[PATCH AUTOSEL 5.2 04/85] clk: meson: mpll: properly handle spread spectrum

Sasha Levin sashal at kernel.org
Fri Jul 26 06:38:14 PDT 2019


From: Jerome Brunet <jbrunet at baylibre.com>

[ Upstream commit f9b3eeebef6aabaa37a351715374de53b6da860c ]

The bit 'SSEN' available on some MPLL DSS outputs is not related to the
fractional part of the divider but to the function called
'Spread Spectrum'.

This function might be used to solve EM issues by adding a jitter on
clock signal. This widens the signal spectrum and weakens the peaks in it.

While spread spectrum might be useful for some application, it is
problematic for others, such as audio.

This patch introduce a new flag to the MPLL driver to enable (or not) the
spread spectrum function.

Fixes: 1f737ffa13ef ("clk: meson: mpll: fix mpll0 fractional part ignored")
Tested-by: Martin Blumenstingl<martin.blumenstingl at googlemail.com>
Signed-off-by: Jerome Brunet <jbrunet at baylibre.com>
Signed-off-by: Sasha Levin <sashal at kernel.org>
---
 drivers/clk/meson/clk-mpll.c | 9 ++++++---
 drivers/clk/meson/clk-mpll.h | 1 +
 2 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/meson/clk-mpll.c b/drivers/clk/meson/clk-mpll.c
index f76850d99e59..d3f42e086431 100644
--- a/drivers/clk/meson/clk-mpll.c
+++ b/drivers/clk/meson/clk-mpll.c
@@ -119,9 +119,12 @@ static int mpll_set_rate(struct clk_hw *hw,
 	meson_parm_write(clk->map, &mpll->sdm, sdm);
 	meson_parm_write(clk->map, &mpll->sdm_en, 1);
 
-	/* Set additional fractional part enable if required */
-	if (MESON_PARM_APPLICABLE(&mpll->ssen))
-		meson_parm_write(clk->map, &mpll->ssen, 1);
+	/* Set spread spectrum if possible */
+	if (MESON_PARM_APPLICABLE(&mpll->ssen)) {
+		unsigned int ss =
+			mpll->flags & CLK_MESON_MPLL_SPREAD_SPECTRUM ? 1 : 0;
+		meson_parm_write(clk->map, &mpll->ssen, ss);
+	}
 
 	/* Set the integer divider part */
 	meson_parm_write(clk->map, &mpll->n2, n2);
diff --git a/drivers/clk/meson/clk-mpll.h b/drivers/clk/meson/clk-mpll.h
index cf79340006dd..0f948430fed4 100644
--- a/drivers/clk/meson/clk-mpll.h
+++ b/drivers/clk/meson/clk-mpll.h
@@ -23,6 +23,7 @@ struct meson_clk_mpll_data {
 };
 
 #define CLK_MESON_MPLL_ROUND_CLOSEST	BIT(0)
+#define CLK_MESON_MPLL_SPREAD_SPECTRUM	BIT(1)
 
 extern const struct clk_ops meson_clk_mpll_ro_ops;
 extern const struct clk_ops meson_clk_mpll_ops;
-- 
2.20.1




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