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

Maxime Ripard
2024-02-22T18:40:54Z

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(-)

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,
};

--
2.43.2