[PATCH v2] drm: Add DPCD definitions for DP 1.4 DSC feature
Jani Nikula
jani.nikula at linux.intel.com
Wed Feb 22 08:23:18 UTC 2017
[Your MUA messed up the quoting, FTFY below.]
On Wed, 22 Feb 2017, "Navare, Manasi D" <manasi.d.navare at intel.com> wrote:
> > On Fri, 17 Feb 2017, Manasi Navare <manasi.d.navare at intel.com> wrote:
> >> Display stream compression is supported on DP 1.4 DP devices. This
> >> patch adds the corersponding DPCD register definitions for DSC.
> >>
> >> v2:
> >> * Rebased on drm-tip
> >>
> >> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> >> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> >> Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
> >> Cc: dri-devel at lists.freedesktop.org
> >
> > Tedious work to cross check this stuff against the spec... found one
> > real issue; while at it please fix a few nitpicks that I would
> > otherwise have ignored.
> >
> > BR,
> > Jani.
> >
> >
> >> ---
> >> include/drm/drm_dp_helper.h | 102
> >> ++++++++++++++++++++++++++++++++++++++++++++
> >> 1 file changed, 102 insertions(+)
> >>
> >> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> >> index ba89295..4c1fc26 100644
> >> --- a/include/drm/drm_dp_helper.h
> >> +++ b/include/drm/drm_dp_helper.h
> >> @@ -179,6 +179,108 @@
> >>
> >> #define DP_GUID 0x030 /* 1.2 */
> >>
> >> +#define DP_DSC_SUPPORT 0x060 /* DP 1.4 */
> >> +# define DP_DSC_DECOMPRESSION_IS_SUPPORTED (1 << 0)
> >> +
> >> +#define DP_DSC_REV 0x061
> >> +# define DP_DSC_MAJOR_MASK (15 << 0)
> >> +# define DP_DSC_MINOR_MASK (15 << 4)
> >> +# define DP_DSC_MINOR_SHIFT 4
> >
> > Nitpick: Hex is preferred for masks. Same for all masks
> > below. MAJOR_SHIFT for completeness.
> >
> So should I add the MAJOR_SHIFT as well even though it will just 0?
Yes, 0 is not special here. Having it is also self-documenting, so you
don't have to look up the DP spec to check.
> >
> >
> >> +
> >> +#define DP_DSC_RC_BUF_BLK_SIZE 0x062
> >> +# define DP_DSC_RC_BUF_BLK_SIZE_1 0x0
> >> +# define DP_DSC_RC_BUF_BLK_SIZE_4 0x1
> >> +# define DP_DSC_RC_BUF_BLK_SIZE_16 0x2
> >> +# define DP_DSC_RC_BUF_BLK_SIZE_64 0x3
> >> +
> >> +#define DP_DSC_RC_BUF_SIZE 0x063
> >> +
> >> +#define DP_DSC_SLICE_CAP_1 0x064
> >> +# define DP_DSC_1_PER_DP_DSC_SINK (1 << 0)
> >> +# define DP_DSC_2_PER_DP_DSC_SINK (1 << 1)
> >> +# define DP_DSC_4_PER_DP_DSC_SINK (1 << 3)
> >> +# define DP_DSC_6_PER_DP_DSC_SINK (1 << 4)
> >> +# define DP_DSC_8_PER_DP_DSC_SINK (1 << 5)
> >> +# define DP_DSC_10_PER_DP_DSC_SINK (1 << 6)
> >> +# define DP_DSC_12_PER_DP_DSC_SINK (1 << 7)
> >> +
> >> +#define DP_DSC_LINE_BUF_BIT_DEPTH 0x065
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_MASK (15 << 0)
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_9 0x0
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_10 0x1
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_11 0x2
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_12 0x3
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_13 0x4
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_14 0x5
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_15 0x6
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_16 0x7
> >> +# define DP_DSC_LINE_BUF_BIT_DEPTH_8 0x8
> >> +
> >> +#define DP_DSC_BLK_PREDICTION_SUPPORT 0x066
> >> +# define DP_DSC_BLK_PREDICTION_IS_SUPPORTED (1 << 0)
> >> +
> >> +#define DP_DSC_MAX_BITS_PER_PIXEL_LOW 0x067 /* eDP 1.4 */
> >> +
> >> +#define DP_DSC_MAX_BITS_PER_PIXEL_HI 0x068 /* eDP 1.4 */
> >> +
> >> +#define DP_DSC_DEC_COLOR_FORMAT_CAP 0x069
> >> +# define DP_DSC_RGB (1 << 0)
> >> +# define DP_DSC_YCbCr444 (1 << 1)
> >> +# define DP_DSC_YCbCr422_Simple (1 << 2)
> >> +# define DP_DSC_YCbCr422_Native (1 << 3)
> >> +# define DP_DSC_YCbCr420_Native (1 << 4)
> >> +
> >> +#define DP_DSC_DEC_COLOR_DEPTH_CAP 0x06A
> >> +# define DP_DSC_8_BPC (1 << 1)
> >> +# define DP_DSC_10_BPC (1 << 2)
> >> +# define DP_DSC_12_BPC (1 >> 3)
> >
> > Oops, shifting to wrong direction!
