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[PATCH v3 1/3] edid: move timing generation into a separate function
From: |
Konstantin Nazarov |
Subject: |
[PATCH v3 1/3] edid: move timing generation into a separate function |
Date: |
Mon, 15 Mar 2021 14:46:37 +0300 |
The timing generation is currently performed inside the function that
fills in the DTD. The DisplayID generation needs it as well, so moving
it out to a separate function.
Based-on: <20210303152948.59943-2-akihiko.odaki@gmail.com>
Signed-off-by: Konstantin Nazarov <mail@knazarov.com>
---
hw/display/edid-generate.c | 68 ++++++++++++++++++++++++--------------
1 file changed, 44 insertions(+), 24 deletions(-)
diff --git a/hw/display/edid-generate.c b/hw/display/edid-generate.c
index b0ce583d436..1e1d89b9a78 100644
--- a/hw/display/edid-generate.c
+++ b/hw/display/edid-generate.c
@@ -44,6 +44,35 @@ static const struct edid_mode {
{ .xres = 640, .yres = 480, .byte = 35, .bit = 5 },
};
+typedef struct Timings {
+ uint32_t xfront;
+ uint32_t xsync;
+ uint32_t xblank;
+
+ uint32_t yfront;
+ uint32_t ysync;
+ uint32_t yblank;
+
+ uint64_t clock;
+} Timings;
+
+static void generate_timings(Timings *timings, uint32_t refresh_rate,
+ uint32_t xres, uint32_t yres)
+{
+ /* pull some realistic looking timings out of thin air */
+ timings->xfront = xres * 25 / 100;
+ timings->xsync = xres * 3 / 100;
+ timings->xblank = xres * 35 / 100;
+
+ timings->yfront = yres * 5 / 1000;
+ timings->ysync = yres * 5 / 1000;
+ timings->yblank = yres * 35 / 1000;
+
+ timings->clock = ((uint64_t)refresh_rate *
+ (xres + timings->xblank) *
+ (yres + timings->yblank)) / 10000000;
+}
+
static void edid_ext_dta(uint8_t *dta)
{
dta[0] = 0x02;
@@ -207,38 +236,29 @@ static void edid_desc_timing(uint8_t *desc, uint32_t
refresh_rate,
uint32_t xres, uint32_t yres,
uint32_t xmm, uint32_t ymm)
{
- /* pull some realistic looking timings out of thin air */
- uint32_t xfront = xres * 25 / 100;
- uint32_t xsync = xres * 3 / 100;
- uint32_t xblank = xres * 35 / 100;
-
- uint32_t yfront = yres * 5 / 1000;
- uint32_t ysync = yres * 5 / 1000;
- uint32_t yblank = yres * 35 / 1000;
-
- uint64_t clock = (uint64_t)refresh_rate * (xres + xblank) * (yres +
yblank);
-
- stl_le_p(desc, clock / 10000000);
+ Timings timings;
+ generate_timings(&timings, refresh_rate, xres, yres);
+ stl_le_p(desc, timings.clock);
desc[2] = xres & 0xff;
- desc[3] = xblank & 0xff;
+ desc[3] = timings.xblank & 0xff;
desc[4] = (((xres & 0xf00) >> 4) |
- ((xblank & 0xf00) >> 8));
+ ((timings.xblank & 0xf00) >> 8));
desc[5] = yres & 0xff;
- desc[6] = yblank & 0xff;
+ desc[6] = timings.yblank & 0xff;
desc[7] = (((yres & 0xf00) >> 4) |
- ((yblank & 0xf00) >> 8));
+ ((timings.yblank & 0xf00) >> 8));
- desc[8] = xfront & 0xff;
- desc[9] = xsync & 0xff;
+ desc[8] = timings.xfront & 0xff;
+ desc[9] = timings.xsync & 0xff;
- desc[10] = (((yfront & 0x00f) << 4) |
- ((ysync & 0x00f) << 0));
- desc[11] = (((xfront & 0x300) >> 2) |
- ((xsync & 0x300) >> 4) |
- ((yfront & 0x030) >> 2) |
- ((ysync & 0x030) >> 4));
+ desc[10] = (((timings.yfront & 0x00f) << 4) |
+ ((timings.ysync & 0x00f) << 0));
+ desc[11] = (((timings.xfront & 0x300) >> 2) |
+ ((timings.xsync & 0x300) >> 4) |
+ ((timings.yfront & 0x030) >> 2) |
+ ((timings.ysync & 0x030) >> 4));
desc[12] = xmm & 0xff;
desc[13] = ymm & 0xff;
--
2.24.3 (Apple Git-128)
- [PATCH v3 1/3] edid: move timing generation into a separate function,
Konstantin Nazarov <=