[Intel-gfx] [PATCH 09/39] drm/i915: move and group gmbus members under display.gmbus
Murthy, Arun R
arun.r.murthy at intel.com
Tue Aug 16 08:04:21 UTC 2022
> -----Original Message-----
> From: Nikula, Jani <jani.nikula at intel.com>
> Sent: Tuesday, August 16, 2022 1:21 PM
> To: Murthy, Arun R <arun.r.murthy at intel.com>; intel-
> gfx at lists.freedesktop.org
> Cc: De Marchi, Lucas <lucas.demarchi at intel.com>
> Subject: RE: [Intel-gfx] [PATCH 09/39] drm/i915: move and group gmbus
> members under display.gmbus
>
> On Tue, 16 Aug 2022, "Murthy, Arun R" <arun.r.murthy at intel.com> wrote:
> >> -----Original Message-----
> >> From: Nikula, Jani <jani.nikula at intel.com>
> >> Sent: Friday, August 12, 2022 12:26 PM
> >> To: Murthy, Arun R <arun.r.murthy at intel.com>; intel-
> >> gfx at lists.freedesktop.org
> >> Cc: De Marchi, Lucas <lucas.demarchi at intel.com>
> >> Subject: RE: [Intel-gfx] [PATCH 09/39] drm/i915: move and group gmbus
> >> members under display.gmbus
> >>
> >> On Fri, 12 Aug 2022, "Murthy, Arun R" <arun.r.murthy at intel.com> wrote:
> >> >> -----Original Message-----
> >> >> From: Intel-gfx <intel-gfx-bounces at lists.freedesktop.org> On
> >> >> Behalf Of Jani Nikula
> >> >> Sent: Thursday, August 11, 2022 8:37 PM
> >> >> To: intel-gfx at lists.freedesktop.org
> >> >> Cc: Nikula, Jani <jani.nikula at intel.com>; De Marchi, Lucas
> >> >> <lucas.demarchi at intel.com>
> >> >> Subject: [Intel-gfx] [PATCH 09/39] drm/i915: move and group gmbus
> >> >> members under display.gmbus
> >> >>
> >> >> Move display related members under drm_i915_private display sub-
> >> struct.
> >> >>
> >> >> Signed-off-by: Jani Nikula <jani.nikula at intel.com>
> >> >> ---
> >> >> drivers/gpu/drm/i915/display/intel_cdclk.c | 6 +--
> >> >> .../gpu/drm/i915/display/intel_display_core.h | 23 ++++++++++
> >> >> drivers/gpu/drm/i915/display/intel_dp_aux.c | 2 +-
> >> >> drivers/gpu/drm/i915/display/intel_gmbus.c | 46 +++++++++----------
> >> >> drivers/gpu/drm/i915/i915_drv.h | 16 -------
> >> >> drivers/gpu/drm/i915/i915_irq.c | 4 +-
> >> >> drivers/gpu/drm/i915/i915_reg.h | 14 +++---
> >> >> 7 files changed, 59 insertions(+), 52 deletions(-)
> >> >>
> >> >> diff --git a/drivers/gpu/drm/i915/display/intel_cdclk.c
> >> >> b/drivers/gpu/drm/i915/display/intel_cdclk.c
> >> >> index 6095f5800a2e..ea40c75c2986 100644
> >> >> --- a/drivers/gpu/drm/i915/display/intel_cdclk.c
> >> >> +++ b/drivers/gpu/drm/i915/display/intel_cdclk.c
> >> >> @@ -2098,12 +2098,12 @@ static void intel_set_cdclk(struct
> >> >> drm_i915_private *dev_priv,
> >> >> * functions use cdclk. Not all platforms/ports do,
> >> >> * but we'll lock them all for simplicity.
