Commit 1319f217 authored by Michael Walle's avatar Michael Walle Committed by Neil Armstrong
Browse files

drm/panel-simple: add Evervision VGG644804 panel entry 



Timings taken from the datasheet, although sometimes there are just
typical values and it's not clear if they are no min and max values or
if you must use the typical value exactly. To make things worse, there
is no back porch but only a combined sync and back porch length.

Unfortunately, there is not public datasheet. Therefore, here are the
relevant timings:
                 | min |  typ   | max |
-----------------+-----+--------+-----+
CLK frequency    |  -  | 25.175 |  -  |
HS period        |  -  |   800  |  -  |
HS pulse width   |  5  |    30  |  -  |
HS-DEN time      | 112 |   144  | 175 |
DEN pulse width  |  -  |   640  |  -  |
VS pulse width   |  1  |     3  |  5  |
VS-DEN time      |  -  |    35  |  -  |
VS period        |  -  |   525  |  -  |

Signed-off-by: default avatarMichael Walle <mwalle@kernel.org>
Reviewed-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://lore.kernel.org/r/20231123102404.2022201-2-mwalle@kernel.org


Signed-off-by: default avatarNeil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20231123102404.2022201-2-mwalle@kernel.org
parent 2a5244a0

drivers/gpu/drm/panel/panel-simple.c

+30 −0
Original line number Diff line number Diff line
@@ -2002,6 +2002,33 @@ static const struct panel_desc eink_vb3300_kca = { 
	.connector_type = DRM_MODE_CONNECTOR_DPI,

};



static const struct display_timing evervision_vgg644804_timing = {

	.pixelclock = { 25175000, 25175000, 25175000 },

	.hactive = { 640, 640, 640 },

	.hfront_porch = { 16, 16, 16 },

	.hback_porch = { 82, 114, 170 },

	.hsync_len = { 5, 30, 30 },

	.vactive = { 480, 480, 480 },

	.vfront_porch = { 10, 10, 10 },

	.vback_porch = { 30, 32, 34 },

	.vsync_len = { 1, 3, 5 },

	.flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |

		 DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_POSEDGE |

		 DISPLAY_FLAGS_SYNC_POSEDGE,

};



static const struct panel_desc evervision_vgg644804 = {

	.timings = &evervision_vgg644804_timing,

	.num_timings = 1,

	.bpc = 8,

	.size = {

		.width = 115,

		.height = 86,

	},

	.bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,

	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,

};



static const struct display_timing evervision_vgg804821_timing = {

	.pixelclock = { 27600000, 33300000, 50000000 },

	.hactive = { 800, 800, 800 },
@@ -4366,6 +4393,9 @@ static const struct of_device_id platform_of_match[] = { 
	}, {

		.compatible = "eink,vb3300-kca",

		.data = &eink_vb3300_kca,

	}, {

		.compatible = "evervision,vgg644804",

		.data = &evervision_vgg644804,

	}, {

		.compatible = "evervision,vgg804821",

		.data = &evervision_vgg804821,