diff mbox series

[v7,35/36] drm/sun4i: hdmi: Consolidate atomic_check and mode_valid

Message ID 20240222-kms-hdmi-connector-state-v7-35-8f4af575fce2@kernel.org
State New
Headers
Series drm/connector: Create HDMI Connector infrastructure |

Commit Message

Maxime Ripard Feb. 22, 2024, 6:14 p.m. UTC 
  atomic_check and mode_valid do not check for the same things which can
lead to surprising result if the userspace commits a mode that didn't go
through mode_valid. Let's merge the two implementations into a function
called by both.

Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
---
 drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 74 +++++++++++++++++++++-------------
 1 file changed, 47 insertions(+), 27 deletions(-)

Comments

Jernej Škrabec Feb. 22, 2024, 7:12 p.m. UTC | #1 
Dne četrtek, 22. februar 2024 ob 19:14:21 CET je Maxime Ripard napisal(a):
> atomic_check and mode_valid do not check for the same things which can
> lead to surprising result if the userspace commits a mode that didn't go
> through mode_valid. Let's merge the two implementations into a function
> called by both.
> 
> Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev>
> Signed-off-by: Maxime Ripard <mripard@kernel.org>

Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>

Best regards,
Jernej

> ---
>  drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c | 74 +++++++++++++++++++++-------------
>  1 file changed, 47 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> index c276d984da6b..b7cf369b1906 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
> @@ -62,18 +62,6 @@ static int sun4i_hdmi_setup_avi_infoframes(struct sun4i_hdmi *hdmi,
>  	return 0;
>  }
>  
> -static int sun4i_hdmi_atomic_check(struct drm_encoder *encoder,
> -				   struct drm_crtc_state *crtc_state,
> -				   struct drm_connector_state *conn_state)
> -{
> -	struct drm_display_mode *mode = &crtc_state->mode;
> -
> -	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> -		return -EINVAL;
> -
> -	return 0;
> -}
> -
>  static void sun4i_hdmi_disable(struct drm_encoder *encoder,
>  			       struct drm_atomic_state *state)
>  {
> @@ -166,31 +154,61 @@ static void sun4i_hdmi_enable(struct drm_encoder *encoder,
>  	writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
>  }
>  
> -static enum drm_mode_status sun4i_hdmi_mode_valid(struct drm_encoder *encoder,
> -					const struct drm_display_mode *mode)
> +static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
> +	.atomic_disable	= sun4i_hdmi_disable,
> +	.atomic_enable	= sun4i_hdmi_enable,
> +};
> +
> +static enum drm_mode_status
> +sun4i_hdmi_connector_clock_valid(const struct drm_connector *connector,
> +				 const struct drm_display_mode *mode,
> +				 unsigned long long clock)
>  {
> -	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
> -	unsigned long rate = mode->clock * 1000;
> -	unsigned long diff = rate / 200; /* +-0.5% allowed by HDMI spec */
> +	const struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
> +	unsigned long diff = clock / 200; /* +-0.5% allowed by HDMI spec */
>  	long rounded_rate;
>  
> +	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
> +		return MODE_BAD;
> +
>  	/* 165 MHz is the typical max pixelclock frequency for HDMI <= 1.2 */
> -	if (rate > 165000000)
> +	if (clock > 165000000)
>  		return MODE_CLOCK_HIGH;
> -	rounded_rate = clk_round_rate(hdmi->tmds_clk, rate);
> +
> +	rounded_rate = clk_round_rate(hdmi->tmds_clk, clock);
>  	if (rounded_rate > 0 &&
> -	    max_t(unsigned long, rounded_rate, rate) -
> -	    min_t(unsigned long, rounded_rate, rate) < diff)
> +	    max_t(unsigned long, rounded_rate, clock) -
> +	    min_t(unsigned long, rounded_rate, clock) < diff)
>  		return MODE_OK;
> +
>  	return MODE_NOCLOCK;
>  }
>  
> -static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
> -	.atomic_check	= sun4i_hdmi_atomic_check,
> -	.atomic_disable	= sun4i_hdmi_disable,
> -	.atomic_enable	= sun4i_hdmi_enable,
> -	.mode_valid	= sun4i_hdmi_mode_valid,
> -};
> +static int sun4i_hdmi_connector_atomic_check(struct drm_connector *connector,
> +					     struct drm_atomic_state *state)
> +{
> +	struct drm_connector_state *conn_state =
> +		drm_atomic_get_new_connector_state(state, connector);
> +	struct drm_crtc *crtc = conn_state->crtc;
> +	struct drm_crtc_state *crtc_state = crtc->state;
> +	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
> +	enum drm_mode_status status;
> +
> +	status = sun4i_hdmi_connector_clock_valid(connector, mode,
> +						  mode->clock * 1000);
> +	if (status != MODE_OK)
> +		return -EINVAL;
> +
> +	return 0;
> +}
> +
> +static enum drm_mode_status
> +sun4i_hdmi_connector_mode_valid(struct drm_connector *connector,
> +				struct drm_display_mode *mode)
> +{
> +	return sun4i_hdmi_connector_clock_valid(connector, mode,
> +						mode->clock * 1000);
> +}
>  
>  static int sun4i_hdmi_get_modes(struct drm_connector *connector)
>  {
> @@ -236,6 +254,8 @@ static struct i2c_adapter *sun4i_hdmi_get_ddc(struct device *dev)
>  }
>  
>  static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
> +	.atomic_check	= sun4i_hdmi_connector_atomic_check,
> +	.mode_valid	= sun4i_hdmi_connector_mode_valid,
>  	.get_modes	= sun4i_hdmi_get_modes,
>  };
>  
> 
>
Maxime Ripard Feb. 26, 2024, 9:55 a.m. UTC | #2 
On Thu, 22 Feb 2024 19:14:21 +0100, Maxime Ripard wrote:
> atomic_check and mode_valid do not check for the same things which can
> lead to surprising result if the userspace commits a mode that didn't go
> through mode_valid. Let's merge the two implementations into a function
> called by both.
> 
> 

Applied to drm/drm-misc (drm-misc-next).

