HI Rob,

Thanks for the feedback.
Please find my comments inline.

Regards,
Dhanya
On 12/11/2015 9:05 PM, Rob Bradford wrote:
On Fri, 2015-12-11 at 16:01 +0530, Dhanya Pillai wrote:
From: Dhanya <dhanya....@intel.com>

This patch will verify color correction capability of a display
driver.
Gamma/CSC/De-gamma for SKL/BXT supported.

Signed-off-by: Dhanya <dhanya....@intel.com>
---
  tests/.gitignore       |   1 +
  tests/Makefile.sources |   1 +
  tests/kms_color.c      | 684
+++++++++++++++++++++++++++++++++++++++++++++++++
  3 files changed, 686 insertions(+)
  create mode 100644 tests/kms_color.c

diff --git a/tests/.gitignore b/tests/.gitignore
index 80af9a7..58c79e2 100644
--- a/tests/.gitignore
+++ b/tests/.gitignore
@@ -127,6 +127,7 @@ gen7_forcewake_mt
  kms_3d
  kms_addfb_basic
  kms_atomic
+kms_color
  kms_crtc_background_color
  kms_cursor_crc
  kms_draw_crc
diff --git a/tests/Makefile.sources b/tests/Makefile.sources
index 8fb2de8..906c14f 100644
--- a/tests/Makefile.sources
+++ b/tests/Makefile.sources
@@ -64,6 +64,7 @@ TESTS_progs_M = \
        gem_write_read_ring_switch \
        kms_addfb_basic \
        kms_atomic \
+       kms_color \
        kms_cursor_crc \
        kms_draw_crc \
        kms_fbc_crc \
diff --git a/tests/kms_color.c b/tests/kms_color.c
new file mode 100644
index 0000000..b5d199b
--- /dev/null
+++ b/tests/kms_color.c
@@ -0,0 +1,684 @@
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+  * Permission is hereby granted, free of charge, to any person
obtaining a
+ * copy of this software and associated documentation files (the
"Software"),
+ * to deal in the Software without restriction, including without
limitation
+ * the rights to use, copy, modify, merge, publish, distribute,
sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom
the
+ * Software is furnished to do so, subject to the following
conditions:
+ *
+ * The above copyright notice and this permission notice (including
the next
+ * paragraph) shall be included in all copies or substantial
portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO
EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES
OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include <math.h>
+#include "drmtest.h"
+#include "drm.h"
+#include "igt_debugfs.h"
+#include "igt_kms.h"
+#include "igt_core.h"
+#include "intel_io.h"
+#include "intel_chipset.h"
+#include "igt_aux.h"
+#include<unistd.h>
+#include<stdlib.h>
There are quite a few coding style issues found by checkpatch: https://
patchwork.freedesktop.org/series/989/ perhaps you could run
checkpatch.pl locally before sending the next version?

nit: spacing & perhaps system headers should be ahead of igt headers
(check other file coding style)
Will fix these.
+#include <sys/ioctl.h>
+#include <linux/types.h>
+
+
+IGT_TEST_DESCRIPTION("Test Color Features at Pipe level");
+/*
+This tool tests the following color features:
+       1.csc-red
+       2.csc-green
+       3.csc-blue
+       4.gamma-legacy
+       5.gamma-8bit
+       6.gamma-10bit
+       7.gamma-12bit
+       8.gamma-split
+
+Verification is done by CRC checks.
+
+*/
+
+#define CSC_MAX_VALS    9
+#define GEN9_SPLITGAMMA_MAX_VALS                512
+#define GEN9_8BIT_GAMMA_MAX_VALS                256
+#define GEN9_10BIT_GAMMA_MAX_VALS               1024
+#define GEN9_12BIT_GAMMA_MAX_VALS               513
+#define GEN9_MAX_GAMMA                         ((1 << 24) - 1)
+#define GEN9_MIN_GAMMA                         0
GEN9? this functionality is currently enabled for BDW onwards (but I
think in theory could be enabled for HSW)
Will change GEN9 -> BDW.

