linux-kernel - [PATCH,v2] pwm: mtk-disp: Fix the parameters calculated by the enabled flag of disp

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Message-ID: <1663934771-15152-1-git-send-email-xinlei.lee@mediatek.com>
Date:   Fri, 23 Sep 2022 20:06:11 +0800
From:   <xinlei.lee@...iatek.com>
To:     <thierry.reding@...il.com>, <u.kleine-koenig@...gutronix.de>,
        <matthias.bgg@...il.com>
CC:     <linux-pwm@...r.kernel.org>, <linux-mediatek@...ts.infradead.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        <jitao.shi@...iatek.com>, xinlei lee <xinlei.lee@...iatek.com>
Subject: [PATCH,v2] pwm: mtk-disp: Fix the parameters calculated by the enabled flag of disp_pwm

From: xinlei lee <xinlei.lee@...iatek.com>

In the original mtk_disp_pwm_get_state() function, the result of reading
con0 & BIT(0) is enabled as disp_pwm.
In order to conform to the register table, we should use the disp_pwm
base address as the enabled judgment.

Fixes: 3f2b16734914 ("pwm: mtk-disp: Implement atomic API .get_state()")

Signed-off-by: xinlei lee <xinlei.lee@...iatek.com>
---
Base on the branch of Linux-next/master.

change since v1:
1. Modify the way to set disp_pwm enbale.
---
---
 drivers/pwm/pwm-mtk-disp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/pwm/pwm-mtk-disp.c b/drivers/pwm/pwm-mtk-disp.c
index c605013..1a9880d 100644
--- a/drivers/pwm/pwm-mtk-disp.c
+++ b/drivers/pwm/pwm-mtk-disp.c
@@ -197,7 +197,7 @@ static void mtk_disp_pwm_get_state(struct pwm_chip *chip,
 	rate = clk_get_rate(mdp->clk_main);
 	con0 = readl(mdp->base + mdp->data->con0);
 	con1 = readl(mdp->base + mdp->data->con1);
-	state->enabled = !!(con0 & BIT(0));
+	state->enabled = !!(readl(mdp->base + DISP_PWM_EN) & BIT(0));
 	clk_div = FIELD_GET(PWM_CLKDIV_MASK, con0);
 	period = FIELD_GET(PWM_PERIOD_MASK, con1);
 	/*
-- 
2.6.4