linux-kernel - [PATCH AUTOSEL 5.4 205/205] phy/rockchip: inno-hdmi: round clock rate down to closest 1000 Hz

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Message-Id: <20200116164300.6705-205-sashal@kernel.org>
Date:   Thu, 16 Jan 2020 11:43:00 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Jonas Karlman <jonas@...boo.se>,
        Kishon Vijay Abraham I <kishon@...com>,
        Sasha Levin <sashal@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.4 205/205] phy/rockchip: inno-hdmi: round clock rate down to closest 1000 Hz

From: Jonas Karlman <jonas@...boo.se>

[ Upstream commit 4f510aa10468954b1da4e94689c38ac6ea8d3627 ]

Commit 287422a95fe2 ("drm/rockchip: Round up _before_ giving to the clock framework")
changed what rate clk_round_rate() is called with, an additional 999 Hz
added to the requsted mode clock. This has caused a regression on RK3328
and presumably also on RK3228 because the inno-hdmi-phy clock requires an
exact match of the requested rate in the pre pll config table.

When an exact match is not found the parent clock rate (24MHz) is returned
to the clk_round_rate() caller. This cause wrong pixel clock to be used and
result in no-signal when configuring a mode on RK3328.

Fix this by rounding the rate down to closest 1000 Hz in round_rate func,
this allows an exact match to be found in pre pll config table.

Fixes: 287422a95fe2 ("drm/rockchip: Round up _before_ giving to the clock framework")
Signed-off-by: Jonas Karlman <jonas@...boo.se>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/phy/rockchip/phy-rockchip-inno-hdmi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
index 2b97fb1185a0..9ca20c947283 100644
--- a/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
+++ b/drivers/phy/rockchip/phy-rockchip-inno-hdmi.c
@@ -603,6 +603,8 @@ static long inno_hdmi_phy_rk3228_clk_round_rate(struct clk_hw *hw,
 {
 	const struct pre_pll_config *cfg = pre_pll_cfg_table;
 
+	rate = (rate / 1000) * 1000;
+
 	for (; cfg->pixclock != 0; cfg++)
 		if (cfg->pixclock == rate && !cfg->fracdiv)
 			break;
@@ -755,6 +757,8 @@ static long inno_hdmi_phy_rk3328_clk_round_rate(struct clk_hw *hw,
 {
 	const struct pre_pll_config *cfg = pre_pll_cfg_table;
 
+	rate = (rate / 1000) * 1000;
+
 	for (; cfg->pixclock != 0; cfg++)
 		if (cfg->pixclock == rate)
 			break;
-- 
2.20.1