+#define RED_CSC 0
+#define GREEN_CSC 1
+#define BLUE_CSC 2
+#define RED_FB 0
+#define GREEN_FB 1
+#define BLUE_FB 2
+
+struct _drm_r32g32b32 {
+       __u32 r32;
+       __u32 g32;
+       __u32 b32;
+       __u32 reserved;
+};
+
+struct _drm_palette {
+       struct _drm_r32g32b32 lut[0];
+};
+
+struct _drm_ctm {
+       __s64 ctm_coeff[9];
+};
+
Surround these structure definitions with #ifndefs so that this
continues to work when librdrm gets updated.
Will fix this.
+float ctm_red[9] = {1, 1, 1, 0, 0, 0, 0, 0, 0};
+float ctm_green[9] = {0, 0, 0, 1, 1, 1, 0, 0, 0};
+float ctm_blue[9] = {0, 0, 0, 0, 0, 0, 1, 1, 1};
+float ctm_unity[9] = {1, 0, 0, 0, 1, 0, 0, 0, 1};
These are only used in this file, and never changed: -> static const.

s/unity/identity/ (I think unity is the wrong terminology here.)

I'd like to see versions of the CTM tests that:

a.) Test with negative coefficients
b.) With fractional coeffecients (on BDW the the coefficients are
stored in a funky pseudo fp format. Testing some of those are essential
(testing all even better.)
c.) Swapping red with green would be a good test too.
Will add these tests.
+struct framebuffer_color {
+       int red;
+       int green;
+       int blue;
+};
+struct framebuffer_color fb_color = {0,0,0};
Maybe name this fb_color_black ?
This is just the initialization of the fb.
+
+igt_crc_t crc_reference, crc_reference_black, crc_reference_white;
+igt_crc_t crc_black, crc_white, crc_current;
static ^
Will fix this.
+struct data_t {
+       int fb_initial;
+       int drm_fd;
+       int gen;
+       int w, h;
+       igt_display_t display;
+       struct igt_fb fb_prep;
+       struct igt_fb fb, fb1;
+        igt_pipe_crc_t *pipe_crc;
+       enum pipe pipe;
+
+};
+
+
+static int create_blob(int fd, uint64_t *data, int length)
+{
+       struct drm_mode_create_blob blob;
+       int ret = -1;
+
+       blob.data = (uint64_t)data;
+       blob.length = length;
+       blob.blob_id = -1;
+       ret = ioctl(fd, DRM_IOCTL_MODE_CREATEPROPBLOB, &blob);
+       if (!ret)
+               return blob.blob_id;
+       igt_fail(IGT_EXIT_FAILURE);
+       return ret;
+}
+
+static void prepare_crtc(struct data_t *data, igt_output_t *output,
+                        enum pipe pipe1, igt_plane_t *plane,
drmModeModeInfo *mode,
+                        enum igt_commit_style s)
+{
+       igt_display_t *display = &data->display;
+
+       igt_output_set_pipe(output, pipe1);
+       
+       igt_pipe_crc_free(data->pipe_crc);
+        data->pipe_crc = igt_pipe_crc_new(pipe1,
INTEL_PIPE_CRC_SOURCE_AUTO);
+       
+       /* before allocating, free if any older fb */
+       if (data->fb_initial) {
+               igt_remove_fb(data->drm_fd, &data->fb_prep);
+               data->fb_initial = 0;
+       }
+
+       /* allocate fb for plane 1 */
+       data->fb_initial = igt_create_color_fb(data->drm_fd,
+                                              mode->hdisplay, mode-
vdisplay,
+                                              DRM_FORMAT_XRGB8888,
+                                              LOCAL_I915_FORMAT_MOD
_X_TILED, /* tiled */
+                                              fb_color.red,
fb_color.green, fb_color.blue,
+                                              &data->fb_prep);
+       igt_assert(data->fb_initial);
+
+       igt_plane_set_fb(plane, &data->fb_prep);
+
+       igt_display_commit2(display, s);
+}
+
+static void cleanup_fb(struct data_t *data)
+{
+
+       if (data->fb_initial) {
+               igt_remove_fb(data->drm_fd, &data->fb_prep);
+               data->fb_initial = 0;
+       }
+       if (data->fb.fb_id)
+               igt_remove_fb(data->drm_fd, &data->fb);
+
+}
+
+static void cleanup_crtc(struct data_t *data, igt_output_t *output,
+                        igt_plane_t *plane)
+{
+       igt_display_t *display = &data->display;
+
+       if (!plane->is_primary) {
+               igt_plane_t *primary;
+
+               primary = igt_output_get_plane(output,
IGT_PLANE_PRIMARY);
+               igt_plane_set_fb(primary, NULL);
+       }
+
+       igt_plane_set_fb(plane, NULL);
+       igt_output_set_pipe(output, PIPE_ANY);
+>   igt_display_commit2(display, COMMIT_UNIVERSAL);
+
+}
+
+static int get_color_property(int drm_fd, int id, int object,const
char *prop_name,
+                             int blob_id)
+{
+       int i = 0, ret = 0;
+       drmModeObjectPropertiesPtr props = NULL;
+       igt_fail_on_f(id < 0 || ((object != DRM_MODE_OBJECT_CRTC) &&
+                     (object != DRM_MODE_OBJECT_PLANE)),
