On Thu, 01 Jul 2021, Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx> wrote:
> On the dmc side,we maintain a lookup table with different display
> stepping-substepping combinations.
>
> Instead of adding new table for every new platform, lets ues
> the stepping info from RUNTIME_INFO(dev_priv)->step
>
> v2: Add stepping table for older platforms in intel_step.c (Lucas)
>
> Cc: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dmc.c | 117 +++++++++++++++--------
The changes here...
> drivers/gpu/drm/i915/intel_step.c | 41 ++++++++
> drivers/gpu/drm/i915/intel_step.h | 7 ++
...should be separate from, and depend on, the changes here. Please
don't try to do too much in one patch. Smaller is better.
> 3 files changed, 126 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dmc.c b/drivers/gpu/drm/i915/display/intel_dmc.c
> index f8789d4543bf..df888a3d086e 100644
> --- a/drivers/gpu/drm/i915/display/intel_dmc.c
> +++ b/drivers/gpu/drm/i915/display/intel_dmc.c
> @@ -247,50 +247,89 @@ bool intel_dmc_has_payload(struct drm_i915_private *i915)
> return i915->dmc.dmc_info[DMC_FW_MAIN].payload;
> }
>
> -static const struct stepping_info skl_stepping_info[] = {
> - {'A', '0'}, {'B', '0'}, {'C', '0'},
> - {'D', '0'}, {'E', '0'}, {'F', '0'},
> - {'G', '0'}, {'H', '0'}, {'I', '0'},
> - {'J', '0'}, {'K', '0'}
> -};
> -
> -static const struct stepping_info bxt_stepping_info[] = {
> - {'A', '0'}, {'A', '1'}, {'A', '2'},
> - {'B', '0'}, {'B', '1'}, {'B', '2'}
> -};
> -
> -static const struct stepping_info icl_stepping_info[] = {
> - {'A', '0'}, {'A', '1'}, {'A', '2'},
> - {'B', '0'}, {'B', '2'},
> - {'C', '0'}
> -};
> -
> static const struct stepping_info no_stepping_info = { '*', '*' };
> +struct stepping_info *display_step;
>
> -static const struct stepping_info *
> +static struct stepping_info *
> intel_get_stepping_info(struct drm_i915_private *dev_priv)
> {
> - const struct stepping_info *si;
> - unsigned int size;
> -
> - if (IS_ICELAKE(dev_priv)) {
> - size = ARRAY_SIZE(icl_stepping_info);
> - si = icl_stepping_info;
> - } else if (IS_SKYLAKE(dev_priv)) {
> - size = ARRAY_SIZE(skl_stepping_info);
> - si = skl_stepping_info;
> - } else if (IS_BROXTON(dev_priv)) {
> - size = ARRAY_SIZE(bxt_stepping_info);
> - si = bxt_stepping_info;
> - } else {
> - size = 0;
> - si = NULL;
> + struct intel_step_info step = RUNTIME_INFO(dev_priv)->step;
> +
> + switch (step.display_step) {
> + case STEP_A0:
> + display_step->stepping = 'A';
> + display_step->substepping = '0';
> + break;
> + case STEP_A1:
> + display_step->stepping = 'A';
> + display_step->substepping = '1';
> + break;
> + case STEP_A2:
> + display_step->stepping = 'A';
> + display_step->substepping = '2';
> + break;
> + case STEP_B0:
> + display_step->stepping = 'B';
> + display_step->substepping = '0';
> + break;
> + case STEP_B1:
> + display_step->stepping = 'B';
> + display_step->substepping = '1';
> + break;
> + case STEP_B2:
> + display_step->stepping = 'B';
> + display_step->substepping = '2';
> + break;
> + case STEP_C0:
> + display_step->stepping = 'C';
> + display_step->substepping = '0';
> + break;
> + case STEP_C1:
> + display_step->stepping = 'C';
> + display_step->substepping = '1';
> + break;
> + case STEP_D0:
> + display_step->stepping = 'D';
> + display_step->substepping = '0';
> + break;
> + case STEP_D1:
> + display_step->stepping = 'D';
> + display_step->substepping = '1';
> + break;
> + case STEP_E0:
> + display_step->stepping = 'E';
> + display_step->substepping = '0';
> + break;
> + case STEP_F0:
> + display_step->stepping = 'F';
> + display_step->substepping = '0';
> + break;
> + case STEP_G0:
> + display_step->stepping = 'G';
> + display_step->substepping = '0';
> + break;
> + case STEP_H0:
> + display_step->stepping = 'H';
> + display_step->substepping = '0';
> + break;
> + case STEP_I0:
> + display_step->stepping = 'I';
> + display_step->substepping = '0';
> + break;
> + case STEP_J0:
> + display_step->stepping = 'J';
> + display_step->substepping = '0';
> + break;
> + case STEP_K0:
> + display_step->stepping = 'K';
> + display_step->substepping = '0';
> + break;
> + default:
> + display_step->stepping = '*';
> + display_step->substepping = '*';
> + break;
> }
> -
> - if (INTEL_REVID(dev_priv) < size)
> - return si + INTEL_REVID(dev_priv);
> -
> - return &no_stepping_info;
> + return display_step;
> }
>
> static void gen9_set_dc_state_debugmask(struct drm_i915_private *dev_priv)
> diff --git a/drivers/gpu/drm/i915/intel_step.c b/drivers/gpu/drm/i915/intel_step.c
> index ba9479a67521..c8542161c5d0 100644
> --- a/drivers/gpu/drm/i915/intel_step.c
> +++ b/drivers/gpu/drm/i915/intel_step.c
> @@ -15,6 +15,38 @@
>
>
> /* FIXME: what about REVID_E0 */
So that comment was next to kbl_revids, and this makes it meaningless.