Thanks!
Maxime
diff mbox series

Patch

diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
index c276d984da6b..b7cf369b1906 100644
--- a/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
@@ -62,18 +62,6 @@  static int sun4i_hdmi_setup_avi_infoframes(struct sun4i_hdmi *hdmi,
 	return 0;
 }
 
-static int sun4i_hdmi_atomic_check(struct drm_encoder *encoder,
-				   struct drm_crtc_state *crtc_state,
-				   struct drm_connector_state *conn_state)
-{
-	struct drm_display_mode *mode = &crtc_state->mode;
-
-	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
-		return -EINVAL;
-
-	return 0;
-}
-
 static void sun4i_hdmi_disable(struct drm_encoder *encoder,
 			       struct drm_atomic_state *state)
 {
@@ -166,31 +154,61 @@  static void sun4i_hdmi_enable(struct drm_encoder *encoder,
 	writel(val, hdmi->base + SUN4I_HDMI_VID_CTRL_REG);
 }
 
-static enum drm_mode_status sun4i_hdmi_mode_valid(struct drm_encoder *encoder,
-					const struct drm_display_mode *mode)
+static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
+	.atomic_disable	= sun4i_hdmi_disable,
+	.atomic_enable	= sun4i_hdmi_enable,
+};
+
+static enum drm_mode_status
+sun4i_hdmi_connector_clock_valid(const struct drm_connector *connector,
+				 const struct drm_display_mode *mode,
+				 unsigned long long clock)
 {
-	struct sun4i_hdmi *hdmi = drm_encoder_to_sun4i_hdmi(encoder);
-	unsigned long rate = mode->clock * 1000;
-	unsigned long diff = rate / 200; /* +-0.5% allowed by HDMI spec */
+	const struct sun4i_hdmi *hdmi = drm_connector_to_sun4i_hdmi(connector);
+	unsigned long diff = clock / 200; /* +-0.5% allowed by HDMI spec */
 	long rounded_rate;
 
+	if (mode->flags & DRM_MODE_FLAG_DBLCLK)
+		return MODE_BAD;
+
 	/* 165 MHz is the typical max pixelclock frequency for HDMI <= 1.2 */
-	if (rate > 165000000)
+	if (clock > 165000000)
 		return MODE_CLOCK_HIGH;
-	rounded_rate = clk_round_rate(hdmi->tmds_clk, rate);
+
+	rounded_rate = clk_round_rate(hdmi->tmds_clk, clock);
 	if (rounded_rate > 0 &&
-	    max_t(unsigned long, rounded_rate, rate) -
-	    min_t(unsigned long, rounded_rate, rate) < diff)
+	    max_t(unsigned long, rounded_rate, clock) -
+	    min_t(unsigned long, rounded_rate, clock) < diff)
 		return MODE_OK;
+
 	return MODE_NOCLOCK;
 }
 
-static const struct drm_encoder_helper_funcs sun4i_hdmi_helper_funcs = {
-	.atomic_check	= sun4i_hdmi_atomic_check,
-	.atomic_disable	= sun4i_hdmi_disable,
-	.atomic_enable	= sun4i_hdmi_enable,
-	.mode_valid	= sun4i_hdmi_mode_valid,
-};
+static int sun4i_hdmi_connector_atomic_check(struct drm_connector *connector,
+					     struct drm_atomic_state *state)
+{
+	struct drm_connector_state *conn_state =
+		drm_atomic_get_new_connector_state(state, connector);
+	struct drm_crtc *crtc = conn_state->crtc;
+	struct drm_crtc_state *crtc_state = crtc->state;
+	struct drm_display_mode *mode = &crtc_state->adjusted_mode;
+	enum drm_mode_status status;
+
+	status = sun4i_hdmi_connector_clock_valid(connector, mode,
+						  mode->clock * 1000);
+	if (status != MODE_OK)
+		return -EINVAL;
+
+	return 0;
+}
+
+static enum drm_mode_status
+sun4i_hdmi_connector_mode_valid(struct drm_connector *connector,
+				struct drm_display_mode *mode)
+{
+	return sun4i_hdmi_connector_clock_valid(connector, mode,
+						mode->clock * 1000);
+}
 
 static int sun4i_hdmi_get_modes(struct drm_connector *connector)
 {
@@ -236,6 +254,8 @@  static struct i2c_adapter *sun4i_hdmi_get_ddc(struct device *dev)
 }
 
 static const struct drm_connector_helper_funcs sun4i_hdmi_connector_helper_funcs = {
+	.atomic_check	= sun4i_hdmi_connector_atomic_check,
+	.mode_valid	= sun4i_hdmi_connector_mode_valid,
 	.get_modes	= sun4i_hdmi_get_modes,
 };