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Most bridge drivers create a DRM connector to model the connector at the
output of the bridge. This model is historical and has worked pretty
well so far, but causes several issues:
- It prevents supporting more complex display pipelines where DRM
connector operations are split over multiple components. For instance a
pipeline with a bridge connected to the DDC signals to read EDID data,
and another one connected to the HPD signal to detect connection and
disconnection, will not be possible to support through this model.
- It requires every bridge driver to implement similar connector
handling code, resulting in code duplication.
- It assumes that a bridge will either be wired to a connector or to
another bridge, but doesn't support bridges that can be used in both
positions very well (although there is some ad-hoc support for this in
the analogix_dp bridge driver).
In order to solve these issues, ownership of the connector should be
moved to the display controller driver (where it can be implemented
using helpers provided by the core).
Extend the bridge API to allow disabling connector creation in bridge
drivers as a first step towards the new model. The new flags argument to
the bridge .attach() operation allows instructing the bridge driver to
skip creating a connector. Unconditionally set the new flags argument to
0 for now to keep the existing behaviour, and modify all existing bridge
drivers to return an error when connector creation is not requested as
they don't support this feature yet.
The change is based on the following semantic patch, with manual review
and edits.
@ rule1 @
identifier funcs;
identifier fn;
@@
struct drm_bridge_funcs funcs = {
...,
.attach = fn
};
@ depends on rule1 @
identifier rule1.fn;
identifier bridge;
statement S, S1;
@@
int fn(
struct drm_bridge *bridge
+ , enum drm_bridge_attach_flags flags
)
{
... when != S
+ if (flags & DRM_BRIDGE_ATTACH_NO_CONNECTOR) {
+ DRM_ERROR("Fix bridge driver to make connector optional!");
+ return -EINVAL;
+ }
+
S1
...
}
@ depends on rule1 @
identifier rule1.fn;
identifier bridge, flags;
expression E1, E2, E3;
@@
int fn(
struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags
) {
<...
drm_bridge_attach(E1, E2, E3
+ , flags
)
...>
}
@@
expression E1, E2, E3;
@@
drm_bridge_attach(E1, E2, E3
+ , 0
)
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Tested-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Reviewed-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200226112514.12455-10-laurent.pinchart@ideasonboard.com
Based on 1 normalized pattern(s):
this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version
extracted by the scancode license scanner the SPDX license identifier
GPL-2.0-or-later
has been chosen to replace the boilerplate/reference in 3029 file(s).
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
The current code, since commit bb43d40d7c ("drm/sun4i: rgb: Validate the
clock rate"), perform some validation on the pixel clock to filter out the
EDID modes provided by monitors (through bridges) that we wouldn't be able
to reach. For the usual modes, we're able to generate a perfect clock rate,
so a strict check was enough.
However, this had the side effect of preventing displays that would work
otherwise to operate properly, since we would pretty much never be able to
generate an exact rate for those displays, even though we would fall within
that panel tolerance.
This was also shown to happen for unusual modes exposed through EDIDs, for
example on eDP panels.
We can work around this by simplifying a bit the problem: no panels we've
encountered so far actually needed that check. All of them are tied to a
particular board when it is produced, and made to work with the Allwinner
BSP. That pretty much guarantees that we never have a pixel clock out of
reach.
On the other hand, the EDIDs modes that needed to be validated have always
been exposed through bridges.
Let's just use that metric to instead of validating all modes, only
validate modes when we have a bridge attached. It should be good enough for
now, while we still have room for improvements or refinements using the
display_timings structure for example for panels.
We also add a tolerance for EDID-based modes instead of doing a strict
check. This tolerance is of 0.5% which is the one advertised in the VESA
DVT and CVT specs. If that needed to be extended in the future, we can add
a custom module parameter to relax it a bit.
Fixes: bb43d40d7c ("drm/sun4i: rgb: Validate the clock rate")
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Tested-by: Vasily Khoruzhick <anarsoul@gmail.com> # tested on pinebook
Reviewed-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/ec2dc2a7b3d4bd44f7a2a6e1c1813f92449a7310.1551191081.git-series.maxime.ripard@bootlin.com
So far, we've required all the TCON-connected encoders to call the TCON
enable and disable functions.
This was made this way because in the RGB/LVDS case, the TCON is the CRTC
and the encoder. However, in all the other cases (HDMI, TV, DSI, etc.), we
have another encoder down the road that needs to be programmed.
