[v4,11/15] drm/bridge: cdns-csi: Switch to atomic helpers

Commit Message

Maxime Ripard Feb. 25, 2025, 4:43 p.m. UTC

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. Fortunately, the CRTC pointer is now provided
in the bridge state, so we can move to atomic callbacks and drop that
deprecated pointer usage.

Reviewed-by: Dmitry Baryshkov <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>
---
 drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 31 ++++++++++++++++++--------
 1 file changed, 22 insertions(+), 9 deletions(-)

Comments

Dmitry Baryshkov Feb. 26, 2025, 6:12 a.m. UTC | #1

On Tue, Feb 25, 2025 at 05:43:59PM +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. Fortunately, the CRTC pointer is now provided
> in the bridge state, so we can move to atomic callbacks and drop that
> deprecated pointer usage.

Here and in the next several patches: commit message in no longer
accurate. You've dropped the drm_bridge_state.crtc change.

> 
> Reviewed-by: Dmitry Baryshkov <[e-mail]>
> Signed-off-by: Maxime Ripard <[e-mail]>
> ---
>  drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c | 31 ++++++++++++++++++--------
>  1 file changed, 22 insertions(+), 9 deletions(-)
> 

[...]

> -	mode = &bridge->encoder->crtc->state->adjusted_mode;
> +	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
> +	conn_state = drm_atomic_get_new_connector_state(state, connector);
> +	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
> +	mode = &crtc_state->adjusted_mode;
>  	nlanes = output->dev->lanes;
>  
>  	WARN_ON_ONCE(cdns_dsi_check_conf(dsi, mode, &dsi_cfg, false));
>  
>  	cdns_dsi_hs_init(dsi);

Patch

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index 8f54c034ac4f3e82c38607a0e52d4745654b571f..99d43944fb8fc685520b78732cd1181175ff7cc9 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);
@@ -751,17 +753,21 @@  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_connector_state *conn_state;
+	struct drm_crtc_state *crtc_state;
 	struct drm_display_mode *mode;
 	struct phy_configure_opts_mipi_dphy *phy_cfg = &output->phy_opts.mipi_dphy;
+	struct drm_connector *connector;
 	unsigned long tx_byte_period;
 	struct cdns_dsi_cfg dsi_cfg;
 	u32 tmp, reg_wakeup, div;
 	int nlanes;
 
@@ -769,11 +775,14 @@  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;
+	connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder);
+	conn_state = drm_atomic_get_new_connector_state(state, connector);
+	crtc_state = drm_atomic_get_new_crtc_state(state, conn_state->crtc);
+	mode = &crtc_state->adjusted_mode;
 	nlanes = output->dev->lanes;
 
 	WARN_ON_ONCE(cdns_dsi_check_conf(dsi, mode, &dsi_cfg, false));
 
 	cdns_dsi_hs_init(dsi);
@@ -891,11 +900,12 @@  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 +916,17 @@  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)
 {