> -----Original Message----- > From: Intel-gfx <[email protected]> On Behalf Of Pankaj > Bharadiya > Sent: Monday, August 3, 2020 10:00 AM > To: [email protected]; [email protected]; > [email protected]; > [email protected]; [email protected]; > [email protected]; Lattannavar, Sameer <[email protected]>; > Joonas Lahtinen <[email protected]>; Vivi, Rodrigo > <[email protected]>; David Airlie <[email protected]>; Souza, Jose > <[email protected]>; Maarten Lankhorst > <[email protected]>; Chris Wilson <[email protected]>; > Navare, Manasi D <[email protected]>; Wambui Karuga > <[email protected]>; De Marchi, Lucas <[email protected]>; > C, Ramalingam <[email protected]> > Subject: [Intel-gfx] [PATCH v5 4/5] drm/i915/display: Add Nearest-neighbor > based > integer scaling support > > Integer scaling (IS) is a nearest-neighbor upscaling technique that simply > scales > up the existing pixels by an integer (i.e., whole number) multiplier.Nearest- > neighbor (NN) interpolation works by filling in the missing color values in > the > upscaled image with that of the coordinate-mapped nearest source pixel value. > > Both IS and NN preserve the clarity of the original image. Integer scaling is > particularly useful for pixel art games that rely on sharp, blocky images to > deliver > their distinctive look. > > Introduce functions to configure the scaler filter coefficients to enable > nearest- > neighbor filtering. > > Bspec: 49247 > > changes since v3: > * None > changes since v2: > * Move APIs from 5/5 into this patch. > * Change filter programming related function names to cnl_*, move > filter select bits related code into inline function (Ville) changes since > v1: > * Rearrange skl_scaler_setup_nearest_neighbor_filter() to iterate the > registers directly instead of the phases and taps (Ville) > > changes since RFC: > * Refine the skl_scaler_setup_nearest_neighbor_filter() logic (Ville) > > Signed-off-by: Shashank Sharma <[email protected]> > Signed-off-by: Ankit Nautiyal <[email protected]> > Signed-off-by: Pankaj Bharadiya <[email protected]> > --- > drivers/gpu/drm/i915/display/intel_display.c | 99 ++++++++++++++++++++ > drivers/gpu/drm/i915/display/intel_display.h | 4 + > 2 files changed, 103 insertions(+) > > diff --git a/drivers/gpu/drm/i915/display/intel_display.c > b/drivers/gpu/drm/i915/display/intel_display.c > index db2a5a1a9b35..388999404e05 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.c > +++ b/drivers/gpu/drm/i915/display/intel_display.c > @@ -6233,6 +6233,105 @@ void skl_scaler_disable(const struct intel_crtc_state > *old_crtc_state) > skl_detach_scaler(crtc, i); > } > > +static int cnl_coef_tap(int i) You can make this inline. > +{ > + return i % 7; > +} > + > +static u16 cnl_nearest_filter_coef(int t) { Same here. Overall, Changes look good to me. Reviewed-by: Uma Shankar <[email protected]> > + return t == 3 ? 0x0800 : 0x3000; > +} > + > +/** > + * Theory behind setting nearest-neighbor integer scaling: > + * > + * 17 phase of 7 taps requires 119 coefficients in 60 dwords per set. > + * The letter represents the filter tap (D is the center tap) and the > +number > + * represents the coefficient set for a phase (0-16). > + * > + * +------------+------------------------+------------------------+ > + * |Index value | Data value coeffient 1 | Data value coeffient 2 | > + * +------------+------------------------+------------------------+ > + * | 00h | B0 | A0 | > + * +------------+------------------------+------------------------+ > + * | 01h | D0 | C0 | > + * +------------+------------------------+------------------------+ > + * | 02h | F0 | E0 | > + * +------------+------------------------+------------------------+ > + * | 03h | A1 | G0 | > + * +------------+------------------------+------------------------+ > + * | 04h | C1 | B1 | > + * +------------+------------------------+------------------------+ > + * | ... | ... | ... | > + * +------------+------------------------+------------------------+ > + * | 38h | B16 | A16 | > + * +------------+------------------------+------------------------+ > + * | 39h | D16 | C16 | > + * +------------+------------------------+------------------------+ > + * | 3Ah | F16 | C16 | > + * +------------+------------------------+------------------------+ > + * | 3Bh | Reserved | G16 | > + * +------------+------------------------+------------------------+ > + * > + * To enable nearest-neighbor scaling: program scaler coefficents > +with > + * the center tap (Dxx) values set to 1 and all other values set to 0 > +as per > + * SCALER_COEFFICIENT_FORMAT > + * > + */ > + > +static void cnl_program_nearest_filter_coefs(struct drm_i915_private > *dev_priv, > + enum pipe pipe, int id, int set) { > + int i; > + > + intel_de_write_fw(dev_priv, CNL_PS_COEF_INDEX_SET(pipe, id, set), > + PS_COEE_INDEX_AUTO_INC); > + > + for (i = 0; i < 17 * 7; i += 2) { > + u32 tmp; > + int t; > + > + t = cnl_coef_tap(i); > + tmp = cnl_nearest_filter_coef(t); > + > + t = cnl_coef_tap(i + 1); > + tmp |= cnl_nearest_filter_coef(t) << 16; > + > + intel_de_write_fw(dev_priv, CNL_PS_COEF_DATA_SET(pipe, id, > set), > + tmp); > + } > + > + intel_de_write_fw(dev_priv, CNL_PS_COEF_INDEX_SET(pipe, id, set), 0); > +} > + > +inline u32 skl_scaler_get_filter_select(enum drm_scaling_filter filter, > +int set) { > + if (filter == DRM_SCALING_FILTER_NEAREST_NEIGHBOR) { > + return (PS_FILTER_PROGRAMMED | > + PS_Y_VERT_FILTER_SELECT(set) | > + PS_Y_HORZ_FILTER_SELECT(set) | > + PS_UV_VERT_FILTER_SELECT(set) | > + PS_UV_HORZ_FILTER_SELECT(set)); > + } > + > + return PS_FILTER_MEDIUM; > +} > + > +void skl_scaler_setup_filter(struct drm_i915_private *dev_priv, enum pipe > pipe, > + int id, int set, enum drm_scaling_filter filter) { > + switch (filter) { > + case DRM_SCALING_FILTER_DEFAULT: > + break; > + case DRM_SCALING_FILTER_NEAREST_NEIGHBOR: > + cnl_program_nearest_filter_coefs(dev_priv, pipe, id, set); > + break; > + default: > + MISSING_CASE(filter); > + } > +} > + > static void skl_pfit_enable(const struct intel_crtc_state *crtc_state) { > struct intel_crtc *crtc = to_intel_crtc(crtc_state->uapi.crtc); > diff --git a/drivers/gpu/drm/i915/display/intel_display.h > b/drivers/gpu/drm/i915/display/intel_display.h > index e890c8fb779b..878bb36d8322 100644 > --- a/drivers/gpu/drm/i915/display/intel_display.h > +++ b/drivers/gpu/drm/i915/display/intel_display.h > @@ -28,6 +28,7 @@ > #include <drm/drm_util.h> > > enum link_m_n_set; > +enum drm_scaling_filter; > struct dpll; > struct drm_connector; > struct drm_device; > @@ -599,6 +600,9 @@ void intel_crtc_arm_fifo_underrun(struct intel_crtc *crtc, > > u16 skl_scaler_calc_phase(int sub, int scale, bool chroma_center); void > skl_scaler_disable(const struct intel_crtc_state *old_crtc_state); > +u32 skl_scaler_get_filter_select(enum drm_scaling_filter filter, int > +set); void skl_scaler_setup_filter(struct drm_i915_private *dev_priv, enum > pipe > pipe, > + int id, int set, enum drm_scaling_filter filter); > void ilk_pfit_disable(const struct intel_crtc_state *old_crtc_state); > u32 glk_plane_color_ctl(const struct intel_crtc_state *crtc_state, > const struct intel_plane_state *plane_state); > -- > 2.23.0 > > _______________________________________________ > Intel-gfx mailing list > [email protected] > https://lists.freedesktop.org/mailman/listinfo/intel-gfx _______________________________________________ dri-devel mailing list [email protected] https://lists.freedesktop.org/mailman/listinfo/dri-devel
