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drm/sun4i: hdmi: Consolidate atomic_check and mode_valid

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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>
Reviewed-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Maxime Ripard <mripard@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240222-kms-hdmi-connector-state-v7-35-8f4af575fce2@kernel.org
This commit is contained in:
Maxime Ripard 2024-02-22 19:14:21 +01:00
parent c6686f274d
commit 358e76fd61
No known key found for this signature in database
GPG key ID: E3EF0D6F671851C5
1 changed files with 47 additions and 27 deletions
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74
drivers/gpu/drm/sun4i/sun4i_hdmi_enc.c
View file

@ -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,
};