[PATCH 4/4] drm/i915: Add support for DP Video pattern compliance tests
Manasi Navare
manasi.d.navare at intel.com
Fri Jan 20 06:23:38 UTC 2017
The intel_dp_autotest_video_pattern() function gets invoked through the
compliance test handler on a HPD short pulse if the test type is
set to DP_TEST_VIDEO_PATTERN. This performs the DPCD registers
reads to read the requested test pattern, video pattern resolution,
frame rate and bits per color value. The results of this analysis
are handed off to userspace so that the userspace app can set the
video pattern mode appropriately for the test result/response.
When the test is requested with specific BPC value, we read the BPC
value from the DPCD register. If this BPC value in intel_dp structure
has a non-zero value and we're on a display port connector, then we use
the value to calculate the bpp for the pipe. Also in this case if its
a 18bpp video pattern request, then we force the dithering on pipe to be
disabled since it causes CRC mismatches.
The compliance_test_active flag is set at the end of the individual
test handling functions. This is so that the kernel-side operations
can be completed without the risk of interruption from the userspace
app that is polling on that flag.
v3:
* Use the updated properly shifted bit definitions (Jani Nikula)
* Force dithering to be disabled on 18bpp compliance
test request (Manasi Navare)
v2:
* Updated the DPCD Register reads based on proper defines in header (Jani Nikula)
* Squahsed the patch that forced the pipe bpp to compliance test bpp (Jani Nikula)
Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: Daniel Vetter <daniel.vetter at intel.com>
Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 9 +++++
drivers/gpu/drm/i915/intel_display.c | 8 +++--
drivers/gpu/drm/i915/intel_dp.c | 66 ++++++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/intel_dp_mst.c | 7 +++-
drivers/gpu/drm/i915/intel_drv.h | 11 ++++++
5 files changed, 98 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 8ec7edf..2eb8e50 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -3776,6 +3776,15 @@ static int i915_displayport_test_data_show(struct seq_file *m, void *data)
DP_TEST_LINK_EDID_READ)
seq_printf(m, "%lx",
intel_dp->compliance.test_data.edid);
+ else if (intel_dp->compliance.test_type ==
+ DP_TEST_LINK_VIDEO_PATTERN) {
+ seq_printf(m, "hdisplay: %d\n",
+ intel_dp->compliance.test_data.hdisplay);
+ seq_printf(m, "vdisplay: %d\n",
+ intel_dp->compliance.test_data.vdisplay);
+ seq_printf(m, "bpc: %u\n",
+ intel_dp->compliance.test_data.bpc);
+ }
} else
seq_puts(m, "0");
}
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0f4272f..c593789 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13052,8 +13052,12 @@ static bool check_digital_port_conflicts(struct drm_atomic_state *state)
}
/* Dithering seems to not pass-through bits correctly when it should, so
- * only enable it on 6bpc panels. */
- pipe_config->dither = pipe_config->pipe_bpp == 6*3;
+ * only enable it on 6bpc panels and when its not a compliance
+ * test requesting 6bpc video pattern.
