[Intel-gfx] [PATCH v6 2/3] drm/i915 : Changing intel_connector iterators
Jani Nikula
jani.nikula at intel.com
Thu Oct 20 08:53:19 UTC 2022
On Thu, 20 Oct 2022, "Kandpal, Suraj" <suraj.kandpal at intel.com> wrote:
>> > diff --git a/drivers/gpu/drm/i915/display/intel_acpi.c
>> > b/drivers/gpu/drm/i915/display/intel_acpi.c
>> > index 9df78e7caa2b..912fe5c2ffe5 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_acpi.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_acpi.c
>> > @@ -349,8 +349,13 @@ void intel_acpi_video_register(struct
>> drm_i915_private *i915)
>> > */
>> > drm_connector_list_iter_begin(&i915->drm, &conn_iter);
>> > drm_for_each_connector_iter(connector, &conn_iter) {
>> > - struct intel_panel *panel = &to_intel_connector(connector)-
>> >panel;
>> > + struct intel_panel *panel;
>> > + struct intel_connector *intel_connector =
>> > + to_intel_connector(connector);
>> >
>> > + if (!intel_connector)
>> > + continue;
>> > + panel = &intel_connector->panel;
>> > if (panel->backlight.funcs && !panel->backlight.device) {
>> > acpi_video_register_backlight();
>> > break;
>> > diff --git a/drivers/gpu/drm/i915/display/intel_display.h
>> > b/drivers/gpu/drm/i915/display/intel_display.h
>> > index a1ed9c82e2ed..102bf7d47ccc 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_display.h
>> > +++ b/drivers/gpu/drm/i915/display/intel_display.h
>> > @@ -52,6 +52,7 @@ struct intel_crtc_state; struct intel_digital_port;
>> > struct intel_dp; struct intel_encoder;
>> > +struct intel_connector;
>> > struct intel_initial_plane_config;
>> > struct intel_load_detect_pipe;
>> > struct intel_plane;
>> > @@ -469,16 +470,12 @@ enum hpd_pin {
>> > for_each_if(intel_encoder_can_psr(intel_encoder))
>> >
>> > #define for_each_intel_connector_iter(intel_connector, iter) \
>> > - while ((intel_connector =
>> to_intel_connector(drm_connector_list_iter_next(iter))))
>> > + while ((intel_connector = intel_connector_list_iter_next(iter)))
>> >
>> > #define for_each_encoder_on_crtc(dev, __crtc, intel_encoder) \
>> > list_for_each_entry((intel_encoder), &(dev)-
>> >mode_config.encoder_list, base.head) \
>> > for_each_if((intel_encoder)->base.crtc == (__crtc))
>> >
>> > -#define for_each_connector_on_encoder(dev, __encoder,
>> intel_connector) \
>> > - list_for_each_entry((intel_connector), &(dev)-
>> >mode_config.connector_list, base.head) \
>> > - for_each_if((intel_connector)->base.encoder ==
>> (__encoder))
>> > -
>>
>> Getting rid of this macro should be a separate change. As the first patch,
>> could've been merged already.
>>
> Hi Jani,
> This change has no dependency on the last patch as the only place this is called (intel_encoder_find_connector)
> Is also being fixed in this patch itself so creating a new patch for this may not be necessary
It's a good idea no matter what to get rid of this single use macro, so
please just send a patch for it separately, and get it merged.
BR,
Jani.
>
> Regards,
> Suraj Kandpal
>> > #define for_each_old_intel_plane_in_state(__state, plane,
>> old_plane_state, __i) \
>> > for ((__i) = 0; \
>> > (__i) < (__state)->base.dev->mode_config.num_total_plane && \
>> > diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
>> > b/drivers/gpu/drm/i915/display/intel_display_types.h
>> > index 633cacd79074..a2d294929a64 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_display_types.h
>> > +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
>> > @@ -1498,12 +1498,14 @@ struct cxsr_latency { #define
>> > to_intel_atomic_state(x) container_of(x, struct intel_atomic_state,
>> > base) #define to_intel_crtc(x) container_of(x, struct intel_crtc,
>> > base) #define to_intel_crtc_state(x) container_of(x, struct
>> > intel_crtc_state, uapi) -#define to_intel_connector(x) container_of(x,
>> > struct intel_connector, base)
>> > +#define to_intel_wb_connector(x) container_of(x, struct
>> > +intel_wb_connector, base)
>>
>> Note that all of the macros here are sorted alphabetically.
