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Tue, 06 Apr 2021 02:58:56 -0700 Received: from mtkmbs05n2.mediatek.inc (172.21.101.140) by MTKMBS62DR.mediatek.inc (172.29.94.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 6 Apr 2021 02:58:54 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs05n2.mediatek.inc (172.21.101.140) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 6 Apr 2021 17:58:53 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 6 Apr 2021 17:58:52 +0800 From: Rex-BC Chen To: , , , CC: , , , , , Rex-BC Chen , Jitao Shi Subject: [v3,PATCH 3/3] pwm: mtk_disp: implement .get_state() Date: Tue, 6 Apr 2021 17:57:42 +0800 Message-ID: <1617703062-4251-4-git-send-email-rex-bc.chen@mediatek.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1617703062-4251-1-git-send-email-rex-bc.chen@mediatek.com> References: <1617703062-4251-1-git-send-email-rex-bc.chen@mediatek.com> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210406_105903_196708_51C64B54 X-CRM114-Status: GOOD ( 10.43 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org implement get_state function for pwm-mtk-disp Signed-off-by: Rex-BC Chen Signed-off-by: Jitao Shi --- drivers/pwm/pwm-mtk-disp.c | 46 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c index 502228adf718..166e0a8ca703 100644 --- a/drivers/pwm/pwm-mtk-disp.c +++ b/drivers/pwm/pwm-mtk-disp.c @@ -179,8 +179,54 @@ static int mtk_disp_pwm_apply(struct pwm_chip *chip, struct pwm_device *pwm, return mtk_disp_pwm_enable(chip, state); } +static void mtk_disp_pwm_get_state(struct pwm_chip *chip, + struct pwm_device *pwm, + struct pwm_state *state) +{ + struct mtk_disp_pwm *mdp = to_mtk_disp_pwm(chip); + u32 clk_div, period, high_width, con0, con1; + u64 rate; + int err; + + err = clk_prepare_enable(mdp->clk_main); + if (err < 0) { + dev_err(chip->dev, "Can't enable mdp->clk_main: %d\n", err); + return; + } + err = clk_prepare_enable(mdp->clk_mm); + if (err < 0) { + dev_err(chip->dev, "Can't enable mdp->clk_mm: %d\n", err); + clk_disable_unprepare(mdp->clk_main); + return; + } + + rate = clk_get_rate(mdp->clk_main); + + con0 = readl(mdp->base + mdp->data->con0); + con1 = readl(mdp->base + mdp->data->con1); + + state->polarity = con0 & PWM_POLARITY ? + PWM_POLARITY_INVERSED : PWM_POLARITY_NORMAL; + state->enabled = !!(con0 & BIT(0)); + + clk_div = (con0 & PWM_CLKDIV_MASK) >> PWM_CLKDIV_SHIFT; + period = con1 & PWM_PERIOD_MASK; + state->period = div_u64(period * (clk_div + 1) * NSEC_PER_SEC, rate); + high_width = (con1 & PWM_HIGH_WIDTH_MASK) >> PWM_HIGH_WIDTH_SHIFT; + state->duty_cycle = div_u64(high_width * (clk_div + 1) * NSEC_PER_SEC, + rate); + + if (!state->enabled) { + clk_disable_unprepare(mdp->clk_mm); + clk_disable_unprepare(mdp->clk_main); + } + + mdp->enabled = state->enabled; +} + static const struct pwm_ops mtk_disp_pwm_ops = { .apply = mtk_disp_pwm_apply, + .get_state = mtk_disp_pwm_get_state, .owner = THIS_MODULE, };