drm/panfrost: Use upper/lower_32_bits helpers

Use upper_32_bits/lower_32_bits helpers instead of open-coding them.
This is easier to scan quickly compared to bitwise manipulation, and it
is pleasingly symmetric. I noticed this when debugging lock_region,
which had a particularly "creative" way of writing upper_32_bits.

v2: Use helpers for one more call site and add review tag (Steven).
Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Rob Herring <robh@kernel.org> (v1)
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210825153348.4980-1-alyssa.rosenzweig@collabora.com

drivers/gpu/drm/panfrost/panfrost_job.c

@@ -137,8 +137,8 @@ static void panfrost_job_write_affinity(struct panfrost_device *pfdev,
 	 */
 	affinity = pfdev->features.shader_present;
 
-	job_write(pfdev, JS_AFFINITY_NEXT_LO(js), affinity & 0xFFFFFFFF);
-	job_write(pfdev, JS_AFFINITY_NEXT_HI(js), affinity >> 32);
+	job_write(pfdev, JS_AFFINITY_NEXT_LO(js), lower_32_bits(affinity));
+	job_write(pfdev, JS_AFFINITY_NEXT_HI(js), upper_32_bits(affinity));
 }
 
 static u32
@@ -203,8 +203,8 @@ static void panfrost_job_hw_submit(struct panfrost_job *job, int js)
 
 	cfg = panfrost_mmu_as_get(pfdev, job->file_priv->mmu);
 
-	job_write(pfdev, JS_HEAD_NEXT_LO(js), jc_head & 0xFFFFFFFF);
-	job_write(pfdev, JS_HEAD_NEXT_HI(js), jc_head >> 32);
+	job_write(pfdev, JS_HEAD_NEXT_LO(js), lower_32_bits(jc_head));
+	job_write(pfdev, JS_HEAD_NEXT_HI(js), upper_32_bits(jc_head));
 
 	panfrost_job_write_affinity(pfdev, job->requirements, js);
 

drivers/gpu/drm/panfrost/panfrost_mmu.c

@@ -80,8 +80,8 @@ static void lock_region(struct panfrost_device *pfdev, u32 as_nr,
 	region |= region_width;
 
 	/* Lock the region that needs to be updated */
-	mmu_write(pfdev, AS_LOCKADDR_LO(as_nr), region & 0xFFFFFFFFUL);
-	mmu_write(pfdev, AS_LOCKADDR_HI(as_nr), (region >> 32) & 0xFFFFFFFFUL);
+	mmu_write(pfdev, AS_LOCKADDR_LO(as_nr), lower_32_bits(region));
+	mmu_write(pfdev, AS_LOCKADDR_HI(as_nr), upper_32_bits(region));
 	write_cmd(pfdev, as_nr, AS_COMMAND_LOCK);
 }
 
@@ -123,14 +123,14 @@ static void panfrost_mmu_enable(struct panfrost_device *pfdev, struct panfrost_m
 
 	mmu_hw_do_operation_locked(pfdev, as_nr, 0, ~0UL, AS_COMMAND_FLUSH_MEM);
 
-	mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), transtab & 0xffffffffUL);
-	mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), transtab >> 32);
+	mmu_write(pfdev, AS_TRANSTAB_LO(as_nr), lower_32_bits(transtab));
+	mmu_write(pfdev, AS_TRANSTAB_HI(as_nr), upper_32_bits(transtab));
 
 	/* Need to revisit mem attrs.
 	 * NC is the default, Mali driver is inner WT.
 	 */
-	mmu_write(pfdev, AS_MEMATTR_LO(as_nr), memattr & 0xffffffffUL);
-	mmu_write(pfdev, AS_MEMATTR_HI(as_nr), memattr >> 32);
+	mmu_write(pfdev, AS_MEMATTR_LO(as_nr), lower_32_bits(memattr));
+	mmu_write(pfdev, AS_MEMATTR_HI(as_nr), upper_32_bits(memattr));
 
 	write_cmd(pfdev, as_nr, AS_COMMAND_UPDATE);
 }

drivers/gpu/drm/panfrost/panfrost_perfcnt.c

@@ -51,8 +51,8 @@ static int panfrost_perfcnt_dump_locked(struct panfrost_device *pfdev)
 
 	reinit_completion(&pfdev->perfcnt->dump_comp);
 	gpuva = pfdev->perfcnt->mapping->mmnode.start << PAGE_SHIFT;
-	gpu_write(pfdev, GPU_PERFCNT_BASE_LO, gpuva);
-	gpu_write(pfdev, GPU_PERFCNT_BASE_HI, gpuva >> 32);
+	gpu_write(pfdev, GPU_PERFCNT_BASE_LO, lower_32_bits(gpuva));
+	gpu_write(pfdev, GPU_PERFCNT_BASE_HI, upper_32_bits(gpuva));
 	gpu_write(pfdev, GPU_INT_CLEAR,
 		  GPU_IRQ_CLEAN_CACHES_COMPLETED |
 		  GPU_IRQ_PERFCNT_SAMPLE_COMPLETED);