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GET /api/1.1/patches/2223544/?format=api
{ "id": 2223544, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2223544/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/patch/20260415143724.447340-2-u.kleine-koenig@baylibre.com/", "project": { "id": 38, "url": "http://patchwork.ozlabs.org/api/1.1/projects/38/?format=api", "name": "Linux PWM development", "link_name": "linux-pwm", "list_id": "linux-pwm.vger.kernel.org", "list_email": "linux-pwm@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260415143724.447340-2-u.kleine-koenig@baylibre.com>", "date": "2026-04-15T14:37:25", "name": "[libpwm] pwmtestperf: Implement -I for inversed polarity requests", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "4b7dad49f159d6a7327f86b42f02b290b449cc23", "submitter": { "id": 88686, "url": "http://patchwork.ozlabs.org/api/1.1/people/88686/?format=api", "name": "Uwe Kleine-König (The Capable Hub)", "email": "u.kleine-koenig@baylibre.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linux-pwm/patch/20260415143724.447340-2-u.kleine-koenig@baylibre.com/mbox/", "series": [ { "id": 499999, "url": "http://patchwork.ozlabs.org/api/1.1/series/499999/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linux-pwm/list/?series=499999", "date": "2026-04-15T14:37:25", "name": "[libpwm] pwmtestperf: Implement -I for inversed polarity requests", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/499999/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2223544/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2223544/checks/", "tags": {}, "headers": { "Return-Path": "\n <linux-pwm+bounces-8588-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-pwm@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=baylibre-com.20251104.gappssmtp.com\n header.i=@baylibre-com.20251104.gappssmtp.com header.a=rsa-sha256\n header.s=20251104 header.b=ydtbJb7h;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=2600:3c0a:e001:db::12fc:5321; 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charset=UTF-8", "X-Developer-Signature": "v=1; a=openpgp-sha256; l=3121;\n i=u.kleine-koenig@baylibre.com; h=from:subject;\n bh=LfIjyYyx/IBzVebqbxiNT5LiUQSWc2N9K+ipy/DWAZE=;\n b=owEBbQGS/pANAwAKAY+A+1h9Ev5OAcsmYgBp36Kk1sGFVjHggig6sRmR5jT+wrWun3Z4GddvR\n TK5xONajAiJATMEAAEKAB0WIQQ/gaxpOnoeWYmt/tOPgPtYfRL+TgUCad+ipAAKCRCPgPtYfRL+\n TugzB/9Z72ejKRy0vDGu3ecChs7h3QN/GTx/KL6FZQ+0R1HZecPReUeRYcJK2CO4iSMtcQNr5mD\n IA1kb9h18DhmYDyF79uMZO8/vesWZzVsfr9vjRGuT6+nujjZIwh2hXL3WyYBYkNfVV7pP7Txp+h\n yzf2zk28yASHIevOYAgA0XZ7qeUyBFy1DwKwQU1fNnOSFn142GztKcbsyXmElU0Qro9yMS0MMfW\n Hir5eG/LtZad2uehcvczyRClo/ml242LKBYmP6CA1eqoW0CjTTOvCadZSeTu3mLIJv0+wEhJZF+\n Y5lmI53GyPy1xeBipsrItWHi8tafTYwJRqXNLv/U4TBLqpxh", "X-Developer-Key": "i=u.kleine-koenig@baylibre.com; a=openpgp;\n fpr=0D2511F322BFAB1C1580266BE2DCDD9132669BD6", "Content-Transfer-Encoding": "8bit" }, "content": "The driver handling for .duty_offset_ns > 0 isn't always trivial to get\nright. So make pwmtestperf capable to do some tests with a non-zero duty\noffset.