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Revert "drm/vc4: hdmi: Remove drm_encoder->crtc usage"
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This reverts commit 27da370.

Sudip Mukherjee reports that this broke pulseaudio with a NULL pointer
dereference in vc4_hdmi_audio_prepare(), bisected it to this commit, and
confirmed that a revert fixed the problem.

Revert the problematic commit until fixed.

Link: https://lore.kernel.org/all/CADVatmPB9-oKd=ypvj25UYysVo6EZhQ6bCM7EvztQBMyiZfAyw@mail.gmail.com/
Link: https://lore.kernel.org/all/CADVatmN5EpRshGEPS_JozbFQRXg5w_8LFB3OMP1Ai-ghxd3w4g@mail.gmail.com/
Reported-and-tested-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Cc: Maxime Ripard <maxime@cerno.tech>
Cc: Emma Anholt <emma@anholt.net>
Cc: Dave Airlie <airlied@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@torvalds
torvalds committed Sep 19, 2021
1 parent b1044a9 commit 31ad37b
Showing 1 changed file with 13 additions and 27 deletions.
40 changes: 13 additions & 27 deletions drivers/gpu/drm/vc4/vc4_hdmi.c
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Original file line number Diff line number Diff line change
Expand Up @@ -432,7 +432,7 @@ static void vc4_hdmi_set_avi_infoframe(struct drm_encoder *encoder)
struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_connector_state *cstate = connector->state;
struct drm_crtc *crtc = cstate->crtc;
struct drm_crtc *crtc = encoder->crtc;
const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
union hdmi_infoframe frame;
int ret;
Expand Down Expand Up @@ -537,11 +537,8 @@ static bool vc4_hdmi_supports_scrambling(struct drm_encoder *encoder,

static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_connector_state *cstate = connector->state;
struct drm_crtc *crtc = cstate->crtc;
struct drm_display_mode *mode = &crtc->state->adjusted_mode;

if (!vc4_hdmi_supports_scrambling(encoder, mode))
return;
Expand All @@ -562,18 +559,17 @@ static void vc4_hdmi_enable_scrambling(struct drm_encoder *encoder)
static void vc4_hdmi_disable_scrambling(struct drm_encoder *encoder)
{
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_connector_state *cstate = connector->state;
struct drm_crtc *crtc = encoder->crtc;

/*
* At boot, connector->state will be NULL. Since we don't know the
* At boot, encoder->crtc will be NULL. Since we don't know the
* state of the scrambler and in order to avoid any
* inconsistency, let's disable it all the time.
*/
if (cstate && !vc4_hdmi_supports_scrambling(encoder, &cstate->crtc->mode))
if (crtc && !vc4_hdmi_supports_scrambling(encoder, &crtc->mode))
return;

if (cstate && !vc4_hdmi_mode_needs_scrambling(&cstate->crtc->mode))
if (crtc && !vc4_hdmi_mode_needs_scrambling(&crtc->mode))
return;

if (delayed_work_pending(&vc4_hdmi->scrambling_work))
Expand Down Expand Up @@ -895,9 +891,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
vc4_hdmi_encoder_get_connector_state(encoder, state);
struct vc4_hdmi_connector_state *vc4_conn_state =
conn_state_to_vc4_hdmi_conn_state(conn_state);
struct drm_crtc_state *crtc_state =
drm_atomic_get_new_crtc_state(state, conn_state->crtc);
struct drm_display_mode *mode = &crtc_state->adjusted_mode;
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
unsigned long bvb_rate, pixel_rate, hsm_rate;
int ret;
Expand Down Expand Up @@ -991,11 +985,7 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder,
static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
struct drm_atomic_state *state)
{
struct drm_connector_state *conn_state =
vc4_hdmi_encoder_get_connector_state(encoder, state);
struct drm_crtc_state *crtc_state =
drm_atomic_get_new_crtc_state(state, conn_state->crtc);
struct drm_display_mode *mode = &crtc_state->adjusted_mode;
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);

Expand All @@ -1018,11 +1008,7 @@ static void vc4_hdmi_encoder_pre_crtc_enable(struct drm_encoder *encoder,
static void vc4_hdmi_encoder_post_crtc_enable(struct drm_encoder *encoder,
struct drm_atomic_state *state)
{
struct drm_connector_state *conn_state =
vc4_hdmi_encoder_get_connector_state(encoder, state);
struct drm_crtc_state *crtc_state =
drm_atomic_get_new_crtc_state(state, conn_state->crtc);
struct drm_display_mode *mode = &crtc_state->adjusted_mode;
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct vc4_hdmi *vc4_hdmi = encoder_to_vc4_hdmi(encoder);
struct vc4_hdmi_encoder *vc4_encoder = to_vc4_hdmi_encoder(encoder);
bool hsync_pos = mode->flags & DRM_MODE_FLAG_PHSYNC;
Expand Down Expand Up @@ -1210,8 +1196,8 @@ static void vc4_hdmi_audio_set_mai_clock(struct vc4_hdmi *vc4_hdmi,

static void vc4_hdmi_set_n_cts(struct vc4_hdmi *vc4_hdmi, unsigned int samplerate)
{
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_crtc *crtc = connector->state->crtc;
struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;
struct drm_crtc *crtc = encoder->crtc;
const struct drm_display_mode *mode = &crtc->state->adjusted_mode;
u32 n, cts;
u64 tmp;
Expand Down Expand Up @@ -1244,13 +1230,13 @@ static inline struct vc4_hdmi *dai_to_hdmi(struct snd_soc_dai *dai)
static int vc4_hdmi_audio_startup(struct device *dev, void *data)
{
struct vc4_hdmi *vc4_hdmi = dev_get_drvdata(dev);
struct drm_connector *connector = &vc4_hdmi->connector;
struct drm_encoder *encoder = &vc4_hdmi->encoder.base.base;

/*
* If the HDMI encoder hasn't probed, or the encoder is
* currently in DVI mode, treat the codec dai as missing.
*/
if (!connector->state || !(HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
if (!encoder->crtc || !(HDMI_READ(HDMI_RAM_PACKET_CONFIG) &
VC4_HDMI_RAM_PACKET_ENABLE))
return -ENODEV;

Expand Down

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