diff mbox series

[v6,10/12] drm/bridge: cdns-dsi: Move DSI mode check to _atomic_check()

Message ID 20250111192738.308889-11-aradhya.bhatia@linux.dev (mailing list archive)
State New
Headers show
Series drm/bridge: cdns-dsi: Fix the color-shift issue | expand

Commit Message

Aradhya Bhatia Jan. 11, 2025, 7:27 p.m. UTC 
From: Aradhya Bhatia <a-bhatia1@ti.com>

At present, the DSI mode configuration check happens during the
_atomic_enable() phase, which is not really the best place for this.
Moreover, if the mode is not valid, the driver gives a warning and
continues the hardware configuration.

Move the DSI mode configuration check to _atomic_check() instead, which
can properly report back any invalid mode, before the _enable phase even
begins.

Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
Signed-off-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
---
 .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 87 +++++++++++++++++--
 .../gpu/drm/bridge/cadence/cdns-dsi-core.h    |  1 +
 2 files changed, 83 insertions(+), 5 deletions(-)

Comments

Dmitry Baryshkov Jan. 13, 2025, 9:13 a.m. UTC | #1 
On Sun, Jan 12, 2025 at 12:57:36AM +0530, Aradhya Bhatia wrote:
> From: Aradhya Bhatia <a-bhatia1@ti.com>
> 
> At present, the DSI mode configuration check happens during the
> _atomic_enable() phase, which is not really the best place for this.
> Moreover, if the mode is not valid, the driver gives a warning and
> continues the hardware configuration.
> 
> Move the DSI mode configuration check to _atomic_check() instead, which
> can properly report back any invalid mode, before the _enable phase even
> begins.
> 
> Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
> Signed-off-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
> ---
>  .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 87 +++++++++++++++++--
>  .../gpu/drm/bridge/cadence/cdns-dsi-core.h    |  1 +
>  2 files changed, 83 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> index 5db5dbbbcaad..b785df45bc59 100644
> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
> @@ -77,6 +77,7 @@ struct cdns_dsi {
>  	bool link_initialized;
>  	bool phy_initialized;
>  	struct phy *dphy;
> +	struct cdns_dsi_cfg dsi_cfg;

Is this still something necessary / useful? I think the point was to
move dsi_cfg to the state, while this is a non-state struct.

>  };
>  
>  #endif /* !__CDNS_DSI_H__ */
> -- 
> 2.34.1
>
Aradhya Bhatia Jan. 13, 2025, 3:44 p.m. UTC | #2 
On 1/13/25 14:43, Dmitry Baryshkov wrote:
> On Sun, Jan 12, 2025 at 12:57:36AM +0530, Aradhya Bhatia wrote:
>> From: Aradhya Bhatia <a-bhatia1@ti.com>
>>
>> At present, the DSI mode configuration check happens during the
>> _atomic_enable() phase, which is not really the best place for this.
>> Moreover, if the mode is not valid, the driver gives a warning and
>> continues the hardware configuration.
>>
>> Move the DSI mode configuration check to _atomic_check() instead, which
>> can properly report back any invalid mode, before the _enable phase even
>> begins.
>>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@ti.com>
>> Signed-off-by: Aradhya Bhatia <aradhya.bhatia@linux.dev>
>> ---
>>  .../gpu/drm/bridge/cadence/cdns-dsi-core.c    | 87 +++++++++++++++++--
>>  .../gpu/drm/bridge/cadence/cdns-dsi-core.h    |  1 +
>>  2 files changed, 83 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
>> index 5db5dbbbcaad..b785df45bc59 100644
>> --- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
>> +++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
>> @@ -77,6 +77,7 @@ struct cdns_dsi {
>>  	bool link_initialized;
>>  	bool phy_initialized;
>>  	struct phy *dphy;
>> +	struct cdns_dsi_cfg dsi_cfg;
> 
> Is this still something necessary / useful? I think the point was to
> move dsi_cfg to the state, while this is a non-state struct.

No, this isn't necessary. This is a stray piece of code. Looks like I
missed it. Thank you! I will drop this in the next revision.