\n\nFix a typo in the manpage en passant.\n\nSigned-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>\n---\nHello,\n\ntriggered by a driver submission by Andrea della Porta[1], this increases\ntest coverage to (hopefully) catch issues around driver handling of\nduty offset.\n\nTesing that on stm32 indeed found a bug, will send a patch for that\nlater.\n\nBest regards\nUwe\n\n[1] https://lore.kernel.org/linux-pwm/adkrHkANCzxO8KUP@monoceros/\n\n pwmtestperf.1 | 13 +++++++++++--\n pwmtestperf.c | 17 ++++++++++++++++-\n 2 files changed, 27 insertions(+), 3 deletions(-)", "diff": "diff --git a/pwmtestperf.1 b/pwmtestperf.1\nindex 74dc8e30f32a..944564c14a0b 100644\n--- a/pwmtestperf.1\n+++ b/pwmtestperf.1\n@@ -13,6 +13,7 @@ pwmtestperf \\- Applies a simple test pattern to a PWM output\n .IB periodlength ]\n .RB [ \\-S\\~\\c\n .IB step ]\n+.RB [ \\-I ]\n .RB [ \\-v ]\n .YS\n .SH Description\n@@ -27,7 +28,7 @@ and\n \n The fixed period is specified by\n .I periodlength\n-and the duty length is increased in each steps by\n+and the duty length is increased in each step by\n .I step \n up from 0 to\n .IR periodlength .\n@@ -35,7 +36,11 @@ up from 0 to\n .I step \n is negative, it decreases from\n .I periodlength\n-to 0.\n+to 0. With\n+.B \\-I\n+given the duty offset in each request is chosen to describe an inversed\n+polarity waveform, that is a falling edge at the end of each period. Otherwise\n+the duty offset is zero.\n .\n .SH Options\n .\n@@ -68,6 +73,10 @@ in nanoseconds defines the length of the periods of the waveform to be set.\n in nanoseconds defines the step the duty length is increased in each step. (Or decreased if negative.)\n .\n .TP\n+.B \\-I\n+Use requests with inverted polarity.\n+.\n+.TP\n .B \\-v\n Emit some information during runtime.\n .\ndiff --git a/pwmtestperf.c b/pwmtestperf.c\nindex 72abf3987459..95be2b6fe64e 100644\n--- a/pwmtestperf.c\n+++ b/pwmtestperf.c\n@@ -22,16 +22,21 @@ int main(int argc, char *const argv[])\n \tint ret;\n \tint opt;\n \tlong long step = 1;\n+\tbool inverted = false;\n \n \tunsigned int chipno = 0;\n \tunsigned int pwmno = 0;\n \n-\twhile ((opt = getopt(argc, argv, \"c:p:P:S:\")) != -1) {\n+\twhile ((opt = getopt(argc, argv, \"c:Ip:P:S:\")) != -1) {\n \t\tswitch (opt) {\n \t\tcase 'c':\n \t\t\tchipno = atoi(optarg);\n \t\t\tbreak;\n \n+\t\tcase 'I':\n+\t\t\tinverted = true;\n+\t\t\tbreak;\n+\n \t\tcase 'p':\n \t\t\tpwmno = atoi(optarg);\n \t\t\tbreak;\n@@ -67,6 +72,16 @@ int main(int argc, char *const argv[])\n \t}\n \n \tfor (wf.duty_length_ns = (step > 0 ? 0 : wf.period_length_ns); wf.duty_length_ns <= wf.period_length_ns; wf.duty_length_ns += step) {\n+\n+\t\t/*\n+\t\t * .duty_length_ns must be < .period_length_ns, so don't invert\n+\t\t * for .duty_length_ns == 0.\n+\t\t */\n+\t\tif (inverted && wf.duty_length_ns)\n+\t\t\twf.duty_offset_ns = wf.period_length_ns - wf.duty_length_ns;\n+\t\telse\n+\t\t\twf.duty_offset_ns = 0;\n+\n \t\tret = pwm_set_waveform(pwm, &wf);\n \t\tif (ret < 0) {\n \t\t\tperror(\"Failed to configure PWM\");\n", "prefixes": [ "libpwm" ] }