+                     "Invalid input to get color property %d", id);
+
+       props = drmModeObjectGetProperties(drm_fd, id, object);
+       igt_fail_on_f(!props,
+                    "\nNo property for object id=%d\n", id);
+       for (i = 0; i < props->count_props; i++) {
+               drmModePropertyPtr prop = drmModeGetProperty(drm_fd,
+                                                            props-
props[i]);
+               if (strcmp(prop->name, prop_name) == 0) {
+                       blob_id = props->prop_values[i];
+                       break;
+               }
+               drmModeFreeProperty(prop);
+       }
+
+       ret = blob_id;
+       drmModeFreeObjectProperties(props);
+       igt_fail_on_f(i == props->count_props,
+                     "%s No such property\n", prop_name);
+       return ret;
+}
+
+
+static int set_color_property(int drm_fd, int id, int object, const
char *prop_name, int blob_id)
+{
+       int i = 0, res;
+
+       drmModeObjectPropertiesPtr props = NULL;
+       igt_fail_on_f(id < 0 || ((object != DRM_MODE_OBJECT_CRTC) &&
+                      (object != DRM_MODE_OBJECT_PLANE)),
+                      "Invalid input to get color property %d", id);
+
+
+       props = drmModeObjectGetProperties(drm_fd, id, object);
+        igt_fail_on_f(!props,
+                     "\nNo property for object id=%d\n", id);
+       for (i = 0; i < props->count_props; i++) {
+               drmModePropertyPtr prop = drmModeGetProperty(drm_fd,
+                                                            props-
props[i]);
+               if (strcmp(prop->name, prop_name) == 0) {
+                       res = drmModeObjectSetProperty(drm_fd, id,
object,
+                                                      (uint32_t)pro
p->prop_id, blob_id);
+
+                       if (res) {
+                               drmModeFreeProperty(prop);
+                               drmModeFreeObjectProperties(props);
+                       } else {
+                               drmModeFreeProperty(prop);
+                               break;
+                       }
+               }
+
+               drmModeFreeProperty(prop);
+       }
+       drmModeFreeObjectProperties(props);
+        igt_fail_on_f(i == props->count_props,
+                      "%s No such property\n", prop_name);
+       return 0;
+}
+
+static int64_t  convertFloatToBinary(double input)
+{
+
+       int integer_part, count = 0;
+       uint32_t temp_ip, frac_val = 0x00000000;
+       uint64_t integer_val = 0x00000000;
+       int64_t  value = 0x0000000000000000;
+       float fractional_part, ip;
+       integer_part = (int)input;
+       fractional_part = input - integer_part;
+       while (fractional_part != 0.000000) {
+               ip = fractional_part * 16;
+               temp_ip = (int)(fractional_part * 16);
+               frac_val = frac_val | (temp_ip << (28 - count * 4));
+               count++;
+               fractional_part = ip - temp_ip;
+       }
+       integer_val = integer_part;
+       value = value | (integer_val << 32);
+       value = value | frac_val;
+       return value;
+
Given the truncation by the HW, I think you can replace this with input
* (1ull << 32). (I think...)
Can you clarify more.
+
+}
+
+static void write_gamma_lut( uint32_t num_samples, struct
_drm_r32g32b32 *gamma_ptr, int unit_gamma )
+{
+       unsigned short Red, Green, Blue;
+       uint32_t r32, b32, g32;
+       uint64_t i,  val;
+
+       for (i = 0; i < num_samples; i++) {
+               if(unit_gamma == 0) {
+               Blue = GEN9_MAX_GAMMA;
+               Green = GEN9_MAX_GAMMA;
+               Red = GEN9_MAX_GAMMA;
+               } else {
+               Blue = GEN9_MIN_GAMMA;
+               Green = GEN9_MIN_GAMMA;
+               Red = GEN9_MIN_GAMMA;
+               }
+               r32 = Red;
+               g32 = Green;
+               b32 = Blue;
+               r32 <<=8;
+               g32 <<=8;
+               b32 <<=8;
+               gamma_ptr[i].r32 = r32;
+               gamma_ptr[i].g32 = g32;
+               gamma_ptr[i].b32 = b32;
+       }
+}
+
+static uint64_t get_blob(int fd, int blob_id, int length)
+{
+       struct drm_mode_get_blob blob;
+       int ret = 0;
+
+       blob.blob_id = blob_id;
+       blob.length = length;
+       blob.data =  (uint64_t)malloc(blob.length);
+       ret = ioctl(fd, DRM_IOCTL_MODE_GETPROPBLOB, &blob);
+
+       if (ret)
+               igt_info("GET BLOB Failed\n");
+
+       return blob.data;
+}
+
+static void enable_plane(struct data_t *data, igt_display_t
