[PATCH] drm/msm: Fix gen_header.py for older python3 versions

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The gen_header.py script is failing for older versions of python3 such
as python 3.5. Two issues observed with python 3.5 are ...

 1. Python 3 versions prior to 3.6 do not support the f-string format.
 2. Early python 3 versions do not support the 'required' argument for
    the argparse add_subparsers().

Fix both of the above so that older versions of python 3 still work.

Fixes: 8f7abf0b86fe ("drm/msm: generate headers on the fly")
Signed-off-by: Jon Hunter <jonathanh@xxxxxxxxxx>
---
 drivers/gpu/drm/msm/registers/gen_header.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/registers/gen_header.py b/drivers/gpu/drm/msm/registers/gen_header.py
index 9b2842d4a354..90d5c2991d05 100644
--- a/drivers/gpu/drm/msm/registers/gen_header.py
+++ b/drivers/gpu/drm/msm/registers/gen_header.py
@@ -323,7 +323,7 @@ class Array(object):
 			indices = []
 		if self.length != 1:
 			if self.fixed_offsets:
-				indices.append((self.index_ctype(), None, f"__offset_{self.local_name}"))
+				indices.append((self.index_ctype(), None, "__offset_%s" % self.local_name))
 			else:
 				indices.append((self.index_ctype(), self.stride, None))
 		return indices
@@ -942,7 +942,8 @@ def main():
 	parser.add_argument('--rnn', type=str, required=True)
 	parser.add_argument('--xml', type=str, required=True)
 
-	subparsers = parser.add_subparsers(required=True)
+	subparsers = parser.add_subparsers()
+	subparsers.required = True
 
 	parser_c_defines = subparsers.add_parser('c-defines')
 	parser_c_defines.set_defaults(func=dump_c_defines)
-- 
2.34.1




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