On Tue, Feb 04, 2025 at 03:58:00PM +0100, Maxime Ripard wrote:
> The Cadence DSI driver follows the drm_encoder->crtc pointer that is
> deprecated and shouldn't be used by atomic drivers.
>
> This was due to the fact that we did't have any other alternative to
> retrieve the CRTC pointer.
See below.
> Fortunately, the crtc pointer is now provided
Nit: CRTC
> in the bridge state, so we can move to atomic callbacks and drop that
> deprecated pointer usage.
>
> Signed-off-by: Maxime Ripard <mripard@kernel.org>
> ---
> drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 27 +++++++++++++++++---------
> 1 file changed, 18 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> index 8f54c034ac4f3e82c38607a0e52d4745654b571f..c856e7843f83b363340443dec1deb26c9ae1b912 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
> @@ -654,11 +654,12 @@ cdns_dsi_bridge_mode_valid(struct drm_bridge *bridge,
> return MODE_BAD;
>
> return MODE_OK;
> }
>
> -static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
> +static void cdns_dsi_bridge_atomic_disable(struct drm_bridge *bridge,
> + struct drm_atomic_state *state)
> {
> struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> struct cdns_dsi *dsi = input_to_dsi(input);
> u32 val;
>
> @@ -674,11 +675,12 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)
> dsi->platform_ops->disable(dsi);
>
> pm_runtime_put(dsi->base.dev);
> }
>
> -static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
> +static void cdns_dsi_bridge_atomic_post_disable(struct drm_bridge *bridge,
> + struct drm_atomic_state *state)
> {
> struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> struct cdns_dsi *dsi = input_to_dsi(input);
>
> pm_runtime_put(dsi->base.dev);
> @@ -751,15 +753,17 @@ static void cdns_dsi_init_link(struct cdns_dsi *dsi)
> writel(val, dsi->regs + MCTL_MAIN_EN);
>
> dsi->link_initialized = true;
> }
>
> -static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
> +static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
> + struct drm_atomic_state *state)
> {
> struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> struct cdns_dsi *dsi = input_to_dsi(input);
> struct cdns_dsi_output *output = &dsi->output;
> + struct drm_bridge_state *bridge_state;
> struct drm_display_mode *mode;
> struct phy_configure_opts_mipi_dphy *phy_cfg = &output->phy_opts.mipi_dphy;
> unsigned long tx_byte_period;
> struct cdns_dsi_cfg dsi_cfg;
> u32 tmp, reg_wakeup, div;
> @@ -769,11 +773,12 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
> return;
>
> if (dsi->platform_ops && dsi->platform_ops->enable)
> dsi->platform_ops->enable(dsi);
>
> - mode = &bridge->encoder->crtc->state->adjusted_mode;
> + bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
> + mode = &bridge_state->crtc->state->adjusted_mode;
And then it also follows crtc->state, which might fail for non-blocking
commits.
I think a proper way would be to
connector = drm_atomic_get_new_connector_for_encoder(state, encoder);
conn_state = drm_atomic_get_new_connector_state(state, connector);
crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> nlanes = output->dev->lanes;
>
> WARN_ON_ONCE(cdns_dsi_check_conf(dsi, mode, &dsi_cfg, false));
>
> cdns_dsi_hs_init(dsi);
> @@ -891,11 +896,12 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
>
> tmp = readl(dsi->regs + MCTL_MAIN_EN) | IF_EN(input->id);
> writel(tmp, dsi->regs + MCTL_MAIN_EN);
> }
>
> -static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> +static void cdns_dsi_bridge_atomic_pre_enable(struct drm_bridge *bridge,
> + struct drm_atomic_state *state)
> {
> struct cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
> struct cdns_dsi *dsi = input_to_dsi(input);
>
> if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
> @@ -906,14 +912,17 @@ static void cdns_dsi_bridge_pre_enable(struct drm_bridge *bridge)
> }
>
> static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
> .attach = cdns_dsi_bridge_attach,
> .mode_valid = cdns_dsi_bridge_mode_valid,
> - .disable = cdns_dsi_bridge_disable,
> - .pre_enable = cdns_dsi_bridge_pre_enable,
> - .enable = cdns_dsi_bridge_enable,
> - .post_disable = cdns_dsi_bridge_post_disable,
> + .atomic_disable = cdns_dsi_bridge_atomic_disable,
> + .atomic_pre_enable = cdns_dsi_bridge_atomic_pre_enable,
> + .atomic_enable = cdns_dsi_bridge_atomic_enable,
> + .atomic_post_disable = cdns_dsi_bridge_atomic_post_disable,
> + .atomic_reset = drm_atomic_helper_bridge_reset,
> + .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
> + .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
> };
>
> static int cdns_dsi_attach(struct mipi_dsi_host *host,
> struct mipi_dsi_device *dev)
> {
>
> --
> 2.48.0
>
--
With best wishes
Dmitry