We also needed to know which channel the encoder is connected to, which is
encoder-specific.
The CRTC's enable and disable callbacks can work just fine for our use
case, and we can get the channel to use just by looking at the type of
encoder, since that is fixed. Implement those callbacks, which will
remove some of the encoder boilerplate.
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/90b4396e19b3eca61b2ebfdae0672074b88ad74d.1508231063.git-series.maxime.ripard@free-electrons.com
Allwinner DRM changes for 4.14
A few changes, but most notably improving the HDMI support merged in 4.13,
by reporting the DDC adapter as an i2c bus, and by adding CEC support
through the CEC framework.
* tag 'sunxi-drm-for-4.14' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux:
sun4i_hdmi: add CEC support
dt-bindings: display: sunxi: Improve endpoint ID scheme readability
drm/sun4i: tcon: remove unused function
drm/sun4i: Remove useless atomic_check
drm/sun4i: Add if statement instead of depends on
drm/sun4i: hdmi: Implement I2C adapter for A10s DDC bus
drm/sun4i: constify drm_plane_helper_funcs
Make these const as they are only passed to the function
drm_connector_init and the corresponding argument is of type const.
Done using Coccinelle
@match disable optional_qualifier@
identifier s;
@@
static struct drm_connector_funcs s = {...};
@ref@
position p;
identifier match.s;
@@
s@p
@good1@
identifier match.s;
expression e1,e2;
position ref.p;
@@
drm_connector_init(e1,e2,&s@p,...)
@bad depends on !good1@
position ref.p;
identifier match.s;
@@
s@p
@depends on forall !bad disable optional_qualifier@
identifier match.s;
@@
static
+ const
struct drm_connector_funcs s;
Signed-off-by: Bhumika Goyal <bhumirks@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/1502191712-11231-3-git-send-email-bhumirks@gmail.com
The atomic_check callback is optional, and we don't implement anything in
some parts of our drivers. Let's remove it.
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
The muxing can actually happen on both channels on some SoCs, so it makes
more sense to just move it out of the sun4i_tcon1_mode_set function and
create a separate function that needs to be called by the encoders.
Let's do that and convert the existing drivers.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Currently we are configuring the TCON's dot clock or special clock
directly from the encoder mode_set functions. Since we already
provide mode_set helper functions for the TCON's 2 channels, we
can set the respective clock from those helpers, and reduce the
exposure of the TCON's internals.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Allwinner DRM changes for 4.12
Not any functional changes, but a lot of preliminary rework in order to
support multiple display pipelines.
* tag 'sunxi-drm-for-4.12' of https://git.kernel.org/pub/scm/linux/kernel/git/mripard/linux: (26 commits)
MAINTAINERS: Add sun4i-drm git repo
drm/sun4i: Pass pointer for underlying backend into layer init
drm/sun4i: Pass pointers for associated backend and tcon into crtc init
drm/sun4i: tv: Get tcon and backend pointers from associated crtc
drm/sun4i: Use embedded tcon pointer to get the tcon's output port node
drm/sun4i: Fix tcon channel 0 comment about backporch = backporch + hsync
drm/sun4i: Fix TCON clock and regmap initialization sequence
drm/sun4i: Grab reserved memory region
drm/sun4i: Add backend and tcon pointers to sun4i_crtc
drm/sun4i: Add backend pointer to sun4i_layer
drm/sun4i: rgb: Pass tcon pointer when initializing RGB encoder
drm/sun4i: tv: Switch to drm_of_find_possible_crtcs
drm/sun4i: Drop hardcoded .possible_crtcs values from layers
drm/sun4i: Drop primary layer pointer from sun4i_drv
drm/sun4i: Initialize crtc from tcon bind function
drm/sun4i: Move layers from sun4i_drv to sun4i_crtc
drm/sun4i: Add end of list element for sun4i_layers_init's returned list
drm/sun4i: Set drm_crtc.port to the underlying TCON's output port node
drm/sun4i: Make sunxi_rgb2yuv_coef constant
drm/sun4i: Make sun4i_crtc_init return ERR_PTR style error codes
...
Similar to the previous commit, convert drivers open coding OF graph
parsing to use drm_of_find_panel_or_bridge instead.
This changes some error messages to debug messages (in the graph core).
Graph connections are often "no connects" depending on the particular
board, so we want to avoid spurious messages. Plus the kernel is not a
DT validator.