*display, igt_output_t *output , int pipe1)
+{
+       enum igt_commit_style commit;
+       enum pipe pipe2;
+        int width, height;
+        uint32_t pixelformat = DRM_FORMAT_XRGB8888;
+
+       commit = COMMIT_UNIVERSAL;
+       for_each_connected_output(display, output) {
+               drmModeModeInfo *mode;
+               igt_plane_t *plane;
+               pipe2 = output->config.pipe;
+
+               if (pipe2 != pipe1)
+                       break;
+               igt_output_set_pipe(output, pipe2);
+               mode = igt_output_get_mode(output);
+               /*Draw the initial primary plane*/
+               plane = igt_output_get_plane(output,
IGT_PLANE_PRIMARY);
+
+               prepare_crtc(data, output, pipe2, plane, mode,
commit);
+               /*Random Size  Buffer Creation */
+               width = 600;
+               height = 600;
+
+               plane = igt_output_get_plane(output, IGT_PLANE_2);
+               igt_create_color_fb(data->drm_fd,
+                                           width, height,
+                                           pixelformat,
+                                           LOCAL_DRM_FORMAT_MOD_NON
E,
+                                           fb_color.red,fb_color.gr
een,fb_color.blue,
+                                           &data->fb);
+               igt_plane_set_position(plane, 100, 100);
+
+               igt_plane_set_fb(plane, &data->fb);
+               igt_display_commit2(display, commit);
+       }
+
+}
+/*
+This function verify csc feature using both CRC check.
+Steps followed are:
+       1.Enable plane for capturing reference CRC
+       2.Capture Reference CRC
+       3.Apply CSC on Pipe
+       4.Enable Plane .CSC will be applied on this planes.
+       5.Capture CRC and compare with reference CRC
+       6. Register Validation for CRC
+*/
+static void test_pipe_csc(struct data_t *data, igt_display_t
*display, igt_output_t *output,
+                         igt_plane_t *plane, bool enable, int
value, int pipe1)
+{
+
+       struct _drm_ctm *ctm_data = NULL;
+       bool ret = false;
+       int res, i, blob_id;
+       float *ctm;
+       uint64_t blob_address;
+       ctm_data = (struct _drm_ctm *)
+               malloc(sizeof(struct _drm_ctm));
+       if (!enable) {
+               ctm = ctm_unity;
+       } else {
+               if (value == RED_CSC) {
+                       ctm = ctm_red;
+               } else if (value == GREEN_CSC) {
+                       ctm = ctm_green;
+               } else if (value == BLUE_CSC) {
+                       ctm = ctm_blue;
+               } else{
+                       ctm = ctm_unity;
+               } }
+       if(value == RED_FB) {
+               fb_color.red = 1;
+               fb_color.green =0;
+               fb_color.blue = 0;
+       } else  if(value == GREEN_FB) {
+               fb_color.red = 0;
+               fb_color.green = 1;
+               fb_color.blue = 0;
+       } else if(value == BLUE_FB) {
+               fb_color.red = 0;
+               fb_color.green = 0;
+               fb_color.blue = 1;
+       } else {
+               fb_color.red = 1;
+               fb_color.green = 1;
+               fb_color.blue = 1;
+       }
+       /*Enable planes and capture reference crc*/
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc, &crc_reference);
+
+       fb_color.red = 1;
+       fb_color.green = 1;
+       fb_color.blue = 1;
+
+       enable_plane(data, display, output, pipe1);
+
+       for (i = 0; i < CSC_MAX_VALS; i++) {
+               ctm_data->ctm_coeff[i] = convertFloatToBinary(*(ctm
+ i));
+       }
+
+       blob_id = create_blob(display->drm_fd,
+                       (int *)(ctm_data), sizeof(struct _drm_ctm));
+       igt_fail_on_f (blob_id < 0, "CTM:BLOB IOCTL Fail\n");
+       res = set_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                       DRM_MODE_OBJECT_CRTC, "CTM", blob_id);
+       igt_fail_on_f (res < 0, "CTM:Set Property Failed\n");
+       res = get_color_property(display->drm_fd, output-
config.crtc->crtc_id, DRM_MODE_OBJECT_CRTC, "CTM", blob_id);
+       igt_fail_on_f (res < 0, "CTM:Get Property Failed\n");
+       
+       blob_address = get_blob(display->drm_fd, res, sizeof(struct
_drm_ctm));
+       ctm_data = (struct _drm_ctm *) (intptr_t) blob_address;
+
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc, &crc_current);
+       igt_assert_crc_equal(&crc_reference, &crc_current);
+       /*Restoring the Unit CSC*/
+       ctm = ctm_unity;
+       for (i = 0; i < CSC_MAX_VALS; i++) {
