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* [PATCH] clk: mmp2: avoid disabling the SP clock when unused
@ 2019-01-16  9:35 Lubomir Rintel
  2019-01-16 16:37 ` Stephen Boyd
  0 siblings, 1 reply; 6+ messages in thread
From: Lubomir Rintel @ 2019-01-16  9:35 UTC (permalink / raw)
  To: Michael Turquette, Stephen Boyd
  Cc: linux-clk, linux-kernel, Lubomir Rintel, stable

There could be vital functionality running on the SP PJ1 core it can not be
restarted just by turning the clock back on.

On the OLPC laptop, the keyboard controller code runs there. It
wouldn't be possible to load the driver for it as a module if the clock
is disabled on boot.

Cc: # v4.18+
Fixes: commit fc27c2394d96 ("clk: mmp2: add SP clock")
Signed-off-by: Lubomir Rintel <>
 drivers/clk/mmp/clk-of-mmp2.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/mmp/clk-of-mmp2.c b/drivers/clk/mmp/clk-of-mmp2.c
index f2a1c9bbaa63..3e33f1295f59 100644
--- a/drivers/clk/mmp/clk-of-mmp2.c
+++ b/drivers/clk/mmp/clk-of-mmp2.c
@@ -246,7 +246,7 @@ static struct mmp_param_gate_clk apmu_gate_clks[] = {
 	{MMP2_CLK_CCIC1, "ccic1_clk", "ccic1_mix_clk", CLK_SET_RATE_PARENT, APMU_CCIC1, 0x1b, 0x1b, 0x0, 0, &ccic1_lock},
 	{MMP2_CLK_CCIC1_PHY, "ccic1_phy_clk", "ccic1_mix_clk", CLK_SET_RATE_PARENT, APMU_CCIC1, 0x24, 0x24, 0x0, 0, &ccic1_lock},
 	{MMP2_CLK_CCIC1_SPHY, "ccic1_sphy_clk", "ccic1_sphy_div", CLK_SET_RATE_PARENT, APMU_CCIC1, 0x300, 0x300, 0x0, 0, &ccic1_lock},
-	{MMP2_CLK_SP, "sp_clk", NULL, CLK_SET_RATE_PARENT, APMU_SP, 0x1b, 0x1b, 0x0, 0, &sp_lock},
+	{MMP2_CLK_SP, "sp_clk", NULL, CLK_SET_RATE_PARENT | CLK_IGNORE_UNUSED, APMU_SP, 0x1b, 0x1b, 0x0, 0, &sp_lock},
 static void mmp2_axi_periph_clk_init(struct mmp2_clk_unit *pxa_unit)

^ permalink raw reply	[flat|nested] 6+ messages in thread

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Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2019-01-16  9:35 [PATCH] clk: mmp2: avoid disabling the SP clock when unused Lubomir Rintel
2019-01-16 16:37 ` Stephen Boyd
2019-01-16 17:26   ` Lubomir Rintel
2019-01-16 23:29     ` Stephen Boyd
2019-01-17  9:47       ` Lubomir Rintel
2019-01-18 17:31         ` Stephen Boyd

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