C_STANDARD_MODE_BUFFER (1000 / 3) +#define I2C_FAST_MODE_BUFFER (300 / 3) +#define I2C_FAST_MODE_PLUS_BUFFER (20 / 3) #define I2C_CONTROL_RS (0x1 << 1) #define I2C_CONTROL_DMA_EN (0x1 << 2) @@ -719,14 +720,25 @@ static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src, unsigned int best_mul; unsigned int cnt_mul; int ret = -EINVAL; + int clock_div_constraint = 0; if (target_speed > I2C_MAX_HIGH_SPEED_MODE_FREQ) target_speed = I2C_MAX_HIGH_SPEED_MODE_FREQ; + if (i2c->default_timing_adjust) { + clock_div_constraint = 0; + } else if (i2c->dev_comp->ltiming_adjust && + i2c->ac_timing.inter_clk_div > 1) { + clock_div_constraint = 1; + } else if (i2c->dev_comp->ltiming_adjust && + i2c->ac_timing.inter_clk_div == 0) { + clock_div_constraint = -1; + } + max_step_cnt = mtk_i2c_max_step_cnt(target_speed); base_step_cnt = max_step_cnt; /* Find the best combination */ - opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed); + opt_div = DIV_ROUND_UP(clk_src >> 1, target_speed) + clock_div_constraint; best_mul = MAX_SAMPLE_CNT_DIV * max_step_cnt; /* Search for the best pair (sample_cnt, step_cnt) with @@ -761,7 +773,8 @@ static int mtk_i2c_calculate_speed(struct mtk_i2c *i2c, unsigned int clk_src, sample_cnt = base_sample_cnt; step_cnt = base_step_cnt; - if ((clk_src / (2 * sample_cnt * step_cnt)) > target_speed) { + if ((clk_src / (2 * (sample_cnt * step_cnt - clock_div_constraint))) > + target_speed) { /* In this case, hardware can't support such * low i2c_bus_freq */ @@ -846,13 +859,16 @@ static int mtk_i2c_set_speed_adjust_timing(struct mtk_i2c *i2c, target_speed = i2c->speed_hz; parent_clk /= i2c->clk_src_div; - if (i2c->dev_comp->timing_adjust) - max_clk_div = MAX_CLOCK_DIV; + if (i2c->dev_comp->timing_adjust && i2c->dev_comp->ltiming_adjust) + max_clk_div = MAX_CLOCK_DIV_5BITS; + else if (i2c->dev_comp->timing_adjust) + max_clk_div = MAX_CLOCK_DIV_8BITS; else max_clk_div = 1; for (clk_div = 1; clk_div <= max_clk_div; clk_div++) { clk_src = parent_clk / clk_div; + i2c->ac_timing.inter_clk_div = clk_div - 1; if (target_speed > I2C_MAX_FAST_MODE_PLUS_FREQ) { /* Set master code speed register */