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drm/i915: fix intel_prepare_ddi

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At the moment intel_prepare_ddi buffer will iterate through both MST and
CRT encoders, which is incorrect. Neither of these encoder types have an
embedding intel_digital_port object, so for these encoder types we will
use random data when dereferencing the corresponding
intel_digital_port->port field.

Introduced in
commit b403745c84
Author: Damien Lespiau <damien.lespiau@intel.com>
Date:   Mon Aug 4 22:01:33 2014 +0100

    drm/i915: Iterate through the initialized DDIs to prepare their buffers

v2:
- fix getting at the port for MST encoders too
- make sure that intel_prepare_ddi_buffers() gets called for port E too
  (Paulo)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90067
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Imre Deak 2015-04-17 19:31:22 +03:00 committed by Jani Nikula
parent a1e6ad6675
commit faa0cdbec1
2 changed files with 18 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/gpu/drm/i915/i915_drv.h
View File

@ -251,11 +251,6 @@ enum hpd_pin {
&dev->mode_config.connector_list, \
base.head)
#define for_each_digital_port(dev, digital_port) \
list_for_each_entry(digital_port, \
&dev->mode_config.encoder_list, \
base.base.head)
#define for_each_encoder_on_crtc(dev, __crtc, intel_encoder) \
list_for_each_entry((intel_encoder), &(dev)->mode_config.encoder_list, base.head) \
if ((intel_encoder)->base.crtc == (__crtc))

28
drivers/gpu/drm/i915/intel_ddi.c
View File

@ -256,12 +256,11 @@ intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port)
* in either FDI or DP modes only, as HDMI connections will work with both
* of those
*/
static void intel_prepare_ddi_buffers(struct drm_device *dev,
struct intel_digital_port *intel_dig_port)
static void intel_prepare_ddi_buffers(struct drm_device *dev, enum port port,
bool supports_hdmi)
{
struct drm_i915_private *dev_priv = dev->dev_private;
u32 reg;
int port = intel_dig_port->port;
int i, n_hdmi_entries, n_dp_entries, n_edp_entries, hdmi_default_entry,
size;
int hdmi_level = dev_priv->vbt.ddi_port_info[port].hdmi_level_shift;
@ -272,7 +271,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev,
const struct ddi_buf_trans *ddi_translations;
if (IS_BROXTON(dev)) {
if (!intel_dig_port_supports_hdmi(intel_dig_port))
if (!supports_hdmi)
return;
/* Vswing programming for HDMI */
@ -360,7 +359,7 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev,
reg += 4;
}
if (!intel_dig_port_supports_hdmi(intel_dig_port))
if (!supports_hdmi)
return;
/* Choose a good default if VBT is badly populated */
@ -380,18 +379,27 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev,
*/
void intel_prepare_ddi(struct drm_device *dev)
{
struct intel_digital_port *intel_dig_port;
struct intel_encoder *intel_encoder;
bool visited[I915_MAX_PORTS] = { 0, };
if (!HAS_DDI(dev))
return;
for_each_digital_port(dev, intel_dig_port) {
if (visited[intel_dig_port->port])
for_each_intel_encoder(dev, intel_encoder) {
struct intel_digital_port *intel_dig_port;
enum port port;
bool supports_hdmi;
ddi_get_encoder_port(intel_encoder, &intel_dig_port, &port);
if (visited[port])
continue;
intel_prepare_ddi_buffers(dev, intel_dig_port);
visited[intel_dig_port->port] = true;
supports_hdmi = intel_dig_port &&
intel_dig_port_supports_hdmi(intel_dig_port);
intel_prepare_ddi_buffers(dev, port, supports_hdmi);
visited[port] = true;
}
}