Re: [PATCH v3 5/5] drm/i915: Add support for DP Video pattern compliance tests

[Manasi Navare <manasi.d.navare@intel.com>]

Jani,

I have addressed all your review comments and using the proper
# defines from the header file for register and masks definitions.
Could you please review this patch?

Regards
Manasi

On Fri, Dec 09, 2016 at 04:33:00PM -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.
> 
> 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.
> 
> 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@intel.com>
> Cc: Jani Nikula <jani.nikula@linux.intel.com>
> Cc: Daniel Vetter <daniel.vetter@intel.com>
> Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/i915_debugfs.c |  9 +++++
>  drivers/gpu/drm/i915/intel_dp.c     | 67 +++++++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/i915/intel_dp_mst.c |  7 +++-
>  drivers/gpu/drm/i915/intel_drv.h    |  3 ++
>  4 files changed, 85 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
> index b2ff532..e87a46d 100644
> --- a/drivers/gpu/drm/i915/i915_debugfs.c
> +++ b/drivers/gpu/drm/i915/i915_debugfs.c
> @@ -4540,6 +4540,15 @@ 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_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index fb6f9e5..5e91bfc 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>
> @@ -1539,6 +1541,12 @@ 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;
> +		DRM_DEBUG_KMS("Setting pipe_bpp to %d\n",
> +			      pipe_config->pipe_bpp);
> +	}
>  	return bpp;
>  }
>  
> @@ -3859,6 +3867,65 @@ 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_MISC_LO,
> +				  &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_TEST_COLOR_FORMAT_SHIFT) !=
> +	    DP_COLOR_FORMAT_RGB)
> +		return test_result;
> +	if (((test_misc & DP_TEST_DYNAMIC_RANGE_MASK) >> DP_TEST_DYNAMIC_RANGE_SHIFT) !=
> +	    DP_VESA_RANGE)
> +		return test_result;
> +	switch ((test_misc & DP_TEST_BIT_DEPTH_MASK) >> DP_TEST_BIT_DEPTH_SHIFT) {
> +	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 dbd580a..fb02e06 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -886,6 +886,9 @@ 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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