80 lines
2.5 KiB
Diff
80 lines
2.5 KiB
Diff
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From ead5444f9c3967953b5ff1c974e4f537020d03c9 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Ond=C5=99ej=20Jirman?= <megi@xff.cz>
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Date: Tue, 16 Nov 2021 21:19:42 +0100
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Subject: [PATCH 302/389] drm: panel: hx8394: Fix mode to have refresh rate of
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60 Hz
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VSYNC settings did not match the init sequence values. Fix that first.
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Now we need to generate exact clock frequency from some of the available
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PLLs by a simple division:
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GPLL = 594 MHz
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VPLL = unused, can be set to anything
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CPLL = 800 MHz
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Needed clock is 60 * vtotal * htotal = 60 * 1463 * ~844 = 74086320
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So no we have an optimization task. We need clock frequency that can
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be generated from 594 or 800 MHz by integer division and we can adjust
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the needed frequency a little by adjusting hsync timings.
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594 / 74 = 8.027
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800 / 74 = 10.811
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So GPLL is a better candidate because it will need smaller adjustment
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of HSYNC timings. Exact frequency that can be generated is:
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594 / 8 = 74.25
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Which would require htotal to be 74 250 000 / (60 * vtotal) = 846
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So let's set horizontal timings to 720 40 46 40.
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Signed-off-by: Ondrej Jirman <megi@xff.cz>
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---
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drivers/gpu/drm/panel/panel-himax-hx8394.c | 27 +++++-----------------
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1 file changed, 6 insertions(+), 21 deletions(-)
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diff --git a/drivers/gpu/drm/panel/panel-himax-hx8394.c b/drivers/gpu/drm/panel/panel-himax-hx8394.c
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index 1f23190a3ec0..fc04e50dd242 100644
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--- a/drivers/gpu/drm/panel/panel-himax-hx8394.c
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+++ b/drivers/gpu/drm/panel/panel-himax-hx8394.c
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@@ -95,28 +95,13 @@ static int hsd060bhw4_init_sequence(struct hx8394 *ctx)
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static const struct drm_display_mode hsd060bhw4_mode = {
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.hdisplay = 720,
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.hsync_start = 720 + 40,
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- .hsync_end = 720 + 40 + 40,
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- .htotal = 720 + 40 + 40 + 40,
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+ .hsync_end = 720 + 40 + 46,
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+ .htotal = 720 + 40 + 46 + 40,
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.vdisplay = 1440,
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- .vsync_start = 1440 + 18,
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- .vsync_end = 1440 + 18 + 10,
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- .vtotal = 1440 + 18 + 10 + 17,
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- .clock = 69000,
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- .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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- .width_mm = 68,
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- .height_mm = 136,
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-};
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-
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-static const struct drm_display_mode hsd060bhw4_mode2 = {
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- .hdisplay = 720,
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- .hsync_start = 720 + 50,
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- .hsync_end = 720 + 50 + 10,
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- .htotal = 720 + 50 + 10 + 50,
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- .vdisplay = 1440,
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- .vsync_start = 1440 + 17,
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- .vsync_end = 1440 + 17 + 4,
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- .vtotal = 1440 + 17 + 4 + 10,
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- .clock = 60000,
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+ .vsync_start = 1440 + 9,
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+ .vsync_end = 1440 + 9 + 7,
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+ .vtotal = 1440 + 9 + 7 + 7,
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+ .clock = 74250,
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.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
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.width_mm = 68,
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.height_mm = 136,
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--
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2.35.3
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