Regards
Shashank
On 2/8/2017 5:06 PM, Jose Abreu wrote:
Hi,
On 07-02-2017 16:36, Thierry Reding wrote:
On Tue, Feb 07, 2017 at 09:43:15PM +0530, Sharma, Shashank wrote:
Regards
Shashank
On 2/7/2017 4:31 PM, Jose Abreu wrote:
Hi Shashank,
On 06-02-2017 13:59, Shashank Sharma wrote:
This patch does following:
- Adds a new structure (drm_hdmi_info) in drm_display_info.
This structure will be used to save and indicate if sink
supports advanced HDMI 2.0 features
- Adds another structure drm_scdc within drm_hdmi_info, to
reflect scdc support and capabilities in connected HDMI 2.0 sink.
- Checks the HF-VSDB block for presence of SCDC, and marks it
in scdc structure
- If SCDC is present, checks if sink is capable of generating
SCDC read request, and marks it in scdc structure.
V2: Addressed review comments
Thierry:
- Fix typos in commit message and make abbreviation consistent
across the commit message.
- Change structure object name from hdmi_info -> hdmi
- Fix typos and abbreviations in description of structure drm_hdmi_info
end the description with a full stop.
- Create a structure drm_scdc, and keep all information related to SCDC
register set (supported, read request supported) etc in it.
Ville:
- Change rr -> read_request
- Call drm_detect_scrambling function drm_parse_hf_vsdb so that all
of HF-VSDB parsing can be kept in same function, in incremental
patches.
Reviewed-by: Thierry Reding <treding@xxxxxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxxxx>
---
drivers/gpu/drm/drm_edid.c | 14 ++++++++++++++
include/drm/drm_connector.h | 33 +++++++++++++++++++++++++++++++++
2 files changed, 47 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 96d3e47..a487b80 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -3802,6 +3802,18 @@ enum hdmi_quantization_range
}
EXPORT_SYMBOL(drm_default_rgb_quant_range);
+static void drm_parse_hdmi_forum_vsdb(struct drm_connector *connector,
+ const u8 *hf_vsdb)
+{
+ struct drm_hdmi_info *hdmi = &connector->display_info.hdmi;
+
+ if (hf_vsdb[6] & 0x80) {
BIT(7) ?
Yes, SCDC_present bit is bit 7, byte 6 in HF-VSDB. Am I missing something ?
+ hdmi->scdc.supported = true;
+ if (hf_vsdb[6] & 0x40)
BIT(6) ?
Yes, RR_Capable bit is bit 6, byte 6 in HF-VSDB.
I think what Jose was trying to say is that you should be using BIT(7)
instead of 0x80 and BIT(6) instead of 0x40. That said, I think either is
fine, but perhaps another idea would be to define macros for these. I
know that most (all?) of the EDID parsing code uses literals, so this is
consistent with existing code. Also usually code will be like:
if (hf_vsdb[X] & 0xYZ)
foo_supported = true;
So the meaning of the bit is easy to read from the context. I think
literals are fine in this case.
Thierry
Thats exactly what I meant :) I think with BIT(x) the code is
easier to read (my hex skills are not very good :)). Anyway, if
the remaining code uses literals then maybe its better to keep
consistency.
Thanks, then we will keep this code, as it is.
- Shashank
Best regards,
Jose Miguel Abreu
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