On Fri, Mar 08, 2024 at 01:00:38PM +0200, Jouni Högander wrote:
> IO buffer wake time used for IO wake calculation is dependent on port clock
> on LunarLake and beyond. Take this into account in get_io_buffer_wake_time.
>
> Bspec: 65450
>
> v2: add own io_wake_time helper for LunarLake
>
> Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_psr.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 747761efa4be..e3daaf05d640 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -1165,11 +1165,23 @@ static int tgl_io_buffer_wake_time(void)
> return 10;
> }
>
> +static int lnl_io_buffer_wake_time(int port_clock)
> +{
> + if (port_clock > 270000)
> + return 10;
> + else if (port_clock > 162000)
> + return 11;
> + else
> + return 15;
> +}
These numbers are only listed in the MTL section of bspec. There
is nothing like this in the LNL PHY power section AFAICS.
> +
> static int io_buffer_wake_time(const struct intel_crtc_state *crtc_state)
> {
> struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
>
> - if (DISPLAY_VER(i915) >= 12)
> + if (DISPLAY_VER(i915) >= 20)
> + return lnl_io_buffer_wake_time(crtc_state->port_clock);
> + else if (DISPLAY_VER(i915) >= 12)
> return tgl_io_buffer_wake_time();
> else
> return skl_io_buffer_wake_time();
> --
> 2.34.1
--
Ville Syrjälä
Intel
