Re: [Freedreno] [PATCH 07/12] drm/msm/adreno: Move speedbin mapping to device table

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On 10/07/2023 22:56, Rob Clark wrote:
On Thu, Jul 6, 2023 at 7:54 PM Dmitry Baryshkov
<dmitry.baryshkov@xxxxxxxxxx> wrote:

On 07/07/2023 00:10, Rob Clark wrote:
From: Rob Clark <robdclark@xxxxxxxxxxxx>

This simplifies the code.

Signed-off-by: Rob Clark <robdclark@xxxxxxxxxxxx>
---
   drivers/gpu/drm/msm/adreno/a6xx_gpu.c      | 171 ++-------------------
   drivers/gpu/drm/msm/adreno/adreno_device.c |  51 ++++++
   drivers/gpu/drm/msm/adreno/adreno_gpu.h    |  25 +++
   3 files changed, 92 insertions(+), 155 deletions(-)


Interesting hack, I'd say.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@xxxxxxxxxx>

Minor nit below.



diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index d5335b99c64c..994ac26ce731 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -72,8 +72,33 @@ struct adreno_info {
       u32 inactive_period;
       const struct adreno_reglist *hwcg;
       u64 address_space_size;
+     /**
+      * @speedbins: Optional table of fuse to speedbin mappings
+      *
+      * Consists of pairs of fuse, index mappings, terminated with
+      * UINT_MAX sentinal.
+      */
+     uint32_t *speedbins;

Would it be better to explicitly list this as pairs of uint32_t? And
then use braces in ADRENO_SPEEDBIN initialisation.

It would mean the sentinel would take 8 bytes instead of 4.. maybe
that is over-thinking it, but it was the reason I just stuck with a
flat table

Guessed so. But we are wasting so much memory already... I think that the paired structure would better reflect the data - it's not a flat list, but a list of nvmem <-> speedbin pairs.


BR,
-R

   };

+/*
+ * Helper to build a speedbin table, ie. the table:
+ *      fuse | speedbin
+ *      -----+---------
+ *        0  |   0
+ *       169 |   1
+ *       174 |   2
+ *
+ * would be declared as:
+ *
+ *     .speedbins = ADRENO_SPEEDBINS(
+ *                      0,   0,
+ *                      169, 1,
+ *                      174, 2
+ *                  ),
+ */
+#define ADRENO_SPEEDBINS(tbl...) (uint32_t[]) { tbl, UINT_MAX }
+
   const struct adreno_info *adreno_info(struct adreno_rev rev);

   struct adreno_gpu {

--
With best wishes
Dmitry


--
With best wishes
Dmitry




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