+               ctm_data->ctm_coeff[i] = convertFloatToBinary(*(ctm
+ i));
+       }
+
+       blob_id = create_blob(display->drm_fd,
+                       (int *)(ctm_data), sizeof(struct _drm_ctm));
+        igt_fail_on_f (blob_id < 0, "CTM:BLOB IOCTL Fail\n");
+
+       res = set_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                       DRM_MODE_OBJECT_CRTC, "CTM", blob_id);
+        igt_fail_on_f (res < 0, "CTM:Set Property Failed\n");
+
+       free(ctm_data);
+
+}
+
+
+static void apply_gamma(struct data_t *data, igt_display_t *display,
igt_output_t *output, int pipe1, uint32_t num_samples, int
unit_gamma)
+{
+       struct _drm_palette *gamma_data =  NULL;
+       int  ret, res, blob_id, blob_length;
+       bool status = false;
+
+
+       if (num_samples == 0)
+               blob_length = 1;
+       else
+               blob_length = (sizeof(struct _drm_palette) +
(num_samples * sizeof(struct _drm_r32g32b32)));
+
+       gamma_data = malloc(blob_length);
+       write_gamma_lut(num_samples, gamma_data->lut, unit_gamma);
+       blob_id = create_blob(display->drm_fd, (uint64_t
*)(gamma_data), blob_length);
+       if (blob_id < 0)
+               free(gamma_data);
+
+        igt_fail_on_f (blob_id < 0, "GAMMA:BLOB IOCTL Fail\n");
+       /*Disabling degamma*/
+       if(unit_gamma == 2 ) {
+               res = set_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                        DRM_MODE_OBJECT_CRTC, "PALETTE_BEFORE_CTM",
blob_id);
+                ret = get_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                        DRM_MODE_OBJECT_CRTC, "PALETTE_BEFORE_CTM",
blob_id);
+                igt_fail_on_f (res < 0, "PALETTE_BEFORE_CTM:Set
Property Failed\n");
+                igt_fail_on_f (ret < 0, "PALETTE_BEFORE_CTM:Set
Property Failed\n");
+
+       }
+
+       if (num_samples == GEN9_SPLITGAMMA_MAX_VALS) {
+               res = set_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                        DRM_MODE_OBJECT_CRTC, "PALETTE_BEFORE_CTM",
blob_id);
+               ret = get_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                        DRM_MODE_OBJECT_CRTC, "PALETTE_BEFORE_CTM",
blob_id);
+               if (res < 0)
+                       free(gamma_data);
+               igt_fail_on_f (res < 0, "PALETTE_BEFORE_CTM:Set
Property Failed\n");
+                igt_fail_on_f (ret < 0, "PALETTE_BEFORE_CTM:Set
Property Failed\n");
+
+       }
+
+       res = set_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                       DRM_MODE_OBJECT_CRTC, "PALETTE_AFTER_CTM",
blob_id);
+       if (res < 0) {
+               free(gamma_data);
+       }
+        igt_fail_on_f (res < 0, "PALETTE_AFTER_CTM:Set Property
Failed\n");
+
+       ret = get_color_property(display->drm_fd, output-
config.crtc->crtc_id,
+                       DRM_MODE_OBJECT_CRTC, "PALETTE_AFTER_CTM",
blob_id);
+       if (ret < 0) {
+               free(gamma_data);
+       }
+        igt_fail_on_f (ret < 0, "PALETTE_BEFORE_CTM:Set Property
Failed\n");
+
+       free(gamma_data);
+
+
+}
+/*
+This function verify csc feature using both CRC check.
+Steps followed are:
+        1.Enable Black plane and capture CRC_REFERENCE_BLACK.
+       2.Enable White plane and capture CRS_REFERENCE_WHITE
+        3.Enable Red plane.
+        4.Apply LOW Gamma.
+        5.Capture CRC_Black.
+        6.Apply High Gamma and capture CRC_White.
+        7.CRC_Black should be equivalent to CRC_REFERENCE_BLACK
+        8.CRC_White should be equivalent to CRC_REFERENCE_WHite.
+
+
+*/
+static void test_pipe_gamma(struct data_t *data, igt_display_t
*display, igt_output_t *output,
+                           uint32_t num_samples, int values, int
pipe1)
+{
+       int unit_gamma, disable_gamma;
+       igt_plane_t *plane;
+
+       /*Enable black planes and capture reference crc*/
+
+       fb_color.red = 0;
+       fb_color.green =0;
+       fb_color.blue = 0;
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc,
&crc_reference_black);
+       /*Enable white plane and capture refernce crc*/
+       fb_color.red = 1;
+       fb_color.green =1;
+       fb_color.blue = 1;
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc,
&crc_reference_white);
+
+       /*Enable red planes and apply unit gamma*/
+       fb_color.red = 1;
+       fb_color.green =0;
+       fb_color.blue = 0;
+       unit_gamma = 0; /*0 -> white 1->black*/
Take the CRC here too, as reference_red and check that crc_white !=
reference_red. (i.e. check its changed)
As suggested by Daniel , not adding  this check here.