>>
>> The wb/wd difference is a pretty bad eyesore. Maybe we should use one or
>> the other, not mix them. (Except if we go with writeback, leave the register
>> macros WD because that's what they are.)
>>
>> > #define to_intel_encoder(x) container_of(x, struct intel_encoder,
>> > base) #define to_intel_framebuffer(x) container_of(x, struct
>> > intel_framebuffer, base) #define to_intel_plane(x) container_of(x,
>> > struct intel_plane, base) #define to_intel_plane_state(x)
>> > container_of(x, struct intel_plane_state, uapi) #define
>> > intel_fb_obj(x) ((x) ? to_intel_bo((x)->obj[0]) : NULL)
>> > +#define to_intel_connector(x) (((x->connector_type ==
>> DRM_MODE_CONNECTOR_WRITEBACK)) ? \
>> > + NULL : container_of(x, struct
>> intel_connector, base))
>>
>> Would need to have (x)->connector_type, with parenthesis.
>>
>> The problem with this is that we currently have 131 uses of
>> to_intel_connector() and practically all of them expect to get non-NULL
>> result.
>>
>> You're going to get 131 static analyzer reports that you don't check for
>> NULL. You can't check for NULL in most places, because they're in the
>> middle of local parameter initialization.
>>
>> >
>> > struct intel_hdmi {
>> > i915_reg_t hdmi_reg;
>> > @@ -2069,4 +2071,26 @@ to_intel_frontbuffer(struct drm_framebuffer
>> *fb)
>> > return fb ? to_intel_framebuffer(fb)->frontbuffer : NULL; }
>> >
>> > +static inline struct intel_connector *
>> > +intel_connector_list_iter_next(struct drm_connector_list_iter *iter)
>> > +{
>> > + struct drm_connector *connector;
>> > + bool flag = true;
>> > + /*
>> > + * Skipping connector that are Writeback connector as they will
>> > + * not be embedded in intel connector
>> > + */
>> > + while (flag) {
>> > + connector = drm_connector_list_iter_next(iter);
>> > + if (connector && !to_intel_connector(connector))
>> > + continue;
>> > +
>> > + flag = false;
>> > +
>> > + if (connector)
>> > + return to_intel_connector(connector);
>> > +
>> > + }
>> > + return NULL;
>> > +}
>>
>> This gets pretty ugly. I've got an idea, I'll send patches later today.
>>
>> Code is worth a thousand words, it's easier to explain that way.
>>
>> BR,
>> Jani.
>>
>> > #endif /* __INTEL_DISPLAY_TYPES_H__ */ diff --git
>> > a/drivers/gpu/drm/i915/display/intel_modeset_setup.c
>> > b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
>> > index cbfabd58b75a..e1a90331c230 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_modeset_setup.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_modeset_setup.c
>> > @@ -205,12 +205,22 @@ static bool intel_crtc_has_encoders(struct
>> > intel_crtc *crtc)
>> >
>> > static struct intel_connector *intel_encoder_find_connector(struct
>> > intel_encoder *encoder) {
>> > - struct drm_device *dev = encoder->base.dev;
>> > + struct drm_i915_private *i915 = to_i915(encoder->base.dev);
>> > struct intel_connector *connector;
>> > + struct drm_connector_list_iter conn_iter;
>> > + bool found_connector = false;
>> >
>> > - for_each_connector_on_encoder(dev, &encoder->base, connector)
>> > - return connector;
>> > + drm_connector_list_iter_begin(&i915->drm, &conn_iter);
>> > + for_each_intel_connector_iter(connector, &conn_iter) {
>> > + if (&encoder->base == connector->base.encoder) {
>> > + found_connector = true;
>> > + break;
>> > + }
>> > + }
>> > + drm_connector_list_iter_end(&conn_iter);
>> >
>> > + if (found_connector)
>> > + return connector;
>> > return NULL;
>> > }
>>
>> --
>> Jani Nikula, Intel Open Source Graphics Center
--
Jani Nikula, Intel Open Source Graphics Center
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