lkml.org 
[lkml]   [2022]   [Jan]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] drm/edid: Support type 7 timings
Date
Per VESA DisplayID Standard v2.0: Type VII Timing – Detailed Timing Data

Definitions were already provided as type I, but not used

Signed-off-by: Yaroslav Bolyukin <iam@lach.pw>
---
drivers/gpu/drm/drm_edid.c | 26 +++++++++++++++++---------
include/drm/drm_displayid.h | 6 +++---
2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index 12893e7be..5fcefd9b5 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -5404,13 +5404,17 @@ u32 drm_add_display_info(struct drm_connector *connector, const struct edid *edi
return quirks;
}

-static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *dev,
- struct displayid_detailed_timings_1 *timings)
+static struct drm_display_mode *drm_mode_displayid_detailed_1_7(struct drm_device *dev,
+ struct displayid_detailed_timings_1_7 *timings,
+ bool type_7)
{
struct drm_display_mode *mode;
unsigned pixel_clock = (timings->pixel_clock[0] |
(timings->pixel_clock[1] << 8) |
(timings->pixel_clock[2] << 16)) + 1;
+ // type 7 allows higher precision pixel clock
+ if (!type_7)
+ pixel_clock *= 10;
unsigned hactive = (timings->hactive[0] | timings->hactive[1] << 8) + 1;
unsigned hblank = (timings->hblank[0] | timings->hblank[1] << 8) + 1;
unsigned hsync = (timings->hsync[0] | (timings->hsync[1] & 0x7f) << 8) + 1;
@@ -5426,7 +5430,7 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d
if (!mode)
return NULL;

- mode->clock = pixel_clock * 10;
+ mode->clock = pixel_clock;
mode->hdisplay = hactive;
mode->hsync_start = mode->hdisplay + hsync;
mode->hsync_end = mode->hsync_start + hsync_width;
@@ -5449,10 +5453,12 @@ static struct drm_display_mode *drm_mode_displayid_detailed(struct drm_device *d
return mode;
}

-static int add_displayid_detailed_1_modes(struct drm_connector *connector,
- const struct displayid_block *block)
+static int add_displayid_detailed_1_7_modes(struct drm_connector *connector,
+ const struct displayid_block *block,
+ bool type_7)
{
- struct displayid_detailed_timing_block *det = (struct displayid_detailed_timing_block *)block;
+ struct displayid_detailed_timing_1_7_block *det =
+ (struct displayid_detailed_timing_1_7_block *)block;
int i;
int num_timings;
struct drm_display_mode *newmode;
@@ -5463,9 +5469,9 @@ static int add_displayid_detailed_1_modes(struct drm_connector *connector,

num_timings = block->num_bytes / 20;
for (i = 0; i < num_timings; i++) {
- struct displayid_detailed_timings_1 *timings = &det->timings[i];
+ struct displayid_detailed_timings_1_7 *timings = &det->timings[i];

- newmode = drm_mode_displayid_detailed(connector->dev, timings);
+ newmode = drm_mode_displayid_detailed_1_7(connector->dev, timings, type_7);
if (!newmode)
continue;

@@ -5485,7 +5491,9 @@ static int add_displayid_detailed_modes(struct drm_connector *connector,
displayid_iter_edid_begin(edid, &iter);
displayid_iter_for_each(block, &iter) {
if (block->tag == DATA_BLOCK_TYPE_1_DETAILED_TIMING)
- num_modes += add_displayid_detailed_1_modes(connector, block);
+ num_modes += add_displayid_detailed_1_7_modes(connector, block, false);
+ else if (block->tag == DATA_BLOCK_2_TYPE_7_DETAILED_TIMING)
+ num_modes += add_displayid_detailed_1_7_modes(connector, block, true);
}
displayid_iter_end(&iter);

diff --git a/include/drm/drm_displayid.h b/include/drm/drm_displayid.h
index 7ffbd9f7b..268ff5e1f 100644
--- a/include/drm/drm_displayid.h
+++ b/include/drm/drm_displayid.h
@@ -111,7 +111,7 @@ struct displayid_tiled_block {
u8 topology_id[8];
} __packed;

-struct displayid_detailed_timings_1 {
+struct displayid_detailed_timings_1_7 {
u8 pixel_clock[3];
u8 flags;
u8 hactive[2];
@@ -124,9 +124,9 @@ struct displayid_detailed_timings_1 {
u8 vsw[2];
} __packed;

-struct displayid_detailed_timing_block {
+struct displayid_detailed_timing_1_7_block {
struct displayid_block base;
- struct displayid_detailed_timings_1 timings[];
+ struct displayid_detailed_timings_1_7 timings[];
};

#define DISPLAYID_VESA_MSO_OVERLAP GENMASK(3, 0)
base-commit: 99613159ad749543621da8238acf1a122880144e
--
2.34.1

\
 
 \ /
  Last update: 2022-01-18 23:07    [W:0.106 / U:0.572 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site