On Wed, 2020-05-20 at 15:14 +0100, Ben Hutchings wrote:
> 3.16.84-rc1 review patch. If anyone has any objections, please let me know.
>
> ------------------
>
> From: Stephen Warren <swarren@xxxxxxxxxx>
>
> commit bf83b96f87ae2abb1e535306ea53608e8de5dfbb upstream.
I've now dropped this, as CLK_IS_CRITICAL is not implemented on 3.16.
Ben.
> 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 <jonathanh@xxxxxxxxxx>
> Signed-off-by: Stephen Warren <swarren@xxxxxxxxxx>
> Signed-off-by: Thierry Reding <treding@xxxxxxxxxx>
> Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
> ---
> drivers/clk/tegra/clk-tegra-periph.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> --- a/drivers/clk/tegra/clk-tegra-periph.c
> +++ b/drivers/clk/tegra/clk-tegra-periph.c
> @@ -517,7 +517,11 @@ static struct tegra_periph_init_data gat
> GATE("vcp", "clk_m", 29, 0, tegra_clk_vcp, 0),
> GATE("apbdma", "clk_m", 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),
>
--
Ben Hutchings
All the simple programs have been written, and all the good names taken
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