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SubjectRe: [PATCH] mmc: tegra: Add Runtime PM callbacks
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27.07.2020 15:47, Aniruddha Rao пишет:
> Add runtime suspend/resume callbacks to save power
> when the bus is not in use.
> In runtime suspend
> - Turn off the SDMMC host CAR clock.
> - Turn off the trimmer/DLL circuit(BG) power supply(VREG).
> - Turn off the SDMMC host internal clocks.
>
> Re-enable all the disabled clocks/regulators in runtime resume.
>
> Signed-off-by: Aniruddha Rao <anrao@nvidia.com>
> ---
> drivers/mmc/host/sdhci-tegra.c | 149 ++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 140 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
> index 0a3f9d0..1b4b245 100644
> --- a/drivers/mmc/host/sdhci-tegra.c
> +++ b/drivers/mmc/host/sdhci-tegra.c
> @@ -23,6 +23,7 @@
> #include <linux/mmc/slot-gpio.h>
> #include <linux/gpio/consumer.h>
> #include <linux/ktime.h>
> +#include <linux/pm_runtime.h>
>
> #include "sdhci-pltfm.h"
> #include "cqhci.h"
> @@ -36,6 +37,7 @@
> #define SDHCI_CLOCK_CTRL_SDR50_TUNING_OVERRIDE BIT(5)
> #define SDHCI_CLOCK_CTRL_PADPIPE_CLKEN_OVERRIDE BIT(3)
> #define SDHCI_CLOCK_CTRL_SPI_MODE_CLKEN_OVERRIDE BIT(2)
> +#define SDHCI_CLOCK_CTRL_SDMMC_CLK BIT(0)
>
> #define SDHCI_TEGRA_VENDOR_SYS_SW_CTRL 0x104
> #define SDHCI_TEGRA_SYS_SW_CTRL_ENHANCED_STROBE BIT(31)
> @@ -51,6 +53,9 @@
> #define SDHCI_MISC_CTRL_ENABLE_SDHCI_SPEC_300 0x20
> #define SDHCI_MISC_CTRL_ENABLE_DDR50 0x200
>
> +#define SDHCI_TEGRA_VENDOR_IO_TRIM_CTRL_0 0x1AC
> +#define SDHCI_TEGRA_IO_TRIM_CTRL_0_SEL_VREG_MASK 0x4

Hello Aniruddha,

Does this register exist on older Tegra SoCs?

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