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GET /api/patches/2224006/?format=api
{ "id": 2224006, "url": "http://patchwork.ozlabs.org/api/patches/2224006/?format=api", "web_url": "http://patchwork.ozlabs.org/project/rtc-linux/patch/20260416142151.3385827-1-adriana@arista.com/", "project": { "id": 9, "url": "http://patchwork.ozlabs.org/api/projects/9/?format=api", "name": "Linux RTC development", "link_name": "rtc-linux", "list_id": "linux-rtc.vger.kernel.org", "list_email": "linux-rtc@vger.kernel.org", "web_url": "", "scm_url": "", "webscm_url": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260416142151.3385827-1-adriana@arista.com>", "list_archive_url": null, "date": "2026-04-16T14:21:51", "name": "[v3] rtc: bq32000: add configurable delay between RTC reads", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ad9dd4df5af8868f0431d1df99f48ff89013b884", "submitter": { "id": 91944, "url": "http://patchwork.ozlabs.org/api/people/91944/?format=api", "name": "Adriana Stancu", "email": "adriana@arista.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/rtc-linux/patch/20260416142151.3385827-1-adriana@arista.com/mbox/", "series": [ { "id": 500170, "url": "http://patchwork.ozlabs.org/api/series/500170/?format=api", "web_url": "http://patchwork.ozlabs.org/project/rtc-linux/list/?series=500170", "date": "2026-04-16T14:21:51", "name": "[v3] rtc: bq32000: add configurable delay between RTC reads", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/500170/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2224006/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2224006/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linux-rtc+bounces-6358-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linux-rtc@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=arista.com header.i=@arista.com header.a=rsa-sha256\n header.s=google header.b=MeYkFXFz;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org\n (client-ip=172.105.105.114; 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This results in stale data reads or select() timeouts\nin userspace.\n\nThis patch introduces a delay before reading the RTC registers in order to\nprovide a sufficient idle time for the hardware to sync with the register\nbuffer.\n\nSigned-off-by: Adriana Stancu <adriana@arista.com>\n---\n drivers/rtc/rtc-bq32k.c | 9 +++++++++\n 1 file changed, 9 insertions(+)", "diff": "diff --git a/drivers/rtc/rtc-bq32k.c b/drivers/rtc/rtc-bq32k.c\nindex 7ad34539be4d..edce95eb328f 100644\n--- a/drivers/rtc/rtc-bq32k.c\n+++ b/drivers/rtc/rtc-bq32k.c\n@@ -16,6 +16,7 @@\n #include <linux/kstrtox.h>\n #include <linux/errno.h>\n #include <linux/bcd.h>\n+#include <linux/delay.h>\n \n #define BQ32K_SECONDS\t\t0x00\t/* Seconds register address */\n #define BQ32K_SECONDS_MASK\t0x7F\t/* Mask over seconds value */\n@@ -89,9 +90,17 @@ static int bq32k_write(struct device *dev, void *data, uint8_t off, uint8_t len)\n \n static int bq32k_rtc_read_time(struct device *dev, struct rtc_time *tm)\n {\n+\tstruct i2c_client *client = to_i2c_client(dev);\n \tstruct bq32k_regs regs;\n \tint error;\n \n+\t/*\n+\t * When the device doesn't have the interrupt connected, prevent\n+\t * userpace from polling the RTC registers to frequently.\n+\t */\n+\tif (client->irq <= 0)\n+\t\tusleep_range(2000, 2500);\n+\n \terror = bq32k_read(dev, ®s, 0, sizeof(regs));\n \tif (error)\n \t\treturn error;\n", "prefixes": [ "v3" ] }