[igt-dev] [v3 06/10] lib/dsc: add helpers for vdsc fractional bpp debugfs entry
Swati Sharma
swati2.sharma at intel.com
Thu Jul 27 16:53:57 UTC 2023
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)
v3: -return 0 on success instead of 1 (Jouni)
v4: -rebase
v5: -alignment fixes (Ankit)
Signed-off-by: Swati Sharma <swati2.sharma at intel.com>
Reviewed-by: Ankit Nautiyal <ankit.k.nautiyal at 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 76a420c10..6c3b70421 100644
--- a/lib/igt_dsc.c
+++ b/lib/igt_dsc.c
@@ -205,3 +205,87 @@ int igt_force_dsc_output_format(int drmfd, char *connector_name,
return write_dsc_debugfs(drmfd, connector_name, "i915_dsc_output_format", buf);
}
+
+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: DSC BPP precision supported by the sink.
+ * 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: 0 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 b58743b5f..5d918ea7a 100644
--- a/lib/igt_dsc.h
+++ b/lib/igt_dsc.h
@@ -8,6 +8,7 @@
#include "igt_fb.h"
#include "igt_kms.h"
+#include "igt_core.h"
bool igt_is_dsc_supported_by_source(int drmfd);
bool igt_is_dsc_supported_by_sink(int drmfd, char *connector_name);
@@ -21,5 +22,9 @@ bool igt_is_dsc_output_format_supported_by_sink(int drmfd, char *connector_name,
enum dsc_output_format output_format);
int igt_force_dsc_output_format(int drmfd, char *connector_name,
enum dsc_output_format output_format);
+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
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