From: Linus Walleij <linus.walleij@linaro.org>
Date: Tue, 20 Feb 2018 08:28:59 +0100
Subject: drm: simple_kms_helper: Add mode_valid() callback support
Git-commit: 40275dc4edb49d7ed543eb847f618dc12e5a024c
Patch-mainline: v4.17-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166
The PL111 needs to filter valid modes based on memory bandwidth.
I guess it is a pretty simple operation, so we can still claim
the DRM KMS helper pipeline is simple after adding this (optional)
vtable callback.
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180220072859.3386-1-linus.walleij@linaro.org
Acked-by: Petr Tesarik <ptesarik@suse.com>
---
drivers/gpu/drm/drm_simple_kms_helper.c | 15 +++++++++++++++
include/drm/drm_simple_kms_helper.h | 14 ++++++++++++++
2 files changed, 29 insertions(+)
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -34,6 +34,20 @@ static const struct drm_encoder_funcs dr
.destroy = drm_encoder_cleanup,
};
+static enum drm_mode_status
+drm_simple_kms_crtc_mode_valid(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode)
+{
+ struct drm_simple_display_pipe *pipe;
+
+ pipe = container_of(crtc, struct drm_simple_display_pipe, crtc);
+ if (!pipe->funcs || !pipe->funcs->mode_valid)
+ /* Anything goes */
+ return MODE_OK;
+
+ return pipe->funcs->mode_valid(crtc, mode);
+}
+
static int drm_simple_kms_crtc_check(struct drm_crtc *crtc,
struct drm_crtc_state *state)
{
@@ -72,6 +86,7 @@ static void drm_simple_kms_crtc_disable(
}
static const struct drm_crtc_helper_funcs drm_simple_kms_crtc_helper_funcs = {
+ .mode_valid = drm_simple_kms_crtc_mode_valid,
.atomic_check = drm_simple_kms_crtc_check,
.atomic_enable = drm_simple_kms_crtc_enable,
.atomic_disable = drm_simple_kms_crtc_disable,
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -22,6 +22,20 @@ struct drm_simple_display_pipe;
*/
struct drm_simple_display_pipe_funcs {
/**
+ * @mode_valid:
+ *
+ * This function is called to filter out valid modes from the
+ * suggestions suggested by the bridge or display. This optional
+ * hook is passed in when initializing the pipeline.
+ *
+ * RETURNS:
+ *
+ * drm_mode_status Enum
+ */
+ enum drm_mode_status (*mode_valid)(struct drm_crtc *crtc,
+ const struct drm_display_mode *mode);
+
+ /**
* @enable:
*
* This function should be used to enable the pipeline.