On 10/19/2020 4:31 AM, Shankar, Uma wrote:
-----Original Message-----
From: Nautiyal, Ankit K <ankit.k.nautiyal@xxxxxxxxx>
Sent: Thursday, October 15, 2020 4:23 PM
To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; Shankar, Uma <uma.shankar@xxxxxxxxx>;
Kulkarni, Vandita <vandita.kulkarni@xxxxxxxxx>; ville.syrjala@xxxxxxxxxxxxxxx;
Sharma, Swati2 <swati2.sharma@xxxxxxxxx>
Subject: [RFC 09/13] drm/edid: Parse DSC1.2 cap fields from HFVSDB block
Move this also to beginning of series along with all DRM helpers.
Agreed will move this with other DRM helpers.
This patch parses HFVSDB fields for DSC1.2 capabilities of an
HDMI2.1 sink. These fields are required by a source to understand the DSC
capability of the sink, to set appropriate PPS parameters, before transmitting
compressed data stream.
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 19 +++++++++++++++++++
include/drm/drm_connector.h | 32 ++++++++++++++++++++++++++++++++
2 files changed, 51 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index
8afb136e73f5..feee19657a7a 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -4889,10 +4889,29 @@ static void
drm_parse_hdmi_21_additional_fields(struct drm_connector *connector, {
struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
u8 max_frl_rate;
+u8 dsc_max_frl_rate;
max_frl_rate = db[7] & DRM_EDID_MAX_FRL_RATE_MASK;
drm_get_max_frl_rate(max_frl_rate, &hdmi->max_lanes,
&hdmi->max_frl_rate_per_lane);
+
+hdmi->dsc_1p2 = db[11] & DRM_EDID_DSC_1P2;
We should right shift them as well to get right values.
You are right, For MAX_FRL_RATE and DSC_MAX_FRL_RATE_MASK given below,
we need to rshift by 4 for getting correct values.
I had missed that in this patch. Will take care in the next version.
But for others there are only 1 bit, we are just storing these as bool,
if the appropriate bit is set.
+ hdmi->dsc_native_420 = db[11] & DRM_EDID_DSC_NATIVE_420;
Same here. Also Alignment is off.
Will fix the alignment in next version.
+hdmi->dsc_all_bpp = db[11] & DRM_EDID_DSC_ALL_BPP;
+
+if (db[11] & DRM_EDID_DSC_16BPC)
+hdmi->dsc_bpc_supported = 16;
+else if (db[11] & DRM_EDID_DSC_12BPC)
+hdmi->dsc_bpc_supported = 12;
+else if (db[11] & DRM_EDID_DSC_10BPC)
+hdmi->dsc_bpc_supported = 10;
+else
+hdmi->dsc_bpc_supported = 0;
+
+dsc_max_frl_rate = db[12] & DRM_EDID_DSC_MAX_FRL_RATE;
This will not give correct value. Fix it.
As mentioned above, will fix this in next version.
+drm_get_max_frl_rate(dsc_max_frl_rate, &hdmi->dsc_max_lanes,
+ &hdmi->dsc_max_frl_rate_per_lane);
+hdmi->dsc_total_chunk_kbytes = db[13] &
+DRM_EDID_DSC_TOTAL_CHUNK_KBYTES;
}
static void drm_parse_ycbcr420_deep_color_info(struct drm_connector
*connector, diff --git a/include/drm/drm_connector.h
b/include/drm/drm_connector.h index f351bf10c076..7100012f9c0f 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -213,6 +213,38 @@ struct drm_hdmi_info {
/** @max_lanes: supported by sink */
u8 max_lanes;
+
+/** @dsc_1p2: flag for dsc1.2 support by sink */
+bool dsc_1p2;
Add a struct for all these HDMI dsc params.
Makes sense, will add a new struct for HDMI dsc parameters read for DSC
supported by a given HDMI sink.
Thanks & Regards,
Ankit
+
+/** @dsc_native_420: Does sink support DSC with 4:2:0 compression */
+bool dsc_native_420;
+
+/**
+ * @dsc_all_bpp: Does sink support all bpp with 4:4:4: or 4:2:2
+ * compressed formats
+ */
+bool dsc_all_bpp;
+
+/**
+ * @dsc_bpc_supported: compressed bpc supported by sink : 10, 12 or 16
bpc
+ */
+u8 dsc_bpc_supported;
+
+/** @dsc_max_slices: maximum number of Horizontal slices supported
by */
+u8 dsc_max_slices;
+
+/** @dsc_clk_per_slice : max pixel clock in MHz supported per slice */
+u8 dsc_clk_per_slice;
+
+/** @dsc_max_lanes : dsc max lanes supported for Fixed rate Link
training */
+u8 dsc_max_lanes;
+
+/** @dsc_max_frl_rate_per_lane : maximum frl rate with DSC per lane */
+u8 dsc_max_frl_rate_per_lane;
+
+/** @dsc_total_chunk_kbytes: max size of chunks in KBs supported per
line*/
+u8 dsc_total_chunk_kbytes;
};
/**
--
2.17.1
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