> -----Original Message-----
> From: Kandpal, Suraj <suraj.kand...@intel.com>
> Sent: Wednesday, November 20, 2024 3:55 PM
> To: Murthy, Arun R <arun.r.mur...@intel.com>; intel...@lists.freedesktop.org;
> intel-...@lists.freedesktop.org; dri-devel@lists.freedesktop.org
> Cc: Murthy, Arun R <arun.r.mur...@intel.com>
> Subject: RE: [PATCHv4 7/8] drm/i915/histogram: Histogram changes for Display
> 20+
>
>
>
> > -----Original Message-----
> > From: Intel-xe <intel-xe-boun...@lists.freedesktop.org> On Behalf Of
> > Arun R Murthy
> > Sent: Tuesday, November 19, 2024 4:15 PM
> > To: intel...@lists.freedesktop.org; intel-...@lists.freedesktop.org;
> > dri- de...@lists.freedesktop.org
> > Cc: Murthy, Arun R <arun.r.mur...@intel.com>
> > Subject: [PATCHv4 7/8] drm/i915/histogram: Histogram changes for
> > Display
> > 20+
> >
> > In Display 20+, new registers are added for setting index, reading
> > histogram and writing the IET.
>
> Bspec reference for new registers being added please
>
> >
> > v2: Removed duplicate code (Jani)
> > v3: Moved histogram core changes to earlier patches (Jani/Suraj)
> > v4: Rebased after addressing comments on patch 1
> >
> > Signed-off-by: Arun R Murthy <arun.r.mur...@intel.com>
> > ---
> > .../gpu/drm/i915/display/intel_histogram.c | 111 +++++++++++++-----
> > .../drm/i915/display/intel_histogram_regs.h | 25 ++++
> > 2 files changed, 105 insertions(+), 31 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_histogram.c
> > b/drivers/gpu/drm/i915/display/intel_histogram.c
> > index fdcc64677e96..beaad9256e01 100644
> > --- a/drivers/gpu/drm/i915/display/intel_histogram.c
> > +++ b/drivers/gpu/drm/i915/display/intel_histogram.c
> > @@ -29,6 +29,51 @@ struct intel_histogram {
> > u32 bin_data[HISTOGRAM_BIN_COUNT];
> > };
> >
> > +static void set_bin_index_0(struct intel_display *display, enum pipe
> > +pipe) {
> > + if (DISPLAY_VER(display) >= 20)
> > + intel_de_rmw(display, DPST_IE_INDEX(pipe),
> > + DPST_IE_BIN_INDEX_MASK,
> > DPST_IE_BIN_INDEX(0));
> > + else
> > + intel_de_rmw(display, DPST_CTL(pipe),
> > + DPST_CTL_BIN_REG_FUNC_SEL |
> > DPST_CTL_BIN_REG_MASK,
> > + DPST_CTL_BIN_REG_FUNC_IE |
> > DPST_CTL_BIN_REG_CLEAR); }
> > +
> > +static void write_iet(struct intel_display *display, enum pipe pipe,
> > + u32 *data)
> > +{
> > + int i;
> > +
> > + if (DISPLAY_VER(display) >= 20) {
> > + for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> > + intel_de_rmw(display, DPST_IE_BIN(pipe),
> > + DPST_IE_BIN_DATA_MASK,
> > + DPST_IE_BIN_DATA(data[i]));
> > + drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n",
> > + i, data[i]);
> > + }
> > + } else {
> > + for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> > + intel_de_rmw(display, DPST_BIN(pipe),
> > + DPST_BIN_DATA_MASK, data[i]);
> > + drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n",
> > + i, data[i]);
> > + }
> > + }
> > +}
>
> The above code can be configured as shown below
>
> int i;
> int register_base, data_mask;
>
> if (DISPLAY_VER(display) >= 20) {
> register_base = DPST_IE_BIN(pipe);
> data_mask = DPST_IE_BIN_DATA_MASK;
> } else {
> register_base = DPST_BIN(pipe);
> data_mask = DPST_BIN_DATA_MASK;
> }
>
> for (i = 0; i < HISTOGRAM_IET_LENGTH; i++) {
> intel_de_rmw(display, register_base, data_mask, data[i]);
> drm_dbg_atomic(display->drm, "iet_lut[%d]=%x\n", i, data[i]); }
>
Writing the data[i] to be writing to the reg bit config also varies.
So rewriting this code within the for loop to optimize the code.
Thanks and Regards,
Arun R Murthy
-------------------
