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drm: exynos: dsi: Add atomic_get_input_bus_fmts

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Finding the right input bus format throughout the pipeline is hard
so add atomic_get_input_bus_fmts callback and initialize with the
proper input format from list of supported output formats.

This format can be used in pipeline for negotiating bus format between
the DSI-end of this bridge and the other component closer to pipeline
components.

List of Pixel formats are taken from,
AN13573 i.MX 8/RT MIPI DSI/CSI-2, Rev. 0, 21 March 2022
3.7.4 Pixel formats
Table 14. DSI pixel packing formats

Reviewed-by: Marek Vasut <marex@denx.de>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Jagan Teki
2023-03-08 22:09:46 +05:30
committed by Inki Dae
parent 184f37e578
commit 44d214a711
1 changed files with 62 additions and 0 deletions
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62
drivers/gpu/drm/exynos/exynos_drm_dsi.c
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@@ -12,6 +12,7 @@
#include <linux/component.h>
#include <linux/gpio/consumer.h>
#include <linux/irq.h>
#include <linux/media-bus-format.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/phy/phy.h>
@@ -1466,6 +1467,66 @@ static void exynos_dsi_atomic_post_disable(struct drm_bridge *bridge,
pm_runtime_put_sync(dsi->dev);
}
/*
* This pixel output formats list referenced from,
* AN13573 i.MX 8/RT MIPI DSI/CSI-2, Rev. 0, 21 March 2022
* 3.7.4 Pixel formats
* Table 14. DSI pixel packing formats
*/
static const u32 exynos_dsi_pixel_output_fmts[] = {
MEDIA_BUS_FMT_YUYV10_1X20,
MEDIA_BUS_FMT_YUYV12_1X24,
MEDIA_BUS_FMT_UYVY8_1X16,
MEDIA_BUS_FMT_RGB101010_1X30,
MEDIA_BUS_FMT_RGB121212_1X36,
MEDIA_BUS_FMT_RGB565_1X16,
MEDIA_BUS_FMT_RGB666_1X18,
MEDIA_BUS_FMT_RGB888_1X24,
};
static bool exynos_dsi_pixel_output_fmt_supported(u32 fmt)
{
int i;
if (fmt == MEDIA_BUS_FMT_FIXED)
return false;
for (i = 0; i < ARRAY_SIZE(exynos_dsi_pixel_output_fmts); i++) {
if (exynos_dsi_pixel_output_fmts[i] == fmt)
return true;
}
return false;
}
static u32 *
exynos_dsi_atomic_get_input_bus_fmts(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
struct drm_connector_state *conn_state,
u32 output_fmt,
unsigned int *num_input_fmts)
{
u32 *input_fmts;
input_fmts = kmalloc(sizeof(*input_fmts), GFP_KERNEL);
if (!input_fmts)
return NULL;
if (!exynos_dsi_pixel_output_fmt_supported(output_fmt))
/*
* Some bridge/display drivers are still not able to pass the
* correct format, so handle those pipelines by falling back
* to the default format till the supported formats finalized.
*/
output_fmt = MEDIA_BUS_FMT_RGB888_1X24;
input_fmts[0] = output_fmt;
*num_input_fmts = 1;
return input_fmts;
}
static int exynos_dsi_atomic_check(struct drm_bridge *bridge,
struct drm_bridge_state *bridge_state,
struct drm_crtc_state *crtc_state,
@@ -1514,6 +1575,7 @@ static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
.atomic_reset = drm_atomic_helper_bridge_reset,
.atomic_get_input_bus_fmts = exynos_dsi_atomic_get_input_bus_fmts,
.atomic_check = exynos_dsi_atomic_check,
.atomic_pre_enable = exynos_dsi_atomic_pre_enable,
.atomic_enable = exynos_dsi_atomic_enable,