[PATCH 5.12 007/242] drm/bridge: nwl-dsi: Force a full modeset when crtc_state->active is changed to be true

Greg Kroah-Hartman
2021-07-15T19:05:48Z

From: Liu Ying <victor.liu@nxp.com>

[ Upstream commit 3afb2a28fa2404d11cce1956a003f2aaca4da421 ]

This patch replaces ->mode_fixup() with ->atomic_check() so that
a full modeset can be requested from there when crtc_state->active
is changed to be true(which implies only connector's DPMS is brought
out of "Off" status, though not necessarily). Bridge functions are
added or changed to accommodate the ->atomic_check() callback. That
full modeset is needed by the up-coming patch which gets MIPI DSI
controller and PHY ready in ->mode_set(), because it makes sure
->mode_set() and ->atomic_disable() are called in pairs.

Cc: Andrzej Hajda <a.hajda@samsung.com>
Cc: Neil Armstrong <narmstrong@baylibre.com>
Cc: Robert Foss <robert.foss@linaro.org>
Cc: Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc: Jonas Karlman <jonas@kwiboo.se>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Guido Günther <agx@sigxcpu.org>
Cc: Robert Chiras <robert.chiras@nxp.com>
Cc: NXP Linux Team <linux-imx@nxp.com>
Signed-off-by: Liu Ying <victor.liu@nxp.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1619170003-4817-2-git-send-email-victor.liu@nxp.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/gpu/drm/bridge/nwl-dsi.c | 61 ++++++++++++++++++++------------
1 file changed, 39 insertions(+), 22 deletions(-)

diff --git a/drivers/gpu/drm/bridge/nwl-dsi.c b/drivers/gpu/drm/bridge/nwl-dsi.c
index 66b67402f1ac..c65ca860712d 100644
--- a/drivers/gpu/drm/bridge/nwl-dsi.c
+++ b/drivers/gpu/drm/bridge/nwl-dsi.c
@@ -21,6 +21,7 @@
#include <linux/sys_soc.h>
#include <linux/time64.h>

+#include <drm/drm_atomic_state_helper.h>
#include <drm/drm_bridge.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
@@ -742,7 +743,9 @@ static int nwl_dsi_disable(struct nwl_dsi *dsi)
return 0;
}

-static void nwl_dsi_bridge_disable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct nwl_dsi *dsi = bridge_to_dsi(bridge);
int ret;
@@ -803,17 +806,6 @@ static int nwl_dsi_get_dphy_params(struct nwl_dsi *dsi,
return 0;
}

-static bool nwl_dsi_bridge_mode_fixup(struct drm_bridge *bridge,
- const struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
-{
- /* At least LCDIF + NWL needs active high sync */
- adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
- adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
-
- return true;
-}
-
static enum drm_mode_status
nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
const struct drm_display_info *info,
@@ -831,6 +823,24 @@ nwl_dsi_bridge_mode_valid(struct drm_bridge *bridge,
return MODE_OK;
}

+static int nwl_dsi_bridge_atomic_check(struct drm_bridge *bridge,
+ struct drm_bridge_state *bridge_state,
+ struct drm_crtc_state *crtc_state,
+ struct drm_connector_state *conn_state)
+{
+ struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
+
+ /* At least LCDIF + NWL needs active high sync */
+ adjusted_mode->flags |= (DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC);
+ adjusted_mode->flags &= ~(DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC);
+
+ /* Do a full modeset if crtc_state->active is changed to be true. */
+ if (crtc_state->active_changed && crtc_state->active)
+ crtc_state->mode_changed = true;
+
+ return 0;
+}
+
static void
nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
const struct drm_display_mode *mode,
@@ -862,7 +872,9 @@ nwl_dsi_bridge_mode_set(struct drm_bridge *bridge,
drm_mode_debug_printmodeline(adjusted_mode);
}

-static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct nwl_dsi *dsi = bridge_to_dsi(bridge);
int ret;
@@ -897,7 +909,9 @@ static void nwl_dsi_bridge_pre_enable(struct drm_bridge *bridge)
}
}

-static void nwl_dsi_bridge_enable(struct drm_bridge *bridge)
+static void
+nwl_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
+ struct drm_bridge_state *old_bridge_state)
{
struct nwl_dsi *dsi = bridge_to_dsi(bridge);
int ret;
@@ -942,14 +956,17 @@ static void nwl_dsi_bridge_detach(struct drm_bridge *bridge)
}

static const struct drm_bridge_funcs nwl_dsi_bridge_funcs = {
- .pre_enable = nwl_dsi_bridge_pre_enable,
- .enable = nwl_dsi_bridge_enable,
- .disable = nwl_dsi_bridge_disable,
- .mode_fixup = nwl_dsi_bridge_mode_fixup,
- .mode_set = nwl_dsi_bridge_mode_set,
- .mode_valid = nwl_dsi_bridge_mode_valid,
- .attach = nwl_dsi_bridge_attach,
- .detach = nwl_dsi_bridge_detach,
+ .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_check = nwl_dsi_bridge_atomic_check,
+ .atomic_pre_enable = nwl_dsi_bridge_atomic_pre_enable,
+ .atomic_enable = nwl_dsi_bridge_atomic_enable,
+ .atomic_disable = nwl_dsi_bridge_atomic_disable,
+ .mode_set = nwl_dsi_bridge_mode_set,
+ .mode_valid = nwl_dsi_bridge_mode_valid,
+ .attach = nwl_dsi_bridge_attach,
+ .detach = nwl_dsi_bridge_detach,
};

static int nwl_dsi_parse_dt(struct nwl_dsi *dsi)
--
2.30.2