From: Lokesh Vutla <lokeshvutla@ti.com> To: "Thierry Reding" <thierry.reding@gmail.com>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Cc: Tony Lindgren <tony@atomide.com>, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, <linux-kernel@vger.kernel.org>, <linux-pwm@vger.kernel.org>, Sekhar Nori <nsekhar@ti.com>, Lokesh Vutla <lokeshvutla@ti.com> Subject: [PATCH 3/4] pwm: omap-dmtimer: Do not disable pwm before changing period/duty_cycle Date: Mon, 24 Feb 2020 10:51:34 +0530 [thread overview] Message-ID: <20200224052135.17278-4-lokeshvutla@ti.com> (raw) In-Reply-To: <20200224052135.17278-1-lokeshvutla@ti.com> Only the Timer control register(TCLR) can be updated only when the timer is stopped. Registers like Counter register(TCRR), loader register(TLDR), match register(TMAR) can be updated when the counter is running. Since TCLR is not updated in pwm_omap_dmtimer_config(), do not stop the timer for period/duty_cycle update. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> --- drivers/pwm/pwm-omap-dmtimer.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index f13be7216847..58c61559e72f 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -102,7 +102,6 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip, u32 load_value, match_value; struct clk *fclk; unsigned long clk_rate; - bool timer_active; dev_dbg(chip->dev, "requested duty cycle: %d ns, period: %d ns\n", duty_ns, period_ns); @@ -178,25 +177,12 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip, load_value = (DM_TIMER_MAX - period_cycles) + 1; match_value = load_value + duty_cycles - 1; - /* - * We MUST stop the associated dual-mode timer before attempting to - * write its registers, but calls to omap_dm_timer_start/stop must - * be balanced so check if timer is active before calling timer_stop. - */ - timer_active = pm_runtime_active(&omap->dm_timer_pdev->dev); - if (timer_active) - omap->pdata->stop(omap->dm_timer); - omap->pdata->set_load(omap->dm_timer, true, load_value); omap->pdata->set_match(omap->dm_timer, true, match_value); dev_dbg(chip->dev, "load value: %#08x (%d), match value: %#08x (%d)\n", load_value, load_value, match_value, match_value); - /* If config was called while timer was running it must be reenabled. */ - if (timer_active) - pwm_omap_dmtimer_start(omap); - mutex_unlock(&omap->mutex); return 0; -- 2.23.0
WARNING: multiple messages have this Message-ID (diff)
From: Lokesh Vutla <lokeshvutla@ti.com> To: "Thierry Reding" <thierry.reding@gmail.com>, "Uwe Kleine-König" <u.kleine-koenig@pengutronix.de> Cc: Tony Lindgren <tony@atomide.com>, Linux OMAP Mailing List <linux-omap@vger.kernel.org>, linux-kernel@vger.kernel.org, linux-pwm@vger.kernel.org, Sekhar Nori <nsekhar@ti.com>, Lokesh Vutla <lokeshvutla@ti.com> Subject: [PATCH 3/4] pwm: omap-dmtimer: Do not disable pwm before changing period/duty_cycle Date: Mon, 24 Feb 2020 10:51:34 +0530 [thread overview] Message-ID: <20200224052135.17278-4-lokeshvutla@ti.com> (raw) In-Reply-To: <20200224052135.17278-1-lokeshvutla@ti.com> Only the Timer control register(TCLR) can be updated only when the timer is stopped. Registers like Counter register(TCRR), loader register(TLDR), match register(TMAR) can be updated when the counter is running. Since TCLR is not updated in pwm_omap_dmtimer_config(), do not stop the timer for period/duty_cycle update. Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com> --- drivers/pwm/pwm-omap-dmtimer.c | 14 -------------- 1 file changed, 14 deletions(-) diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c index f13be7216847..58c61559e72f 100644 --- a/drivers/pwm/pwm-omap-dmtimer.c +++ b/drivers/pwm/pwm-omap-dmtimer.c @@ -102,7 +102,6 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip, u32 load_value, match_value; struct clk *fclk; unsigned long clk_rate; - bool timer_active; dev_dbg(chip->dev, "requested duty cycle: %d ns, period: %d ns\n", duty_ns, period_ns); @@ -178,25 +177,12 @@ static int pwm_omap_dmtimer_config(struct pwm_chip *chip, load_value = (DM_TIMER_MAX - period_cycles) + 1; match_value = load_value + duty_cycles - 1; - /* - * We MUST stop the associated dual-mode timer before attempting to - * write its registers, but calls to omap_dm_timer_start/stop must - * be balanced so check if timer is active before calling timer_stop. - */ - timer_active = pm_runtime_active(&omap->dm_timer_pdev->dev); - if (timer_active) - omap->pdata->stop(omap->dm_timer); - omap->pdata->set_load(omap->dm_timer, true, load_value); omap->pdata->set_match(omap->dm_timer, true, match_value); dev_dbg(chip->dev, "load value: %#08x (%d), match value: %#08x (%d)\n", load_value, load_value, match_value, match_value); - /* If config was called while timer was running it must be reenabled. */ - if (timer_active) - pwm_omap_dmtimer_start(omap); - mutex_unlock(&omap->mutex); return 0; -- 2.23.0
next prev parent reply other threads:[~2020-02-24 5:22 UTC|newest] Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-02-24 5:21 [PATCH 0/4] pwm: omap-dmtimer: Allow for dynamic pwm period updates Lokesh Vutla 2020-02-24 5:21 ` Lokesh Vutla 2020-02-24 5:21 ` [PATCH 1/4] pwm: omap-dmtimer: Drop unused header file Lokesh Vutla 2020-02-24 5:21 ` Lokesh Vutla 2020-02-24 7:53 ` Uwe Kleine-König 2020-02-25 5:02 ` Lokesh Vutla 2020-02-25 5:02 ` Lokesh Vutla 2020-02-25 6:43 ` Uwe Kleine-König 2020-02-24 5:21 ` [PATCH 2/4] pwm: omap-dmtimer: Fix pwm enabling sequence Lokesh Vutla 2020-02-24 5:21 ` Lokesh Vutla 2020-02-24 8:49 ` Uwe Kleine-König 2020-02-25 5:02 ` Lokesh Vutla 2020-02-25 5:02 ` Lokesh Vutla 2020-02-24 5:21 ` Lokesh Vutla [this message] 2020-02-24 5:21 ` [PATCH 3/4] pwm: omap-dmtimer: Do not disable pwm before changing period/duty_cycle Lokesh Vutla 2020-02-24 8:55 ` Uwe Kleine-König 2020-02-25 5:02 ` Lokesh Vutla 2020-02-25 5:02 ` Lokesh Vutla 2020-02-25 6:48 ` Uwe Kleine-König 2020-02-25 7:59 ` Lokesh Vutla 2020-02-25 7:59 ` Lokesh Vutla 2020-02-25 8:38 ` Uwe Kleine-König 2020-02-25 11:26 ` Lokesh Vutla 2020-02-25 11:26 ` Lokesh Vutla 2020-02-26 16:35 ` Uwe Kleine-König 2020-02-24 5:21 ` [PATCH 4/4] pwm: omap-dmtimer: Implement .apply callback Lokesh Vutla 2020-02-24 5:21 ` Lokesh Vutla 2020-02-24 9:07 ` Uwe Kleine-König 2020-02-25 5:01 ` Lokesh Vutla 2020-02-25 5:01 ` Lokesh Vutla 2020-02-26 16:21 ` Uwe Kleine-König 2020-02-26 17:57 ` [PATCH 0/4] pwm: omap-dmtimer: Allow for dynamic pwm period updates Tony Lindgren
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20200224052135.17278-4-lokeshvutla@ti.com \ --to=lokeshvutla@ti.com \ --cc=linux-kernel@vger.kernel.org \ --cc=linux-omap@vger.kernel.org \ --cc=linux-pwm@vger.kernel.org \ --cc=nsekhar@ti.com \ --cc=thierry.reding@gmail.com \ --cc=tony@atomide.com \ --cc=u.kleine-koenig@pengutronix.de \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes, see mirroring instructions on how to clone and mirror all data and code used by this external index.