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Message-ID: <50781b4b-66dc-27ea-c564-0c383fddb69d@baylibre.com>
Date: Fri, 30 Apr 2021 10:35:04 +0200
From: Neil Armstrong <narmstrong@...libre.com>
To: Liu Ying <victor.liu@....com>, dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, a.hajda@...sung.com,
robert.foss@...aro.org, Laurent.pinchart@...asonboard.com,
jonas@...boo.se, jernej.skrabec@...l.net, airlied@...ux.ie,
daniel@...ll.ch, agx@...xcpu.org, robert.chiras@....com,
linux-imx@....com
Subject: Re: [PATCH v3 1/3] drm/bridge: nwl-dsi: Force a full modeset when
crtc_state->active is changed to be true
On 23/04/2021 11:26, Liu Ying wrote:
> 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@...sung.com>
> Cc: Neil Armstrong <narmstrong@...libre.com>
> Cc: Robert Foss <robert.foss@...aro.org>
> Cc: Laurent Pinchart <Laurent.pinchart@...asonboard.com>
> Cc: Jonas Karlman <jonas@...boo.se>
> Cc: Jernej Skrabec <jernej.skrabec@...l.net>
> Cc: David Airlie <airlied@...ux.ie>
> Cc: Daniel Vetter <daniel@...ll.ch>
> Cc: Guido Günther <agx@...xcpu.org>
> Cc: Robert Chiras <robert.chiras@....com>
> Cc: NXP Linux Team <linux-imx@....com>
> Signed-off-by: Liu Ying <victor.liu@....com>
> ---
> v2->v3:
> * Split from the single patch in v2 to clarify changes. (Neil)
>
> 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 66b67402f1acd..c65ca860712d2 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)
>
Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
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