Regards
Aradhya

> 
>>  };
>>  
>>  #endif /* !__CDNS_DSI_H__ */
>> -- 
>> 2.34.1
>>
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index acef2171719b..b6de0cbba9c2 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -425,6 +425,17 @@ 
 #define DSI_NULL_FRAME_OVERHEAD		6
 #define DSI_EOT_PKT_SIZE		4
 
+struct cdns_dsi_bridge_state {
+	struct drm_bridge_state base;
+	struct cdns_dsi_cfg dsi_cfg;
+};
+
+static inline struct cdns_dsi_bridge_state *
+to_cdns_dsi_bridge_state(struct drm_bridge_state *bridge_state)
+{
+	return container_of(bridge_state, struct cdns_dsi_bridge_state, base);
+}
+
 static inline struct cdns_dsi *input_to_dsi(struct cdns_dsi_input *input)
 {
 	return container_of(input, struct cdns_dsi, input);
@@ -766,6 +777,9 @@  static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
 	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_atomic_state *state = old_bridge_state->base.state;
+	struct cdns_dsi_bridge_state *dsi_state;
+	struct drm_bridge_state *new_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;
@@ -776,14 +790,19 @@  static void cdns_dsi_bridge_atomic_enable(struct drm_bridge *bridge,
 	if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
 		return;
 
+	new_bridge_state = drm_atomic_get_new_bridge_state(state, bridge);
+	if (WARN_ON(!new_bridge_state))
+		return;
+
+	dsi_state = to_cdns_dsi_bridge_state(new_bridge_state);
+	dsi_cfg = dsi_state->dsi_cfg;
+
 	if (dsi->platform_ops && dsi->platform_ops->enable)
 		dsi->platform_ops->enable(dsi);
 
 	mode = &bridge->encoder->crtc->state->adjusted_mode;
 	nlanes = output->dev->lanes;
 
-	WARN_ON_ONCE(cdns_dsi_check_conf(dsi, mode, &dsi_cfg, false));
-
 	cdns_dsi_init_link(dsi);
 	cdns_dsi_hs_init(dsi);
 
@@ -954,6 +973,63 @@  static u32 *cdns_dsi_bridge_get_input_bus_fmts(struct drm_bridge *bridge,
 	return input_fmts;
 }
 
+static int cdns_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 cdns_dsi_input *input = bridge_to_cdns_dsi_input(bridge);
+	struct cdns_dsi *dsi = input_to_dsi(input);
+	struct cdns_dsi_bridge_state *dsi_state = to_cdns_dsi_bridge_state(bridge_state);
+	struct drm_display_mode *mode = &crtc_state->mode;
+	struct cdns_dsi_cfg *dsi_cfg = &dsi_state->dsi_cfg;
+
+	return cdns_dsi_check_conf(dsi, mode, dsi_cfg, false);
+}
+
+static struct drm_bridge_state *
+cdns_dsi_bridge_atomic_duplicate_state(struct drm_bridge *bridge)
+{
+	struct cdns_dsi_bridge_state *dsi_state;
+
+	if (WARN_ON(!bridge->base.state))
+		return NULL;
+
+	dsi_state = kzalloc(sizeof(*dsi_state), GFP_KERNEL);
+	if (!dsi_state)
+		return NULL;
+
+	__drm_atomic_helper_bridge_duplicate_state(bridge, &dsi_state->base);
+
+	return &dsi_state->base;
+}
+
+static void
+cdns_dsi_bridge_atomic_destroy_state(struct drm_bridge *bridge,
+				     struct drm_bridge_state *state)
+{
+	struct cdns_dsi_bridge_state *dsi_state;
+
+	dsi_state = to_cdns_dsi_bridge_state(state);
+
+	kfree(dsi_state);
+}
+
+static struct drm_bridge_state *
+cdns_dsi_bridge_atomic_reset(struct drm_bridge *bridge)
+{
+	struct cdns_dsi_bridge_state *dsi_state;
+
+	dsi_state = kzalloc(sizeof(*dsi_state), GFP_KERNEL);
+	if (!dsi_state)
+		return NULL;
+
+	memset(dsi_state, 0, sizeof(*dsi_state));
+	dsi_state->base.bridge = bridge;
+
+	return &dsi_state->base;
+}
+
 static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
 	.attach = cdns_dsi_bridge_attach,
 	.mode_valid = cdns_dsi_bridge_mode_valid,
@@ -961,9 +1037,10 @@  static const struct drm_bridge_funcs cdns_dsi_bridge_funcs = {
 	.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_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 = cdns_dsi_bridge_atomic_check,
+	.atomic_duplicate_state = cdns_dsi_bridge_atomic_duplicate_state,
+	.atomic_destroy_state = cdns_dsi_bridge_atomic_destroy_state,
+	.atomic_reset = cdns_dsi_bridge_atomic_reset,
 	.atomic_get_input_bus_fmts = cdns_dsi_bridge_get_input_bus_fmts,
 };
 
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
index 5db5dbbbcaad..b785df45bc59 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
@@ -77,6 +77,7 @@  struct cdns_dsi {
 	bool link_initialized;
 	bool phy_initialized;
 	struct phy *dphy;
+	struct cdns_dsi_cfg dsi_cfg;
 };
 
 #endif /* !__CDNS_DSI_H__ */