>
> Oops, yes that is my mistake, I will fix the shift direction.
>
> >> +
> >> +#define DP_DSC_PEAK_THROUGHPUT 0x06B
> >> +# define DP_DSC_THROUGHPUT_MODE_0_340 0x1
> >> +# define DP_DSC_THROUGHPUT_MODE_0_400 0x2
> >> +# define DP_DSC_THROUGHPUT_MODE_0_450 0x3
> >> +# define DP_DSC_THROUGHPUT_MODE_0_500 0x4
> >> +# define DP_DSC_THROUGHPUT_MODE_0_550 0x5
> >> +# define DP_DSC_THROUGHPUT_MODE_0_600 0x6
> >> +# define DP_DSC_THROUGHPUT_MODE_0_650 0x7
> >> +# define DP_DSC_THROUGHPUT_MODE_0_700 0x8
> >> +# define DP_DSC_THROUGHPUT_MODE_0_750 0x9
> >> +# define DP_DSC_THROUGHPUT_MODE_0_800 0xA
> >> +# define DP_DSC_THROUGHPUT_MODE_0_850 0xB
> >> +# define DP_DSC_THROUGHPUT_MODE_0_900 0xC
> >> +# define DP_DSC_THROUGHPUT_MODE_0_950 0xD
> >> +# define DP_DSC_THROUGHPUT_MODE_0_1000 0xE
> >
> > Nitpick: MODE_0_MASK and MODE_0_SHIFT for completeness. Seems
> > inconsistent to use hex for MODE_0 values and dec for MODE_1 values.
>
> For Mode 0, it would be all these values shifted by 0, should I add
> the shifts by 0 for consistency with MODE_1?
Nah, that I think is not needed, but I could go both ways. (However for
defining bits we usually use BIT(0) or (1 << 0) rather than plain 1.)
> And yes I will add MODE_0 MASK and SHIFT.
Thanks.
BR,
Jani.
>
> Regards
> Manasi
> >
> >> +# define DP_DSC_THROUGHPUT_MODE_1_MASK (15 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_SHIFT 4
> >> +# define DP_DSC_THROUGHPUT_MODE_1_340 (1 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_400 (2 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_450 (3 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_500 (4 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_550 (5 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_600 (6 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_650 (7 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_700 (8 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_750 (9 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_800 (10 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_850 (11 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_900 (12 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_950 (13 << 4)
> >> +# define DP_DSC_THROUGHPUT_MODE_1_1000 (14 << 4)
> >> +
> >> +#define DP_DSC_MAX_SLICE_WIDTH 0x06C
> >> +
> >> +#define DP_DSC_SLICE_CAP_2 0x06D
> >> +# define DP_DSC_16_PER_DP_DSC_SINK (1 << 0)
> >> +# define DP_DSC_20_PER_DP_DSC_SINK (1 << 1)
> >> +# define DP_DSC_24_PER_DP_DSC_SINK (1 << 2)
> >> +
> >> +#define DP_DSC_BITS_PER_PIXEL_INC 0x06F
> >> +# define DP_DSC_BITS_PER_PIXEL_1_16 0x0
> >> +# define DP_DSC_BITS_PER_PIXEL_1_8 0x1
> >> +# define DP_DSC_BITS_PER_PIXEL_1_4 0x2
> >> +# define DP_DSC_BITS_PER_PIXEL_1_2 0x3
> >> +# define DP_DSC_BITS_PER_PIXEL_1 0x4
> >> +
> >> #define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */
> >> # define DP_PSR_IS_SUPPORTED 1
> >> # define DP_PSR2_IS_SUPPORTED 2 /* eDP 1.4 */
> >
> > --
> > Jani Nikula, Intel Open Source Technology Center
>
> --
> Jani Nikula, Intel Open Source Technology Center
>
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