Signed-off-by: Rob Herring <robh@kernel.org>
Reviewed-by: Archit Taneja <architt@codeaurora.org>
Tested-by: Philipp Zabel <p.zabel@pengutronix.de>
Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com>
[seanpaul dropped rockchip changes since they're now obsolete]
Signed-off-by: Sean Paul <seanpaul@chromium.org>
The RGB encoder represents channel 0 of the TCON. Instead of fetching
the pointer to its TCON from the main sun4i_drv structure, pass it in
as part of the init call, save it, and use it directly in the encoder
and connector callbacks.
We can also drop the otherwise unused sun4i_drv pointer.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
To support multiple display pipelines, we would have multiple crtcs,
with one or more planes bound to them. Obviously having hardcoded
values for the drm_plane .possible_crtcs field is not going to work.
For primary and cursor planes, the value is set by
drm_crtc_init_with_planes. We just need to set it for overlay planes.
We also fix the value set for the RGB encoder, by referencing the
crtc set in sun4i_drv.
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Backmerge v4.9-rc8 to get at
commit e94bd1736f
Author: Michel Dänzer <michel.daenzer@amd.com>
Date: Wed Nov 30 17:30:01 2016 +0900
drm: Don't call drm_for_each_crtc with a non-KMS driver
so I can apply Michel's follow-up patch.
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
The panel should be enabled after the controller so that we do not have
visual glitches on the panel while the controller is setup. Similarly,
the panel should be disabled before the controller.
Signed-off-by: Jonathan Liu <net147@gmail.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
We get 5 warnings when building kernel with W=1:
drivers/gpu/drm/sun4i/sun4i_framebuffer.c:33:23: warning: no previous prototype for 'sun4i_framebuffer_init' [-Wmissing-prototypes]
drivers/gpu/drm/sun4i/sun4i_framebuffer.c:47:6: warning: no previous prototype for 'sun4i_framebuffer_free' [-Wmissing-prototypes]
drivers/gpu/drm/sun4i/sun4i_rgb.c:202:5: warning: no previous prototype for 'sun4i_rgb_init' [-Wmissing-prototypes]
drivers/gpu/drm/sun4i/sun4i_dotclock.c:151:5: warning: no previous prototype for 'sun4i_dclk_create' [-Wmissing-prototypes]
drivers/gpu/drm/sun4i/sun4i_dotclock.c:186:5: warning: no previous prototype for 'sun4i_dclk_free' [-Wmissing-prototypes]
In fact, these functions are declared in
drivers/gpu/drm/sun4i/sun4i_framebuffer.h,
drivers/gpu/drm/sun4i/sun4i_rgb.h,
drivers/gpu/drm/sun4i/sun4i_dotclock.h,
so this patch adds missing header dependencies.
Signed-off-by: Baoyou Xie <baoyou.xie@linaro.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
The KMS helpers (drm_atomic_helper_check_modeset/mode_fixup) pass
encoder->bridge directly to drm_bridge_mode_fixup, which expects a
valid pointer, or NULL (in which case it just returns).
Clear encoder->bridge if a bridge is not found, instead of keeping
the ERR_PTR value.
Since other drm_bridge functions also follow this pattern of checking
for a non-NULL pointer, we can drop the ifs around the calls and just
pass the pointer directly.
Fixes: 894f5a9f4b ("drm/sun4i: Add bridge support")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
If the enable-gpios property of a simple panel in device tree is set,
the GPIO is not toggled on/off because of missing calls to
drm_panel_prepare and drm_panel_unprepare.
Signed-off-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Our RGB bus can be either connected to a bridge or a panel. While the panel
support was already there, the bridge was not.
Fix that.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
In order to properly support bridges and use drm_encoder's bridge pointer,
move the panel (and bridge eventually) retrieval code in the RGB output
init function.
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
In case of an error, our pointer to the drm_panel structure attached to our
encoder will hold an error pointer, not a NULL pointer.
Make sure we check the right thing.
Fixes: 29e57fab97 ("drm: sun4i: Add RGB output")
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Our pixel clock cannot reach a high enough rate for some rather high while
common resolutions (like 1080p60).
Make sure we filter the resolutions we cannot reach in our mode_valid
function.
Fixes: 29e57fab97 ("drm: sun4i: Add RGB output")
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
One of the A10 display pipeline possible output is an RGB interface to
drive LCD panels directly. This is done through the first channel of the
TCON that will output our video signals directly.
Reviewed-by: Boris Brezillon <boris.brezillon@free-electrons.com>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
