[igt-dev] [PATCH i-g-t v4 6/8] lib/dsc: Add helpers for VDSC Fractional BPP debugfs entry

Swati Sharma
2023-01-12T07:33:40Z

Helper functions are added for getting/setting VDSC Fractional BPP
debugfs entry.

v2: -improved func description (Ankit)
-increased buff size (Ankit)
-asserted bpp_prec (Ankit)

Signed-off-by: Swati Sharma <swati2.sharma@intel.com>
---
lib/igt_dsc.c | 84 +++++++++++++++++++++++++++++++++++++++++++++++++++
lib/igt_dsc.h | 5 +++
2 files changed, 89 insertions(+)

diff --git a/lib/igt_dsc.c b/lib/igt_dsc.c
index 269d574e9..e5e67a469 100644
--- a/lib/igt_dsc.c
+++ b/lib/igt_dsc.c
@@ -198,3 +198,87 @@ int igt_get_dsc_ycbcr420_debugfs_fd(int drmfd, char *connector_name)

return openat(igt_debugfs_dir(drmfd), file_name, O_WRONLY);
}
+
+static
+bool check_dsc_fractional_bpp_debugfs(int drmfd, char *connector_name,
+ const char *check_str)
+{
+ char file_name[128] = {0};
+ char buf[512];
+
+ sprintf(file_name, "%s/i915_dsc_fractional_bpp", connector_name);
+
+ igt_debugfs_read(drmfd, file_name, buf);
+
+ return strstr(buf, check_str);
+}
+
+/*
+ * igt_get_dsc_fractional_bpp_supported:
+ * @drmfd: A drm file descriptor
+ * @connector_name: Name of the libdrm connector we're going to use
+ *
+ * Returns: The dsc sink bpp precision.
+ * Precision value of
+ * 16 => 1/16
+ * 8 => 1/8
+ * 1 => fractional bpp not supported
+ */
+int igt_get_dsc_fractional_bpp_supported(int drmfd, char *connector_name)
+{
+ char file_name[128] = {0};
+ char buf[512];
+ char *start_loc;
+ int bpp_prec;
+
+ sprintf(file_name, "%s/i915_dsc_fec_support", connector_name);
+ igt_debugfs_read(drmfd, file_name, buf);
+
+ igt_assert(start_loc = strstr(buf, "DSC_Sink_BPP_Precision: "));
+ igt_assert_eq(sscanf(start_loc, "DSC_Sink_BPP_Precision: %d", &bpp_prec), 1);
+ igt_assert(bpp_prec > 0);
+
+ return bpp_prec;
+}
+
+/*
+ * igt_is_force_dsc_fractional_bpp_enabled:
+ * @drmfd: A drm file descriptor
+ * @connector_name: Name of the libdrm connector we're going to use
+ *
+ * Returns: True if DSC Fractional BPP is force enabled (via debugfs) for the given connector,
+ * false otherwise.
+ */
+bool igt_is_force_dsc_fractional_bpp_enabled(int drmfd, char *connector_name)
+{
+ return check_dsc_fractional_bpp_debugfs(drmfd, connector_name, "Force_DSC_Fractional_BPP_Enable: yes");
+}
+
+/*
+ * igt_force_dsc_fractional_bpp_enable:
+ * @drmfd: A drm file descriptor
+ * @connector_name: Name of the libdrm connector we're going to use
+ *
+ * Returns: 1 on success or negative error code, in case of failure.
+ */
+int igt_force_dsc_fractional_bpp_enable(int drmfd, char *connector_name)
+{
+ return write_dsc_debugfs(drmfd, connector_name, "i915_dsc_fractional_bpp", "1");
+}
+
+/*
+ * igt_get_dsc_fractional_bpp_debugfs_fd:
+ * @drmfd: A drm file descriptor
+ * @connector_name: Name of the libdrm connector we're going to use
+ *
+ * Returns: fd of the DSC Fractional BPP debugfs for the given connector,
+ * else returns -1.
+ */
+int igt_get_dsc_fractional_bpp_debugfs_fd(int drmfd, char *connector_name)
+{
+ char file_name[128] = {0};
+
+ sprintf(file_name, "%s/i915_dsc_fractional_bpp", connector_name);
+
+ return openat(igt_debugfs_dir(drmfd), file_name, O_WRONLY);
+}
diff --git a/lib/igt_dsc.h b/lib/igt_dsc.h
index e2b039f42..7dc958406 100644
--- a/lib/igt_dsc.h
+++ b/lib/igt_dsc.h
@@ -7,6 +7,7 @@
#define IGT_DSC_H

#include "igt_fb.h"
+#include "igt_core.h"

bool igt_is_dsc_supported(int drmfd, char *connector_name);
bool igt_is_fec_supported(int drmfd, char *connector_name);
@@ -19,5 +20,9 @@ bool igt_is_dsc_ycbcr420_supported(int drmfd, char *connector_name);
bool igt_is_force_dsc_ycbcr420_enabled(int drmfd, char *connector_name);
int igt_force_dsc_ycbcr420_enable(int drmfd, char *connector_name);
int igt_get_dsc_ycbcr420_debugfs_fd(int drmfd, char *connector_name);
+int igt_get_dsc_fractional_bpp_supported(int drmfd, char *connector_name);
+bool igt_is_force_dsc_fractional_bpp_enabled(int drmfd, char *connector_name);
+int igt_force_dsc_fractional_bpp_enable(int drmfd, char *connector_name);
+int igt_get_dsc_fractional_bpp_debugfs_fd(int drmfd, char *connector_name);

#endif
--
2.25.1