On Mon, Oct 21, 2024 at 04:54:08PM +0300, Jani Nikula wrote:
> Facilitate using display->platform.haswell and
> display->platform.haswell_ult etc. for identifying platforms and
> subplatforms.
>
> Merge the platform and subplatform bitmaps together, and check that
> there's no overlap.
>
> v4:
> - Lower case, s/is/platform/
>
> v3:
> - Fix sanity check on display->is after merging subplatform members
>
> v2:
> - Use bitmap ops
> - Add some sanity checks with warnings
>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> ---
> .../gpu/drm/i915/display/intel_display_core.h | 3 ++
> .../drm/i915/display/intel_display_device.c | 35 +++++++++++++++++--
> 2 files changed, 36 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_display_core.h b/drivers/gpu/drm/i915/display/intel_display_core.h
> index 45697af25fa9..45b7c6900adc 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_core.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_core.h
> @@ -284,6 +284,9 @@ struct intel_display {
> /* drm device backpointer */
> struct drm_device *drm;
>
> + /* Platform (and subplatform, if any) identification */
> + struct intel_display_platforms platform;
> +
> /* Display functions */
> struct {
> /* Top level crtc-ish functions */
> diff --git a/drivers/gpu/drm/i915/display/intel_display_device.c b/drivers/gpu/drm/i915/display/intel_display_device.c
> index 0e835f714bf5..c124df204166 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_device.c
> +++ b/drivers/gpu/drm/i915/display/intel_display_device.c
> @@ -1525,6 +1525,25 @@ static enum intel_step get_pre_gmdid_step(struct intel_display *display,
> return step;
> }
>
> +/* Size of the entire bitmap, not the number of platforms */
> +static unsigned int display_platforms_num_bits(void)
> +{
> + return sizeof(((struct intel_display_platforms *)0)->bitmap) * BITS_PER_BYTE;
> +}
> +
> +/* Number of platform bits set */
> +static unsigned int display_platforms_weight(const struct intel_display_platforms *p)
> +{
> + return bitmap_weight(p->bitmap, display_platforms_num_bits());
> +}
> +
> +/* Merge the subplatform information from src to dst */
> +static void display_platforms_or(struct intel_display_platforms *dst,
> + const struct intel_display_platforms *src)
> +{
> + bitmap_or(dst->bitmap, dst->bitmap, src->bitmap, display_platforms_num_bits());
> +}
> +
> void intel_display_device_probe(struct drm_i915_private *i915)
> {
> struct intel_display *display = &i915->display;
> @@ -1564,13 +1583,25 @@ void intel_display_device_probe(struct drm_i915_private *i915)
> &DISPLAY_INFO(i915)->__runtime_defaults,
> sizeof(*DISPLAY_RUNTIME_INFO(i915)));
>
> - drm_WARN_ON(&i915->drm, !desc->platform || !desc->name);
> + drm_WARN_ON(&i915->drm, !desc->platform || !desc->name ||
> + !display_platforms_weight(&desc->platforms));
> DISPLAY_RUNTIME_INFO(i915)->platform = desc->platform;
>
> + display->platform = desc->platforms;
> +
> subdesc = find_subplatform_desc(pdev, desc);
> if (subdesc) {
> - drm_WARN_ON(&i915->drm, !subdesc->subplatform || !subdesc->name);
> + drm_WARN_ON(&i915->drm, !subdesc->subplatform || !subdesc->name ||
> + !display_platforms_weight(&subdesc->platforms));
> DISPLAY_RUNTIME_INFO(i915)->subplatform = subdesc->subplatform;
> +
> + display_platforms_or(&display->platform, &subdesc->platforms);
> +
> + /* Ensure platform and subplatform are distinct */
> + drm_WARN_ON(&i915->drm,
> + display_platforms_weight(&display->platform) !=
> + display_platforms_weight(&desc->platforms) +
> + display_platforms_weight(&subdesc->platforms));
> }
>
> if (ip_ver.ver || ip_ver.rel || ip_ver.step) {
> --
> 2.39.5
>
