Jani,
This patch adds a fix for CRC mismatch errors as well.
The reason I have squashed this fix with this patch is because
these CRC failures are seen for a Video Pattern test.
It uses the approach that we discussed where a piep_config->dither_force_disable
is used to disable dithering for compliance 18bpp case in
intel_modeset_pipe_config.
Regards
Manasi
On Thu, Jan 19, 2017 at 10:23:38PM -0800, Manasi Navare wrote:
> 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.nav...@intel.com>
> Cc: Jani Nikula <jani.nik...@linux.intel.com>
> Cc: Daniel Vetter <daniel.vet...@intel.com>
> Cc: Ville Syrjala <ville.syrj...@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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