4.18-stable review patch. If anyone has any objections, please let me know.
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From: Hans de Goede hdegoede@redhat.com
[ Upstream commit 648e921888ad96ea3dc922739e96716ad3225d7f ]
Commit d31fd43c0f9a ("clk: x86: Do not gate clocks enabled by the firmware"), which added the code to mark clocks as CLK_IS_CRITICAL, causes all unclaimed PMC clocks on Cherry Trail devices to be on all the time, resulting on the device not being able to reach S0i3 when suspended.
The reason for this commit is that on some Bay Trail / Cherry Trail devices the r8169 ethernet controller uses pmc_plt_clk_4. Now that the clk-pmc-atom driver exports an "ether_clk" alias for pmc_plt_clk_4 and the r8169 driver has been modified to get and enable this clock (if present) the marking of the clocks as CLK_IS_CRITICAL is no longer necessary.
This commit removes the CLK_IS_CRITICAL marking, fixing Cherry Trail devices not being able to reach S0i3 greatly decreasing their battery drain when suspended.
Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=193891#c102 Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=196861 Cc: Johannes Stezenbach js@sig21.net Cc: Carlo Caione carlo@endlessm.com Reported-by: Johannes Stezenbach js@sig21.net Reviewed-by: Andy Shevchenko andriy.shevchenko@linux.intel.com Acked-by: Stephen Boyd sboyd@kernel.org Signed-off-by: Hans de Goede hdegoede@redhat.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/clk/x86/clk-pmc-atom.c | 7 ------- 1 file changed, 7 deletions(-)
--- a/drivers/clk/x86/clk-pmc-atom.c +++ b/drivers/clk/x86/clk-pmc-atom.c @@ -187,13 +187,6 @@ static struct clk_plt *plt_clk_register( pclk->reg = base + PMC_CLK_CTL_OFFSET + id * PMC_CLK_CTL_SIZE; spin_lock_init(&pclk->lock);
- /* - * If the clock was already enabled by the firmware mark it as critical - * to avoid it being gated by the clock framework if no driver owns it. - */ - if (plt_clk_is_enabled(&pclk->hw)) - init.flags |= CLK_IS_CRITICAL; - ret = devm_clk_hw_register(&pdev->dev, &pclk->hw); if (ret) { pclk = ERR_PTR(ret);