drm/panel-simple: Add 50 Hz mode to the Frida FRD350H54004 panel

By changing the pixel clock and the length of the back porch, it is
possible to obtain a perfect 50 Hz refresh rate.

v2: Rebase on drm-misc-next

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200716125647.10964-2-paul@crapouillou.net

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 8b0bab9..8849353 100644 (file)
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -1753,22 +1753,36 @@ static const struct panel_desc foxlink_fl500wvr00_a0t = {
        .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
-static const struct drm_display_mode frida_frd350h54004_mode = {
-       .clock = 6000,
-       .hdisplay = 320,
-       .hsync_start = 320 + 44,
-       .hsync_end = 320 + 44 + 16,
-       .htotal = 320 + 44 + 16 + 20,
-       .vdisplay = 240,
-       .vsync_start = 240 + 2,
-       .vsync_end = 240 + 2 + 6,
-       .vtotal = 240 + 2 + 6 + 2,
-       .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+static const struct drm_display_mode frida_frd350h54004_modes[] = {
+       { /* 60 Hz */
+               .clock = 6000,
+               .hdisplay = 320,
+               .hsync_start = 320 + 44,
+               .hsync_end = 320 + 44 + 16,
+               .htotal = 320 + 44 + 16 + 20,
+               .vdisplay = 240,
+               .vsync_start = 240 + 2,
+               .vsync_end = 240 + 2 + 6,
+               .vtotal = 240 + 2 + 6 + 2,
+               .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+       },
+       { /* 50 Hz */
+               .clock = 5400,
+               .hdisplay = 320,
+               .hsync_start = 320 + 56,
+               .hsync_end = 320 + 56 + 16,
+               .htotal = 320 + 56 + 16 + 40,
+               .vdisplay = 240,
+               .vsync_start = 240 + 2,
+               .vsync_end = 240 + 2 + 6,
+               .vtotal = 240 + 2 + 6 + 2,
+               .flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+       },
 };
 
 static const struct panel_desc frida_frd350h54004 = {
-       .modes = &frida_frd350h54004_mode,
-       .num_modes = 1,
+       .modes = frida_frd350h54004_modes,
+       .num_modes = ARRAY_SIZE(frida_frd350h54004_modes),
        .bpc = 8,
        .size = {
                .width = 77,