+       apply_gamma(data, display, output, pipe1, num_samples,
unit_gamma);
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc, &crc_white);
+
+       /* Apply 0x0 gamma */
+       unit_gamma =  1;
+
+       apply_gamma(data, display, output, pipe1, num_samples,
unit_gamma);
+       enable_plane(data, display, output, pipe1);
+       igt_pipe_crc_collect_crc(data->pipe_crc, &crc_black);
+       igt_assert_crc_equal(&crc_reference_black, &crc_black);
+       igt_assert_crc_equal(&crc_reference_white, &crc_white);
+
+       /*Disabling gamma*/
+       if( num_samples == GEN9_SPLITGAMMA_MAX_VALS) {
+               disable_gamma = 2;
+               apply_gamma(data, display, output, pipe1, 0,
disable_gamma);
+       } else {
+                apply_gamma(data, display, output, pipe1, 0,
unit_gamma);
+       }
+       
+
+
+
+}
+
+static void test_legacy_gamma (struct data_t *data, igt_display_t
*display, igt_output_t *output, int pipe1)
+{
+       int fd,ret,i;
+
+       uint32_t crtc;
+       uint16_t *val = malloc(sizeof(uint16_t) * 256);
+        igt_plane_t *plane;
+
+        fb_color.red = 1;
+        fb_color.green =1;
+        fb_color.blue = 1;
+        enable_plane(data, display, output, pipe1);
nit: coding style (spacing)
Will fix this.

