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Wed, 8 Nov 2023 16:44:04 +0000 (GMT) Received: from eusmgms2.samsung.com (unknown [182.198.249.180]) by eusmtrp2.samsung.com (KnoxPortal) with ESMTP id 20231108164404eusmtrp221c9ce923becbcc519ef35e9337ca30f~Vs4snijxN2869728697eusmtrp2G; Wed, 8 Nov 2023 16:44:04 +0000 (GMT) X-AuditID: cbfec7f4-993ff70000022c38-7c-654bbad4957d Received: from eusmtip2.samsung.com ( [203.254.199.222]) by eusmgms2.samsung.com (EUCPMTA) with SMTP id 9A.12.25043.4DABB456; Wed, 8 Nov 2023 16:44:04 +0000 (GMT) Received: from AMDC4653.digital.local (unknown [106.120.51.32]) by eusmtip2.samsung.com (KnoxPortal) with ESMTPA id 20231108164403eusmtip2b93279776c1de1a4da9671ccbfef3092~Vs4r-k7-50975909759eusmtip2C; Wed, 8 Nov 2023 16:44:03 +0000 (GMT) From: Marek Szyprowski To: linux-samsung-soc@vger.kernel.org, linux-i2c@vger.kernel.org Cc: Marek Szyprowski , Krzysztof Kozlowski , Alim Akhtar , Andi Shyti , Wolfram Sang , Chanho Park Subject: [PATCH v4 2/3] i2c: s3c24xx: fix transferring more than one message in polling mode Date: Wed, 8 Nov 2023 17:43:53 +0100 Message-Id: <20231108164354.712406-3-m.szyprowski@samsung.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231108164354.712406-1-m.szyprowski@samsung.com> MIME-Version: 1.0 X-Brightmail-Tracker: H4sIAAAAAAAAA02Se0hTYRjG+XaO29lg6zgdvnQbSUoabWpBpyw1LThhSHSvP6yRBxV1yi5Z kaETy1TMNKwmXkLDMfGSOS/DXIpoOqdlJeElJeyqluZKLKycZ13++73v+zzf877wEZg432U1 EavUMCqlIt6TK8Abuxb7tzw3hzN+mWaKmihp5FLjXzMR9cyymXo4ZeJRmUt2RN0eaONQ1Z1j PGrMUoxCCLreeI1Ljw61cuncBiOi5+vXH8RPCXZFMfGx5xiVPOiMIMYyZ0NJre7nS6ZfcFLR KzIL8Qkgt0GaftwlCwkIMWlAUPtmFLGFHUFOYaVzMo/AnGHh/rFcL23lsYNKBJP2Ks5fi25w ekXFJf0hayZrhd3JECipXuA5GCN/IliwyxzsRkbCjZpF3ME46QV36ytXNEIyCGqalnA2TQqW dhvmYD4ZDNl5RU6NK/TcmcTZN6WQbirCHEsA2UyA8ceQ07wXah/cc7IbfOxu4LG8Fn61lHJY w1UEZT/GnUUegtR3w4hVBcJo//flE4jlCB+oNcvZ9h6Y07UhRxtIEbyccWWXEEF+4y2MbQsh 84qYVXuDvrvmb2z7k0GMZRp6rAt4Htqg/+8c/X/n6P/lliHMiDwYrTohmlEHKJlkmVqRoNYq o2VnExPq0fK3sf7stjejyo9zsg7EIVAHAgLzdBcuBdOMWBiluHCRUSWeVmnjGXUHWkPgnh5C rygpIyajFRomjmGSGNWfKYfgr07lHH96sDzc5bFf0KUGWxhs+XRCakrc0ycJ0++uCzNsz7Am iWy+kUr5t66IlO0VRO5wWnTjBYtWwK3xfjsuci8xdMqmKgJ0B0yuB9o2Wfcu3tqqehoTO91X tc16cj5CI+51zUm5u/+BRxWnrrBFN1WasXOmOtmFejkpT58lj/nkFPSOJBU2FbTy9yWPSEJ4 w/Th2vcJ8rK52ZMvLosD/V5fnkg2j0x98GraYJJoBlLi2sm3m6Mea3ZIQ5pjbIcEvKN0ypeJ N7lDn1OHIzYWha/y6BRJ6HVpN4+YAns0p/G40LqIgvRynV5dGHz/0uDsp/zitYYxbXZYUVdV aLy31O2RJ66OUfj7Yiq14jdnbqWApQMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrHLMWRmVeSWpSXmKPExsVy+t/xe7pXdnmnGvQtlLd4MG8bm8X9rx2M Fpf3a1vsfb2V3aLj7xdGixnn9zFZrD1yl93i7v65jA4cHptWdbJ53Lm2h82jb8sqRo/Pm+QC WKL0bIryS0tSFTLyi0tslaINLYz0DC0t9IxMLPUMjc1jrYxMlfTtbFJSczLLUov07RL0MvZ/ PMtYsEekYt6bq0wNjPcEuhg5OSQETCT65+9h72Lk4hASWMoo8eBIPxtEQkbi5LQGVghbWOLP tS6wuJDAJ0aJc/sVQGw2AUOJrrcQcREBJ4nbi2axggxiFmhikug4sQhoKgeHsECMxJdWLZAa FgFViYWblrOD2LwCdhLrtv9lgZgvL7H/4FlmEJtTwF6ie8JsdohddhLfLxxmg6gXlDg58wlY PTNQffPW2cwTGAVmIUnNQpJawMi0ilEktbQ4Nz232EivODG3uDQvXS85P3cTIzAith37uWUH 48pXH/UOMTJxMB5ilOBgVhLh/WvvkSrEm5JYWZValB9fVJqTWnyI0RTo7onMUqLJ+cCYzCuJ NzQzMDU0MbM0MLU0M1YS5/Us6EgUEkhPLEnNTk0tSC2C6WPi4JRqYOpziLp674rqrMJDsXsO