[Intel-gfx] [PATCH v6 04/28] drm/dp: DRM DP helper/macros to get DP sink DSC parameters
Daniel Vetter
daniel at ffwll.ch
Wed Jan 30 11:06:45 UTC 2019
On Wed, Dec 19, 2018 at 7:54 PM Daniel Vetter <daniel at ffwll.ch> wrote:
>
> On Wed, Oct 24, 2018 at 03:28:16PM -0700, Manasi Navare wrote:
> > This patch adds inline functions and helpers for obtaining
> > DP sink's supported DSC parameters like DSC sink support,
> > eDP compressed BPP supported, maximum slice count supported
> > by the sink devices, DSC line buffer bit depth supported on DP sink,
> > DSC sink maximum color depth by parsing corresponding DPCD registers.
> >
> > v4:
> > * Add helper to give line buf bit depth (Manasi)
> > * Correct the bit masking in color depth helper (manasi)
> > v3:
> > * Use SLICE_CAP_2 for DP (Anusha)
> > v2:
> > * Add DSC sink support macro (Jani N)
> >
> > Cc: Gaurav K Singh <gaurav.k.singh at intel.com>
> > Cc: dri-devel at lists.freedesktop.org
> > Cc: Jani Nikula <jani.nikula at linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> > Cc: Anusha Srivatsa <anusha.srivatsa at intel.com>
> > Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> > Reviewed-by: Anusha Srivatsa <anusha.srivatsa at intel.com>
> > Reviewed-by: Gaurav K Singh <gaurav.k.singh at intel.com>
> > ---
> > drivers/gpu/drm/drm_dp_helper.c | 90 +++++++++++++++++++++++++++++++++
> > include/drm/drm_dp_helper.h | 30 +++++++++++
> > 2 files changed, 120 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> > index 37c01b6076ec..6d483487f2b4 100644
> > --- a/drivers/gpu/drm/drm_dp_helper.c
> > +++ b/drivers/gpu/drm/drm_dp_helper.c
> > @@ -1352,3 +1352,93 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
> > return 0;
> > }
> > EXPORT_SYMBOL(drm_dp_read_desc);
> > +
> > +/**
> > + * DRM DP Helpers for DSC
> > + */
>
> This isn't really kerneldoc. Can you pls fix it, including all the other
> new exported functions?
Ping. Still not fixed, and it's well over one month now. Would be nice
to get this sorted. I'd type the docs myself, but I don't really have
an idea about DSC.
Thanks, Daniel
>
> Thanks, Daniel
>
> > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > + bool is_edp)
> > +{
> > + u8 slice_cap1 = dsc_dpcd[DP_DSC_SLICE_CAP_1 - DP_DSC_SUPPORT];
> > +
> > + if (is_edp) {
> > + /* For eDP, register DSC_SLICE_CAPABILITIES_1 gives slice count */
> > + if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > + return 4;
> > + if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > + return 2;
> > + if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > + return 1;
> > + } else {
> > + /* For DP, use values from DSC_SLICE_CAP_1 and DSC_SLICE_CAP2 */
> > + u8 slice_cap2 = dsc_dpcd[DP_DSC_SLICE_CAP_2 - DP_DSC_SUPPORT];
> > +
> > + if (slice_cap2 & DP_DSC_24_PER_DP_DSC_SINK)
> > + return 24;
> > + if (slice_cap2 & DP_DSC_20_PER_DP_DSC_SINK)
> > + return 20;
> > + if (slice_cap2 & DP_DSC_16_PER_DP_DSC_SINK)
> > + return 16;
> > + if (slice_cap1 & DP_DSC_12_PER_DP_DSC_SINK)
> > + return 12;
> > + if (slice_cap1 & DP_DSC_10_PER_DP_DSC_SINK)
> > + return 10;
> > + if (slice_cap1 & DP_DSC_8_PER_DP_DSC_SINK)
> > + return 8;
> > + if (slice_cap1 & DP_DSC_6_PER_DP_DSC_SINK)
> > + return 6;
> > + if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
> > + return 4;
> > + if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
> > + return 2;
> > + if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
> > + return 1;
> > + }
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_slice_count);
> > +
> > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > + u8 line_buf_depth = dsc_dpcd[DP_DSC_LINE_BUF_BIT_DEPTH - DP_DSC_SUPPORT];
> > +
> > + switch (line_buf_depth & DP_DSC_LINE_BUF_BIT_DEPTH_MASK) {
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_9:
> > + return 9;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_10:
> > + return 10;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_11:
> > + return 11;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_12:
> > + return 12;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_13:
> > + return 13;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_14:
> > + return 14;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_15:
> > + return 15;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_16:
> > + return 16;
> > + case DP_DSC_LINE_BUF_BIT_DEPTH_8:
> > + return 8;
> > + }
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_line_buf_depth);
> > +
> > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > + u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT];
> > +
> > + if (color_depth & DP_DSC_12_BPC)
> > + return 12;
> > + if (color_depth & DP_DSC_10_BPC)
> > + return 10;
> > + if (color_depth & DP_DSC_8_BPC)
> > + return 8;
> > +
> > + return 0;
> > +}
> > +EXPORT_SYMBOL(drm_dp_dsc_sink_max_color_depth);
> > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > index dd33d59739f8..7f7f5b965466 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1067,6 +1067,36 @@ drm_dp_is_branch(const u8 dpcd[DP_RECEIVER_CAP_SIZE])
> > return dpcd[DP_DOWNSTREAMPORT_PRESENT] & DP_DWN_STRM_PORT_PRESENT;
> > }
> >
> > +/* DP/eDP DSC support */
> > +u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
> > + bool is_edp);
> > +u8 drm_dp_dsc_sink_line_buf_depth(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE]);
> > +u8 drm_dp_dsc_sink_max_color_depth(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SIZE]);
> > +
> > +static inline bool
> > +drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > + return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
> > + DP_DSC_DECOMPRESSION_IS_SUPPORTED;
> > +}
> > +
> > +static inline u16
> > +drm_edp_dsc_sink_output_bpp(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > + return dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_LOW - DP_DSC_SUPPORT] |
> > + (dsc_dpcd[DP_DSC_MAX_BITS_PER_PIXEL_HI - DP_DSC_SUPPORT] &
> > + DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK <<
> > + DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT);
> > +}
> > +
> > +static inline u32
> > +drm_dp_dsc_sink_max_slice_width(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
> > +{
> > + /* Max Slicewidth = Number of Pixels * 320 */
> > + return dsc_dpcd[DP_DSC_MAX_SLICE_WIDTH - DP_DSC_SUPPORT] *
> > + DP_DSC_SLICE_WIDTH_MULTIPLIER;
> > +}
> > +
> > /*
> > * DisplayPort AUX channel
> > */
> > --
> > 2.18.0
> >
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx at lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
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