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From:   Jagan Teki <jagan@amarulasolutions.com>
To:     Maxime Ripard <maxime.ripard@bootlin.com>,
        David Airlie <airlied@linux.ie>,
        Daniel Vetter <daniel@ffwll.ch>, Chen-Yu Tsai <wens@csie.org>,
        Michael Turquette <mturquette@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>
Cc:     linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org,
        linux-clk@vger.kernel.org, dri-devel@lists.freedesktop.org,
        devicetree@vger.kernel.org,
        Michael Trimarchi <michael@amarulasolutions.com>,
        linux-amarula@amarulasolutions.com, linux-sunxi@googlegroups.com,
        Jagan Teki <jagan@amarulasolutions.com>
Subject: [PATCH v6 10/22] clk: sunxi-ng: Add check for minimal rate to NKM PLLs
Date:   Fri, 25 Jan 2019 01:28:48 +0530
Message-Id: <20190124195900.22620-11-jagan@amarulasolutions.com>
In-Reply-To: <20190124195900.22620-1-jagan@amarulasolutions.com>
References: <20190124195900.22620-1-jagan@amarulasolutions.com>
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Some NKM PLLs doesn't work well when their output clock rate is set below
certain rate.

So, add support for minimal rate for relevant PLLs.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Stephen Boyd <sboyd@kernel.org>
---
 drivers/clk/sunxi-ng/ccu_nkm.c | 5 +++++
 drivers/clk/sunxi-ng/ccu_nkm.h | 1 +
 2 files changed, 6 insertions(+)

diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
index 841840e35e61..096ff4f4839a 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.c
+++ b/drivers/clk/sunxi-ng/ccu_nkm.c
@@ -125,6 +125,11 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
 	if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
 		rate *= nkm->fixed_post_div;
 
+	if (rate < nkm->min_rate) {
+		rate = nkm->min_rate;
+		return rate;
+	}
+
 	ccu_nkm_find_best(*parent_rate, rate, &_nkm);
 
 	rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
index cc6efb70a102..ff5bd00f429f 100644
--- a/drivers/clk/sunxi-ng/ccu_nkm.h
+++ b/drivers/clk/sunxi-ng/ccu_nkm.h
@@ -35,6 +35,7 @@ struct ccu_nkm {
 	struct ccu_mux_internal	mux;
 
 	unsigned int		fixed_post_div;
+	unsigned int		min_rate;
 
 	struct ccu_common	common;
 };
-- 
2.18.0.321.gffc6fa0e3