drm/panthor: Simplify getting the GPU model name

This patch replaces the panthor_model structure with a simple switch
case based on the product_id which is in the format of:
        ((arch_major << 24) | product_major)

This simplifies comparison and allows extending of the function to
accommodate naming differences based on supported GPU features.

Reviewed-by: Steven Price <steven.price@arm.com>
Reviewed-by: Chia-I Wu <olvaffe@gmail.com>
Reviewed-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Karunika Choo <karunika.choo@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://lore.kernel.org/r/20250807162633.3666310-3-karunika.choo@arm.com

diff --git a/drivers/gpu/drm/panthor/panthor_hw.c b/drivers/gpu/drm/panthor/panthor_hw.c
index 94f170a8e5c51129e6e3dc5ad233c3cdceee43d7..6bff69fd247e3c3e079e2cb510e6bd2043a3a6eb 100644 (file)
--- a/drivers/gpu/drm/panthor/panthor_hw.c
+++ b/drivers/gpu/drm/panthor/panthor_hw.c
@@ -5,39 +5,22 @@
 #include "panthor_hw.h"
 #include "panthor_regs.h"
 
-/**
- * struct panthor_model - GPU model description
- */
-struct panthor_model {
-       /** @name: Model name. */
-       const char *name;
-
-       /** @arch_major: Major version number of architecture. */
-       u8 arch_major;
-
-       /** @product_major: Major version number of product. */
-       u8 product_major;
-};
-
-/**
- * GPU_MODEL() - Define a GPU model. A GPU product can be uniquely identified
- * by a combination of the major architecture version and the major product
- * version.
- * @_name: Name for the GPU model.
- * @_arch_major: Architecture major.
- * @_product_major: Product major.
- */
-#define GPU_MODEL(_name, _arch_major, _product_major) \
-{\
-       .name = __stringify(_name),                             \
-       .arch_major = _arch_major,                              \
-       .product_major = _product_major,                        \
-}
+#define GPU_PROD_ID_MAKE(arch_major, prod_major) \
+       (((arch_major) << 24) | (prod_major))
+
+static char *get_gpu_model_name(struct panthor_device *ptdev)
+{
+       const u32 gpu_id = ptdev->gpu_info.gpu_id;
+       const u32 product_id = GPU_PROD_ID_MAKE(GPU_ARCH_MAJOR(gpu_id),
+                                               GPU_PROD_MAJOR(gpu_id));
+
+       switch (product_id) {
+       case GPU_PROD_ID_MAKE(10, 7):
+               return "Mali-G610";
+       }
 
-static const struct panthor_model gpu_models[] = {
-       GPU_MODEL(g610, 10, 7),
-       {},
-};
+       return "(Unknown Mali GPU)";
+}
 
 static void panthor_gpu_info_init(struct panthor_device *ptdev)
 {
@@ -68,27 +51,17 @@ static void panthor_gpu_info_init(struct panthor_device *ptdev)
 
 static void panthor_hw_info_init(struct panthor_device *ptdev)
 {
-       const struct panthor_model *model;
-       u32 arch_major, product_major;
        u32 major, minor, status;
 
        panthor_gpu_info_init(ptdev);
 
-       arch_major = GPU_ARCH_MAJOR(ptdev->gpu_info.gpu_id);
-       product_major = GPU_PROD_MAJOR(ptdev->gpu_info.gpu_id);
        major = GPU_VER_MAJOR(ptdev->gpu_info.gpu_id);
        minor = GPU_VER_MINOR(ptdev->gpu_info.gpu_id);
        status = GPU_VER_STATUS(ptdev->gpu_info.gpu_id);
 
-       for (model = gpu_models; model->name; model++) {
-               if (model->arch_major == arch_major &&
-                   model->product_major == product_major)
-                       break;
-       }
-
        drm_info(&ptdev->base,
-                "mali-%s id 0x%x major 0x%x minor 0x%x status 0x%x",
-                model->name ?: "unknown", ptdev->gpu_info.gpu_id >> 16,
+                "%s id 0x%x major 0x%x minor 0x%x status 0x%x",
+                get_gpu_model_name(ptdev), ptdev->gpu_info.gpu_id >> 16,
                 major, minor, status);
 
        drm_info(&ptdev->base,