+ */
+ pipe_config->dither = (pipe_config->pipe_bpp == 6*3) &&
+ !pipe_config->dither_force_disable;
+
DRM_DEBUG_KMS("hw max bpp: %i, pipe bpp: %i, dithering: %i\n",
base_bpp, pipe_config->pipe_bpp, pipe_config->dither);
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 7ca45e0..044e36a 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -28,8 +28,10 @@
#include <linux/i2c.h>
#include <linux/slab.h>
#include <linux/export.h>
+#include <linux/types.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
+#include <asm/byteorder.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc.h>
@@ -1593,6 +1595,13 @@ static int intel_dp_compute_bpp(struct intel_dp *intel_dp,
if (bpc > 0)
bpp = min(bpp, 3*bpc);
+ /* For DP Compliance we override the computed bpp for the pipe */
+ if (intel_dp->compliance.test_data.bpc != 0) {
+ pipe_config->pipe_bpp = 3*intel_dp->compliance.test_data.bpc;
+ pipe_config->dither_force_disable = pipe_config->pipe_bpp == 6*3;
+ DRM_DEBUG_KMS("Setting pipe_bpp to %d\n",
+ pipe_config->pipe_bpp);
+ }
return bpp;
}
@@ -3972,6 +3981,63 @@ static uint8_t intel_dp_autotest_link_training(struct intel_dp *intel_dp)
static uint8_t intel_dp_autotest_video_pattern(struct intel_dp *intel_dp)
{
uint8_t test_result = DP_TEST_NAK;
+ uint8_t test_pattern;
+ uint16_t test_misc;
+ __be16 h_width, v_height;
+ int status = 0;
+
+ /* Read the TEST_PATTERN (DP CTS 3.1.5) */
+ status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_PATTERN,
+ &test_pattern, 1);
+ if (status <= 0) {
+ DRM_DEBUG_KMS("Test pattern read failed\n");
+ return 0;
+ }
+ if (test_pattern != DP_COLOR_RAMP)
+ return test_result;
+ intel_dp->compliance.test_data.video_pattern = test_pattern;
+
+ status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_H_WIDTH_HI,
+ &h_width, 2);
+ if (status <= 0) {
+ DRM_DEBUG_KMS("H Width read failed\n");
+ return 0;
+ }
+ intel_dp->compliance.test_data.hdisplay = be16_to_cpu(h_width);
+
+ status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_V_HEIGHT_HI,
+ &v_height, 2);
+ if (status <= 0) {
+ DRM_DEBUG_KMS("V Height read failed\n");
+ return 0;
+ }
+ intel_dp->compliance.test_data.vdisplay = be16_to_cpu(v_height);
+
+ status = drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_MISC0,
+ &test_misc, 1);
+ if (status <= 0) {
+ DRM_DEBUG_KMS("TEST MISC read failed\n");
+ return 0;
+ }
+ if ((test_misc & DP_TEST_COLOR_FORMAT_MASK) != DP_COLOR_FORMAT_RGB)
+ return test_result;
+ if ((test_misc & DP_TEST_DYNAMIC_RANGE) != DP_VESA_RANGE)
+ return test_result;
+ switch (test_misc & DP_TEST_BIT_DEPTH_MASK) {
+ case DP_TEST_BIT_DEPTH_6:
+ intel_dp->compliance.test_data.bpc = 6;
+ break;
+ case DP_TEST_BIT_DEPTH_8:
+ intel_dp->compliance.test_data.bpc = 8;
+ break;
+ default:
+ return test_result;
+ }
+ /* Set test active flag here so userspace doesn't interrupt things */
+ intel_dp->compliance.test_active = 1;
+
+ test_result = DP_TEST_ACK;
+
return test_result;
}
diff --git a/drivers/gpu/drm/i915/intel_dp_mst.c b/drivers/gpu/drm/i915/intel_dp_mst.c
index 205fe47..29a9af1 100644
--- a/drivers/gpu/drm/i915/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/intel_dp_mst.c
@@ -47,6 +47,11 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
pipe_config->has_pch_encoder = false;
bpp = 24;
+ if (intel_dp->compliance.test_data.bpc) {
+ bpp = intel_dp->compliance.test_data.bpc * 3;
+ DRM_DEBUG_KMS("Setting pipe bpp to %d\n",
+ bpp);
+ }
/*
* for MST we always configure max link bw - the spec doesn't
* seem to suggest we should do otherwise.
@@ -55,7 +60,7 @@ static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
pipe_config->lane_count = lane_count;
- pipe_config->pipe_bpp = 24;
+ pipe_config->pipe_bpp = bpp;
pipe_config->port_clock = intel_dp_max_link_rate(intel_dp);
state = pipe_config->base.state;
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1586a02..503e1b5 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -578,6 +578,14 @@ struct intel_crtc_state {
*/
bool dither;
+ /*
+ * Dither gets enabled for 18bpp which causes CRC mismatch errors for
+ * compliance video pattern tests.
+ * Disable dither only if it is a compliance test request for
+ * 18bpp.
+ */
+ bool dither_force_disable;
+
/* Controls for the clock computation, to override various stages. */
bool clock_set;
@@ -888,6 +896,9 @@ struct intel_dp_desc {
struct intel_dp_compliance_data {
unsigned long edid;
+ uint8_t video_pattern;
+ uint16_t hdisplay, vdisplay;
+ uint8_t bpc;
};
struct intel_dp_compliance {
--
1.9.1
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