On Mon, Oct 30, 2017 at 4:03 AM, Vidya Sagar <vidyas@xxxxxxxxxx> wrote:
> adds API for host controller drivers to specify LTR L1.2
> threshold value if it is different from the default value.
> weak implementation of the API is added to supply default
> value
>
> Signed-off-by: Vidya Sagar <vidyas@xxxxxxxxxx>
> ---
> drivers/pci/pcie/aspm.c | 11 ++++++++---
> include/linux/pci-aspm.h | 6 ++++++
> 2 files changed, 14 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
> index 1dfa10cc566b..c6e8604796e5 100644
> --- a/drivers/pci/pcie/aspm.c
> +++ b/drivers/pci/pcie/aspm.c
> @@ -436,6 +436,11 @@ static struct pci_dev *pci_function_0(struct pci_bus *linkbus)
> return NULL;
> }
>
> +u32 __weak pcie_aspm_get_ltr_l_1_2_threshold(void)
> +{
> + return LTR_L1_2_THRESHOLD_BITS;
> +}
> +
> /* Calculate L1.2 PM substate timing parameters */
> static void aspm_calc_l1ss_info(struct pcie_link_state *link,
> struct aspm_register_info *upreg,
> @@ -458,10 +463,10 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link,
> else
> link->l1ss.ctl1 |= val2 << 8;
> /*
> - * We currently use LTR L1.2 threshold to be fixed constant picked from
> - * Intel's coreboot.
> + * Get LTR L1.2 threshold value specific to a platform if present
> + * Otherwise, get a constant value picked from Intel's coreboot.
> */
> - link->l1ss.ctl1 |= LTR_L1_2_THRESHOLD_BITS;
> + link->l1ss.ctl1 |= pcie_aspm_get_ltr_l_1_2_threshold();
>
> /* Choose the greater of the two T_pwr_on */
> val1 = (upreg->l1ss_cap >> 19) & 0x1F;
> diff --git a/include/linux/pci-aspm.h b/include/linux/pci-aspm.h
> index 207c561fb40e..7ffde0f57688 100644
> --- a/include/linux/pci-aspm.h
> +++ b/include/linux/pci-aspm.h
> @@ -30,6 +30,7 @@ void pcie_aspm_powersave_config_link(struct pci_dev *pdev);
> void pci_disable_link_state(struct pci_dev *pdev, int state);
> void pci_disable_link_state_locked(struct pci_dev *pdev, int state);
> void pcie_no_aspm(void);
> +u32 pcie_aspm_get_ltr_l_1_2_threshold(void);
> #else
> static inline void pcie_aspm_init_link_state(struct pci_dev *pdev)
> {
> @@ -49,6 +50,11 @@ static inline void pci_disable_link_state(struct pci_dev *pdev, int state)
> static inline void pcie_no_aspm(void)
> {
> }
> +
> +static inline u32 pcie_aspm_get_ltr_l_1_2_threshold(void)
> +{
> + return 0;
> +}
Do we really need this (bogus) function definition in
!defined(CONFIG_PCIEASPM) case? I believe the other bogus definitions
in that section are needed because functions outside of
CONFIG_PCIEASPM call it.
> #endif
>
> #ifdef CONFIG_PCIEASPM_DEBUG /* this depends on CONFIG_PCIEASPM */
> --
> 2.7.4
>
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