> >> >> */
> >> >> - mutex_lock(&dev_priv->gmbus_mutex);
> >> >> + mutex_lock(&dev_priv->display.gmbus.mutex);
> >> >> for_each_intel_dp(&dev_priv->drm, encoder) {
> >> >> struct intel_dp *intel_dp =
> >> >> enc_to_intel_dp(encoder);
> >> >>
> >> >> mutex_lock_nest_lock(&intel_dp->aux.hw_mutex,
> >> >> - &dev_priv->gmbus_mutex);
> >> >> +
> >> >> + &dev_priv->display.gmbus.mutex);
> >> >> }
> >> >>
> >> >> intel_cdclk_set_cdclk(dev_priv, cdclk_config, pipe); @@
> >> >> -2113,7
> >> >> +2113,7 @@ static void intel_set_cdclk(struct drm_i915_private
> >> >> +*dev_priv,
> >> >>
> >> >> mutex_unlock(&intel_dp->aux.hw_mutex);
> >> >> }
> >> >> - mutex_unlock(&dev_priv->gmbus_mutex);
> >> >> + mutex_unlock(&dev_priv->display.gmbus.mutex);
> >> >>
> >> >> for_each_intel_encoder_with_psr(&dev_priv->drm, encoder) {
> >> >> struct intel_dp *intel_dp =
> >> >> enc_to_intel_dp(encoder); diff -- git
> >> >> a/drivers/gpu/drm/i915/display/intel_display_core.h
> >> >> b/drivers/gpu/drm/i915/display/intel_display_core.h
> >> >> index 306584c038c9..fe19d4f9a9ab 100644
> >> >> --- a/drivers/gpu/drm/i915/display/intel_display_core.h
> >> >> +++ b/drivers/gpu/drm/i915/display/intel_display_core.h
> >> >> @@ -6,7 +6,11 @@
> >> >> #ifndef __INTEL_DISPLAY_CORE_H__
> >> >> #define __INTEL_DISPLAY_CORE_H__
> >> >>
> >> >> +#include <linux/mutex.h>
> >> >> #include <linux/types.h>
> >> >> +#include <linux/wait.h>
> >> >> +
> >> >> +#include "intel_gmbus.h"
> >> >>
> >> >> struct drm_i915_private;
> >> >> struct intel_atomic_state;
> >> >> @@ -78,6 +82,25 @@ struct intel_display {
> >> >> /* Display internal color functions */
> >> >> const struct intel_color_funcs *color;
> >> >> } funcs;
> >> >> +
> >> >> + /* Grouping using anonymous structs. Keep sorted. */
> >> >> + struct {
> >> >> + /*
> >> >> + * Base address of where the gmbus and gpio blocks
> >> >> + are
> >> >> located
> >> >> + * (either on PCH or on SoC for platforms without PCH).
> >> >> + */
> >> >> + u32 mmio_base;
> >> >> +
> >> >> + /*
> >> >> + * gmbus.mutex protects against concurrent usage of
> >> >> + the
> >> >> single
> >> >> + * hw gmbus controller on different i2c buses.
> >> >> + */
> >> >> + struct mutex mutex;
> >> >> +
> >> >> + struct intel_gmbus *bus[GMBUS_NUM_PINS];
> >> >> +
> >> >> + wait_queue_head_t wait_queue;
> >> >> + } gmbus;
> >> >> };
> >> >
> >> > Can this be moved to struct intel_dp?
> >>
> >> Well, no. The data here is shared across all of them.
> >>
> > Then maybe we might need to think on this. I somehow feel having this
> under display wont look good. Since it's a low level bus communication, can
> be tagged under bus related to interface.
> > I agree from your other comments that this is just a first step to cleanup
> i915 and there is scope to cleanup further.
>
> As I've explained elsewhere, the "display" here should be taken to be very
> high level. Not "a display device", but "everything related to display
> hardware". Only display needs gmbus, nothing else.
>
> There may be further cleanups to be made, but this series has a very specific
> purpose of splitting the display parts to a display sub-struct of
> drm_i915_private. This is already 39 patches, it's not even complete on that
> target, so need to not lose focus here.
>
Totally agree, lets take it up later after this series gets merged.
Reviewed-by: Arun R Murthy <arun.r.murthy at intel.com>
Thanks and Regards,
Arun R Murthy
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