On Mon, 24 Feb 2025, Animesh Manna <animesh.ma...@intel.com> wrote:
> Add an interface in debugfs which will help in debugging LOBF
> feature.
>
> v1: Initial version.
> v2:
> - Remove FORCE_EN flag. [Jouni]
> - Change prefix from I915 to INTEL. [Jani]
> - Use u8 instead of bool for lobf-debug flag. [Jani]
>
> Signed-off-by: Animesh Manna <animesh.ma...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_alpm.c | 51 +++++++++++++++++++
> .../drm/i915/display/intel_display_types.h | 5 ++
> 2 files changed, 56 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c
> b/drivers/gpu/drm/i915/display/intel_alpm.c
> index 83719ee1721c..5c70677ac3c0 100644
> --- a/drivers/gpu/drm/i915/display/intel_alpm.c
> +++ b/drivers/gpu/drm/i915/display/intel_alpm.c
> @@ -276,6 +276,9 @@ void intel_alpm_lobf_compute_config(struct intel_dp
> *intel_dp,
> int waketime_in_lines, first_sdp_position;
> int context_latency, guardband;
>
> + if (intel_dp->alpm_parameters.lobf_debug & INTEL_LOBF_DEBUG_DISABLE)
> + return;
> +
> if (!intel_dp_is_edp(intel_dp))
> return;
>
> @@ -449,6 +452,51 @@ static int i915_edp_lobf_info_show(struct seq_file *m,
> void *data)
>
> DEFINE_SHOW_ATTRIBUTE(i915_edp_lobf_info);
>
> +static int
> +i915_edp_lobf_debug_get(void *data, u64 *val)
> +{
> + struct intel_display *display = data;
Where do you pass display as data? It's connector?
> + struct intel_encoder *encoder;
> + int ret = -ENODEV;
> +
> + for_each_intel_dp(display->drm, encoder) {
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
> + if (!intel_dp_is_edp(intel_dp))
> + return ret;
What is this supposed to do?
> +
> + // TODO: split to each edp transcoder.
What does this mean?
> + *val = READ_ONCE(intel_dp->alpm_parameters.lobf_debug);
You read this from all intel_dp and combine into one? What?
> + ret = 0;
> + }
> +
> + return ret;
> +}
> +
> +static int
> +i915_edp_lobf_debug_set(void *data, u64 val)
> +{
> + struct intel_display *display = data;
> + struct intel_encoder *encoder;
> + int ret = -ENODEV;
> +
> + for_each_intel_dp(display->drm, encoder) {
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> +
> + if (!intel_dp_is_edp(intel_dp))
> + return ret;
> +
> + // TODO: split to each edp transcoder.
> + intel_dp->alpm_parameters.lobf_debug = val;
> + }
> +
> + return ret;
So this always returns failure?
> +}
> +
> +DEFINE_SIMPLE_ATTRIBUTE(i915_edp_lobf_debug_fops,
> + i915_edp_lobf_debug_get, i915_edp_lobf_debug_set,
> + "%llu\n");
> +
> void intel_alpm_lobf_debugfs_add(struct intel_connector *connector)
> {
> struct intel_display *display = to_intel_display(connector);
> @@ -458,6 +506,9 @@ void intel_alpm_lobf_debugfs_add(struct intel_connector
> *connector)
> connector->base.connector_type != DRM_MODE_CONNECTOR_eDP)
> return;
>
> + debugfs_create_file("i915_edp_lobf_debug", 0644, root,
> + connector, &i915_edp_lobf_debug_fops);
> +
> debugfs_create_file("i915_edp_lobf_info", 0444, root,
> connector, &i915_edp_lobf_info_fops);
> }
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index b78721c451b8..b6ec9a8fadd9 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1808,6 +1808,11 @@ struct intel_dp {
> u8 aux_less_wake_lines;
> u8 silence_period_sym_clocks;
> u8 lfps_half_cycle_num_of_syms;
> +
> +#define INTEL_LOBF_DEBUG_MODE_MASK 0x0f
> +#define INTEL_LOBF_DEBUG_DEFAULT 0x00
> +#define INTEL_LOBF_DEBUG_DISABLE 0x01
> + u8 lobf_debug;
Just overly complex still.
> } alpm_parameters;
>
> u8 alpm_dpcd;
--
Jani Nikula, Intel