Orbo9VUflPHieXa3YKqpCrvFy8LwuVLxvIF1Qb0p6qK9GZMfT/n18eHK6C+cfYctMtRT/p5J WjM34mbowYddehGSX67cP8XGteje1LzFf1edzdEInmidyWNdpJ/8YkFNcC3PZs6qdbnlH7pf PXjyIH5zsIpMTV/JlxWH7etvmwooVie+eCPJXJy1LE617uH2yzluuhut89g29C/40Xp1U+PD 9YeuKTiY3Hu3dUeu8DH1sH+zDfK0HSs2HPkgkPjl1MxMo0fHTbfV9PnIMoQ8/BnyxZJ/z2FX FbHIKMEEL/2jd9I9S0vaJoW97z8hne7qFhnlsyBazdnuu9PXUJtIJZbijERDLeai4kQAbLHB axEDAAA= X-CMS-MailID: 20231108164404eucas1p2b4d3bbbd618707456d3d667fabccc4f9 X-Msg-Generator: CA X-RootMTR: 20231108164404eucas1p2b4d3bbbd618707456d3d667fabccc4f9 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20231108164404eucas1p2b4d3bbbd618707456d3d667fabccc4f9 References: <20231108164354.712406-1-m.szyprowski@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-samsung-soc@vger.kernel.org To properly handle ACK on the bus when transferring more than one message in polling mode, move the polling handling loop from s3c24xx_i2c_message_start() to s3c24xx_i2c_doxfer(). This way i2c_s3c_irq_nextbyte() is always executed till the end, properly acknowledging the IRQ bits and no recursive calls to i2c_s3c_irq_nextbyte() are made. While touching this, also fix finishing transfers in polling mode by using common code path and always waiting for the bus to become idle and disabled. Fixes: 117053f77a5a ("i2c: s3c2410: Add polling mode support") Signed-off-by: Marek Szyprowski Reviewed-by: Andi Shyti --- drivers/i2c/busses/i2c-s3c2410.c | 27 ++++++++++----------------- 1 file changed, 10 insertions(+), 17 deletions(-) diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-s3c2410.c index bf9a5670ef33..c0fe96a4f2c4 100644 --- a/drivers/i2c/busses/i2c-s3c2410.c +++ b/drivers/i2c/busses/i2c-s3c2410.c @@ -279,16 +279,6 @@ static void s3c24xx_i2c_message_start(struct s3c24xx_i2c *i2c, stat |= S3C2410_IICSTAT_START; writel(stat, i2c->regs + S3C2410_IICSTAT); - - if (i2c->quirks & QUIRK_POLL) { - while ((i2c->msg_num != 0) && is_ack(i2c)) { - i2c_s3c_irq_nextbyte(i2c, stat); - stat = readl(i2c->regs + S3C2410_IICSTAT); - - if (stat & S3C2410_IICSTAT_ARBITR) - dev_err(i2c->dev, "deal with arbitration loss\n"); - } - } } static inline void s3c24xx_i2c_stop(struct s3c24xx_i2c *i2c, int ret) @@ -694,7 +684,7 @@ static void s3c24xx_i2c_wait_idle(struct s3c24xx_i2c *i2c) static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, struct i2c_msg *msgs, int num) { - unsigned long timeout; + unsigned long timeout = 0; int ret; ret = s3c24xx_i2c_set_master(i2c); @@ -714,16 +704,19 @@ static int s3c24xx_i2c_doxfer(struct s3c24xx_i2c *i2c, s3c24xx_i2c_message_start(i2c, msgs); if (i2c->quirks & QUIRK_POLL) { - ret = i2c->msg_idx; + while ((i2c->msg_num != 0) && is_ack(i2c)) { + unsigned long stat = readl(i2c->regs + S3C2410_IICSTAT); - if (ret != num) - dev_dbg(i2c->dev, "incomplete xfer (%d)\n", ret); + i2c_s3c_irq_nextbyte(i2c, stat); - goto out; + stat = readl(i2c->regs + S3C2410_IICSTAT); + if (stat & S3C2410_IICSTAT_ARBITR) + dev_err(i2c->dev, "deal with arbitration loss\n"); + } + } else { + timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); } - timeout = wait_event_timeout(i2c->wait, i2c->msg_num == 0, HZ * 5); - ret = i2c->msg_idx; /*