From bf83b96f87ae2abb1e535306ea53608e8de5dfbb Mon Sep 17 00:00:00 2001 From: Stephen Warren Date: Thu, 3 Oct 2019 14:50:30 -0600 Subject: [PATCH] clk: tegra: Mark fuse clock as critical For a little over a year, U-Boot on Tegra124 has configured the flow controller to perform automatic RAM re-repair on off->on power transitions of the CPU rail[1]. This is mandatory for correct operation of Tegra124. However, RAM re-repair relies on certain clocks, which the kernel must enable and leave running. The fuse clock is one of those clocks. Mark this clock as critical so that LP1 power mode (system suspend) operates correctly. [1] 3cc7942a4ae5 ARM: tegra: implement RAM repair Reported-by: Jonathan Hunter Cc: stable@vger.kernel.org Signed-off-by: Stephen Warren Signed-off-by: Thierry Reding --- drivers/clk/tegra/clk-tegra-periph.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/clk/tegra/clk-tegra-periph.c b/drivers/clk/tegra/clk-tegra-periph.c index 0d07c0ba49b6..2b2a3b81c16b 100644 --- a/drivers/clk/tegra/clk-tegra-periph.c +++ b/drivers/clk/tegra/clk-tegra-periph.c @@ -777,7 +777,11 @@ static struct tegra_periph_init_data gate_clks[] = { GATE("ahbdma", "hclk", 33, 0, tegra_clk_ahbdma, 0), GATE("apbdma", "pclk", 34, 0, tegra_clk_apbdma, 0), GATE("kbc", "clk_32k", 36, TEGRA_PERIPH_ON_APB | TEGRA_PERIPH_NO_RESET, tegra_clk_kbc, 0), - GATE("fuse", "clk_m", 39, TEGRA_PERIPH_ON_APB, tegra_clk_fuse, 0), + /* + * Critical for RAM re-repair operation, which must occur on resume + * from LP1 system suspend and as part of CCPLEX cluster switching. + */ + GATE("fuse", "clk_m", 39, TEGRA_PERIPH_ON_APB, tegra_clk_fuse, CLK_IS_CRITICAL), GATE("fuse_burn", "clk_m", 39, TEGRA_PERIPH_ON_APB, tegra_clk_fuse_burn, 0), GATE("kfuse", "clk_m", 40, TEGRA_PERIPH_ON_APB, tegra_clk_kfuse, 0), GATE("apbif", "clk_m", 107, TEGRA_PERIPH_ON_APB, tegra_clk_apbif, 0),