+       float gamma1 = 1.0;
Need to do more that test with a linear gamma, as that is default
initialised in the kernel.
We are doing only negative testing for legacy gamma.
This patch is only meant for Color Manager 3.0 . If required , will add another patch which
does testing for legacy.
+       for(i = 0; i < 256 ; i++) {
+               val[i] = 0xffff * pow((i/255), gamma1);
+
+       }
+       for_each_connected_output (display, output) {
+               ret = drmModeCrtcSetGamma (display->drm_fd, output-
config.crtc->crtc_id, 256, val, val, val);
+               igt_assert_lte(0, ret);
Also, need to do more that check return value. I recommend taking the
CRC with 0xff red FB. Then mapping 0xff red (last entry) to 0xf0 and
then comparing. And the same with other channels and more colours.


+       }
+}
+
+static void test_pipe_color(struct data_t *data, const  char
*prop_name, int enable, int value)
Replace prop_name with an enum. Then you can replace all the strcmp()s
with a switch!
Will add this.
+{
+       igt_display_t *display = &data->display;
+       igt_output_t *output;
+       igt_plane_t *plane;
+       enum pipe pipe1;
+
+       for_each_connected_output(display, output) {
+               pipe1 = output->config.pipe;
+               igt_output_set_pipe(output,pipe1);
+               if ((strcmp(prop_name, "gamma_property_8bit") == 0)
&&
+                               enable == true){
+                       test_pipe_gamma(data, display, output,
+                                       GEN9_8BIT_GAMMA_MAX_VALS,
value, pipe1);
+               } else if ((strcmp(prop_name, "legacy_gamma") ==
0)){
+                       test_legacy_gamma(data, display, output,
pipe1);
+               } else  if ((strcmp(prop_name,
"gamma_property_10bit") == 0) &&
+                               enable == true) {
+                       test_pipe_gamma(data, display, output,
GEN9_10BIT_GAMMA_MAX_VALS, value, pipe1);
+               } else  if ((strcmp(prop_name, "csc_property") ==
0)) {
+                       test_pipe_csc(data, display, output, plane,
enable, value, pipe1);
+               } else  if ((strcmp(prop_name,
"gamma_property_split") == 0) &&
+                               enable == true) {
+                       test_pipe_gamma(data, display, output,
+                                       GEN9_SPLITGAMMA_MAX_VALS,
value, pipe1);
+               } else  if ((strcmp(prop_name,
"gamma_property_12bit") == 0) && enable == true) {
+                       test_pipe_gamma(data, display, output,
+                                       GEN9_12BIT_GAMMA_MAX_VALS,
value, pipe1);
+               } else {
+                       igt_info("Invalid Test\n");
+               }
+               cleanup_fb(data);
+               plane = igt_output_get_plane(output, IGT_PLANE_2);
+               cleanup_crtc(data, output, plane);
+       }
+}
+
+igt_main
+{
+       struct data_t data = {};
+       int values = 1;
+       igt_skip_on_simulation();
+       igt_fixture{
+               //                data.drm_fd =
drm_open_driver_master(DRIVER_INTEL);
Left over debugging comment?
My bad. WIll remove.
+               data.drm_fd = drm_open_any_master();
+               kmstest_set_vt_graphics_mode();
+               igt_display_init(&data.display, data.drm_fd);
+               data.gen =
intel_gen(intel_get_drm_devid(data.drm_fd));
+               igt_require(data.gen >= 9);
9? This feature is enabled from BDW onwards atm, but is possible on
HSW. Can we instead check for the CTM property?
Will remove this check and add for CTM property.
+       }
+       igt_subtest_f("csc-red")
+               test_pipe_color(&data, "csc_property", true,
RED_CSC);
+       igt_subtest_f("csc-green")
+               test_pipe_color(&data, "csc_property", true,
GREEN_CSC);
+       igt_subtest_f("csc-blue")
+               test_pipe_color(&data, "csc_property", true,
BLUE_CSC);
+       igt_subtest_f("gamma-legacy")
+                test_pipe_color(&data, "legacy_gamma", true,
values);
+
+       igt_subtest_f("gamma-8bit")
+               test_pipe_color(&data, "gamma_property_8bit", true,
values);
+       igt_subtest_f("gamma-10bit")
+               test_pipe_color(&data, "gamma_property_10bit", true,
values);
+       igt_subtest_f("gamma-12bit")
+               test_pipe_color(&data, "gamma_property_12bit",
true,  values);
+       igt_subtest_f("gamma-split")
+               test_pipe_color(&data, "gamma_property_split",
true,  values);
+
+       igt_fixture{
+               igt_display_fini(&data.display);
+       }
+}
+
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