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Fri, 2 Oct 2020 12:22:55 +0000 (GMT) From: =?UTF-8?q?=C5=81ukasz=20Stelmach?= To: Kukjin Kim , Krzysztof Kozlowski , Tomasz Figa , Andi Shyti , Mark Brown , linux-spi@vger.kernel.org, linux-samsung-soc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: Marek Szyprowski , =?UTF-8?q?Bart=C5=82omiej=20=C5=BBo=C5=82nierkiewicz?= , =?UTF-8?q?=C5=81ukasz=20Stelmach?= Subject: [PATCH v3 8/9] spi: spi-s3c64xx: Increase transfer timeout Date: Fri, 2 Oct 2020 14:22:42 +0200 Message-Id: <20201002122243.26849-9-l.stelmach@samsung.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201002122243.26849-1-l.stelmach@samsung.com> MIME-Version: 1.0 Organization: Samsung R&D Institute Poland Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrDKsWRmVeSWpSXmKPExsWy7djPc7oLpMvjDSY1slks/vGcyWLjjPWs FlMfPmGz6H/8mtni/PkN7BY3D61gtNj0+BqrxeVdc9gsZpzfx2TR+PEmu8XaI3fZLVbt+sPo wONxfcknZo+ds+6ye2xa1cnmsXlJvUffllWMHp83yQWwRXHZpKTmZJalFunbJXBlfDh4lqng M0fF/v1PGRsYZ7J3MXJySAiYSKxb+Iipi5GLQ0hgBaPEzkWXoJwvjBKvbyxlh3A+M0p8fPua Caal8ew3VojEckaJqzsaoKqeM0r09l9nBqliE3CU6F96AqxKRGA7k8TEz+dZQBxmgaOMEpsf XAVyODiEBZwlFj4qAGlgEVCV2PFwFyuIzStgLTH1/D5GiHXyEu3Lt7OB2JwCNhInF21jg6gR lDg58wkLiM0voCWxpuk6mM0MVN+8dTYzyC4JgXvsEucnzGeGGOQicbF9AdRQYYlXx7dAg0BG 4v/O+Uwg90gI1EtMnmQG0dvDKLFtzg8WiBpriTvnfrGB1DALaEqs36UPEXaUuHGwjRWilU/i xltBiBP4JCZtm84MEeaV6GgTgqhWkVjXvwdqoJRE76sVjBMYlWYheWYWkgdmIexawMi8ilE8 tbQ4Nz212DgvtVyvODG3uDQvXS85P3cTIzBNnf53/OsOxn1/kg4xCnAwKvHwZhwqjRdiTSwr rsw9xCjBwawkwut09nScEG9KYmVValF+fFFpTmrxIUZpDhYlcV7jRS9jhQTSE0tSs1NTC1KL YLJMHJxSDYxpZz0yd0S0du4MK6o/+SO0ZMPduRXG/Q5bDh/+t2mG16LEDc6B366JW0j+Xxo6 c2lv5Sb77wFbDqZXT37FcGJtXEeP+wEOXtaUrrf7j4qaz/Zva5V/Uf2bR4HvzZ90Az/Pp2uv azy15uB7ujI6vTEyN+mgpvx6gbKiyzVe6//3KhrHrPkb+UuJpTgj0VCLuag4EQBSuxjqTwMA AA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFjrDIsWRmVeSWpSXmKPExsVy+t/xu7rzpcvjDc5/ULFY/OM5k8XGGetZ LaY+fMJm0f/4NbPF+fMb2C1uHlrBaLHp8TVWi8u75rBZzDi/j8mi8eNNdou1R+6yW6za9YfR gcfj+pJPzB47Z91l99i0qpPNY/OSeo++LasYPT5vkgtgi9KzKcovLUlVyMgvLrFVija0MNIz tLTQMzKx1DM0No+1MjJV0rezSUnNySxLLdK3S9DL+HDwLFPBZ46K/fufMjYwzmTvYuTkkBAw kWg8+421i5GLQ0hgKaPEhh27WLoYOYASUhIr56ZD1AhL/LnWxQZR85RR4s/U02DNbAKOEv1L T4A1iwjsZ5K4dOE+C4jDLHCYUeLyunVMIJOEBZwlFj4qAGlgEVCV2PFwFyuIzStgLTH1/D5G iA3yEu3Lt7OB2JwCNhInF20Ds4WAalo/zoWqF5Q4OfMJ2HHMAuoS6+cJgYT5BbQk1jRdZwGx mYHGNG+dzTyBUWgWko5ZCB2zkFQtYGRexSiSWlqcm55bbKRXnJhbXJqXrpecn7uJERiT2479 3LKDsetd8CFGAQ5GJR5egQOl8UKsiWXFlbmHGCU4mJVEeJ3Ono4T4k1JrKxKLcqPLyrNSS0+ xGgK9OZEZinR5HxgusgriTc0NTS3sDQ0NzY3NrNQEuftEDgYIySQnliSmp2aWpBaBNPHxMEp 1cDYaFtzduvJZSvLf1X9qvrEy/nYx8DTJUn2jEGld8nGudOSD+79+2GRpP8t555zFS6Hlp1Q mB5R/UDxeGiK9KEjF+6JXZdqrMx6N4fzDDfHNq/jzo8aVjBqdu/9r7jV07eDO2Xe2il5mpZy rb3f7ASEmrz0ZX30bkw/ILp0zp7NF//uPbnY5Q+vEktxRqKhFnNRcSIAtLk2Jd8CAAA= X-CMS-MailID: 20201002122255eucas1p2cec6d9cdac111d6f2dc628c7865f7bd5 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-RootMTR: 20201002122255eucas1p2cec6d9cdac111d6f2dc628c7865f7bd5 X-EPHeader: CA CMS-TYPE: 201P X-CMS-RootMailID: 20201002122255eucas1p2cec6d9cdac111d6f2dc628c7865f7bd5 References: <20201002122243.26849-1-l.stelmach@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Increase timeout by 30 ms for some wiggle room and set the minimum value to 100 ms. This ensures a non-zero value for short transfers which may take less than 1 ms. The timeout value does not affect performance because it is used with a completion. Similar formula is used in other drivers e.g. sun4i, sun6i. Reviewed-by: Krzysztof Kozlowski Signed-off-by: Łukasz Stelmach --- drivers/spi/spi-s3c64xx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c index 0bd3e230350c..9f728a7c59a1 100644 --- a/drivers/spi/spi-s3c64xx.c +++ b/drivers/spi/spi-s3c64xx.c @@ -473,7 +473,8 @@ static int s3c64xx_wait_for_dma(struct s3c64xx_spi_driver_data *sdd, /* millisecs to xfer 'len' bytes @ 'cur_speed' */ ms = xfer->len * 8 * 1000 / sdd->cur_speed; - ms += 10; /* some tolerance */ + ms += 30; /* some tolerance */ + ms = max(ms, 100); /* minimum timeout */ val = msecs_to_jiffies(ms) + 10; val = wait_for_completion_timeout(&sdd->xfer_completion, val); -- 2.26.2