linux-kernel - [PATCH] clk: qcom: ipq8074: Use floor ops for SDCC1 clock

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Date:   Thu, 10 Feb 2022 18:31:00 +0100
From:   Robert Marko <robimarko@...il.com>
To:     agross@...nel.org, bjorn.andersson@...aro.org,
        mturquette@...libre.com, sboyd@...nel.org, absahu@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dirk Buchwalder <buchwalder@...teo.de>,
        Robert Marko <robimarko@...il.com>
Subject: [PATCH] clk: qcom: ipq8074: Use floor ops for SDCC1 clock

From: Dirk Buchwalder <buchwalder@...teo.de>

Use floor ops on SDCC1 APPS clock in order to round down selected clock
frequency and avoid overclocking SD/eMMC cards.

For example, currently HS200 cards were failling tuning as they were
actually being clocked at 384MHz instead of 192MHz.
This caused some boards to disable 1.8V I/O and force the eMMC into the
standard HS mode (50MHz) and that appeared to work despite the eMMC being
overclocked to 96Mhz in that case.

There was a previous commit to use floor ops on SDCC clocks, but it looks
to have only covered SDCC2 clock.

Fixes: 9607f6224b39 ("clk: qcom: ipq8074: add PCIE, USB and SDCC clocks")

Signed-off-by: Dirk Buchwalder <buchwalder@...teo.de>
Signed-off-by: Robert Marko <robimarko@...il.com>
---
 drivers/clk/qcom/gcc-ipq8074.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/gcc-ipq8074.c b/drivers/clk/qcom/gcc-ipq8074.c
index 1e493f19fa44..c24e33321f72 100644
--- a/drivers/clk/qcom/gcc-ipq8074.c
+++ b/drivers/clk/qcom/gcc-ipq8074.c
@@ -1074,7 +1074,7 @@ static struct clk_rcg2 sdcc1_apps_clk_src = {
 		.name = "sdcc1_apps_clk_src",
 		.parent_names = gcc_xo_gpll0_gpll2_gpll0_out_main_div2,
 		.num_parents = 4,
-		.ops = &clk_rcg2_ops,
+		.ops = &clk_rcg2_floor_ops,
 	},
 };
 
-- 
2.35.1