> +static const struct intel_step_info bxt_revid_step_tbl[] = {
Please just call them "bxt_revids" or "bxt_steps" or something simple. I
meant to clean up all the other names too, they're a bit excessive.
> + [0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
> + [1] = { .gt_step = STEP_A1, .display_step = STEP_A1 },
> + [2] = { .gt_step = STEP_A2, .display_step = STEP_A2 },
> + [6] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
> + [7] = { .gt_step = STEP_B1, .display_step = STEP_B1 },
> + [8] = { .gt_step = STEP_B2, .display_step = STEP_B2 },
> +};
We might want to add something like this:
@@ -112,5 +112,8 @@ void intel_step_init(struct drm_i915_private *i915)
if (drm_WARN_ON(&i915->drm, step.gt_step == STEP_NONE))
return;
+ if (step.display_step == STEP_NONE)
+ step.display_step = step.gt_step;
+
RUNTIME_INFO(i915)->step = step;
}
So that we could just initialize .gt_step when the .display_step matches
the .gt_step, and we could avoid the repetition. This wasn't useful for
the platforms currently added, because they actually have the
differences.
This can also be left for future cleanup.
> +
> +
Superfluous newline.
> +static const struct intel_step_info skl_revid_step_tbl[] = {
> + [0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
> + [1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
> + [2] = { .gt_step = STEP_C0, .display_step = STEP_C0 },
> + [3] = { .gt_step = STEP_D0, .display_step = STEP_D0 },
> + [4] = { .gt_step = STEP_E0, .display_step = STEP_E0 },
> + [5] = { .gt_step = STEP_F0, .display_step = STEP_F0 },
> + [6] = { .gt_step = STEP_G0, .display_step = STEP_G0 },
> + [7] = { .gt_step = STEP_H0, .display_step = STEP_H0 },
> + [8] = { .gt_step = STEP_I0, .display_step = STEP_I0 },
> + [9] = { .gt_step = STEP_J0, .display_step = STEP_J0 },
skl_stepping_info in intel_dmc.c has K0, this one doesn't.
> +};
> +
> +static const struct intel_step_info icl_revid_step_tbl[] = {
> + [0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
> + [3] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
> + [4] = { .gt_step = STEP_B2, .display_step = STEP_B2 },
> + [5] = { .gt_step = STEP_C0, .display_step = STEP_C0 },
> + [6] = { .gt_step = STEP_C1, .display_step = STEP_C1 },
> + [7] = { .gt_step = STEP_D0, .display_step = STEP_D0 },
icl_stepping_info in intel_dmc.c has A1 and A2, this one doesn't. This
one has C1 and D0, the one in intel_dmc.c doesn't.
> +};
> +
> static const struct intel_step_info kbl_revids[] = {
> [0] = { .gt_step = STEP_A0, .display_step = STEP_A0 },
> [1] = { .gt_step = STEP_B0, .display_step = STEP_B0 },
> @@ -76,6 +108,15 @@ void intel_step_init(struct drm_i915_private *i915)
> } else if (IS_KABYLAKE(i915)) {
> revids = kbl_revids;
> size = ARRAY_SIZE(kbl_revids);
> + } else if (IS_ICELAKE(i915)) {
> + revids = icl_revid_step_tbl;
> + size = ARRAY_SIZE(icl_revid_step_tbl);
> + } else if (IS_SKYLAKE(i915)) {
> + revids = skl_revid_step_tbl;
> + size = ARRAY_SIZE(skl_revid_step_tbl);
> + } else if (IS_BROXTON(i915)) {
> + revids = bxt_revid_step_tbl;
> + size = ARRAY_SIZE(bxt_revid_step_tbl);
Doing this should be accompanied by:
* Removing *all* ICL_REVID_*, SKL_REVID_* and BXT_REVID_* macros from
i915_drv.h.
* Converting IS_ICL_REVID(), IS_SKL_REVID(), and IS_BXT_REVID() to
IS_{ICL,SKL,KBL}_{GT,DISPLAY}_STEP().
* And making their references use the generic STEP_* macros.
These changes should probably be done on a platform by platform basis,
just in case we hit any issues. This needs to be trivial to bisect and
backtrack as needed.
We currently have two schemes just for transition; we do not want to
have two schemes for a single platform effective at the same time.
BR,
Jani.
> }
>
> /* Not using the stepping scheme for the platform yet. */
> diff --git a/drivers/gpu/drm/i915/intel_step.h b/drivers/gpu/drm/i915/intel_step.h
> index 958a8bb5d677..1bffa41f2660 100644
> --- a/drivers/gpu/drm/i915/intel_step.h
> +++ b/drivers/gpu/drm/i915/intel_step.h
> @@ -22,15 +22,22 @@ struct intel_step_info {
> enum intel_step {
> STEP_NONE = 0,
> STEP_A0,
> + STEP_A1,
> STEP_A2,
> STEP_B0,
> STEP_B1,
> + STEP_B2,
> STEP_C0,
> + STEP_C1,
> STEP_D0,
> STEP_D1,
> STEP_E0,
> STEP_F0,
> STEP_G0,
> + STEP_H0,
> + STEP_I0,
> + STEP_J0,
> + STEP_K0,
> STEP_FUTURE,
> STEP_FOREVER,
> };
--
Jani Nikula, Intel Open Source Graphics Center
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