Re: [PATCH] drm/msm: Fix a7xx per pipe register programming

On 11/27/25 10:57 PM, Akhil P Oommen wrote:

On 11/27/2025 5:16 AM, Anna Maniscalco wrote:

...

GEN7_GRAS_NC_MODE_CNTL was only programmed for BR and not for BV pipe but it needs to be programmed for both.

Program both pipes in hw_init and introducea separate reglist for it in order to add this register to the dynamic reglist which supports restoring registers per pipe.

Fixes: 91389b4e3263 ("drm/msm/a6xx: Add a pwrup_list field to a6xx_info") Signed-off-by: Anna Maniscalco anna.maniscalco2000@gmail.com

---

drivers/gpu/drm/msm/adreno/a6xx_catalog.c | 9 ++- drivers/gpu/drm/msm/adreno/a6xx_gpu.c | 91 +++++++++++++++++++++++++++++-- drivers/gpu/drm/msm/adreno/a6xx_gpu.h | 1 + drivers/gpu/drm/msm/adreno/adreno_gpu.h | 13 +++++ 4 files changed, 109 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c index 29107b362346..c8d0b1d59b68 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_catalog.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_catalog.c @@ -1376,7 +1376,6 @@ static const uint32_t a7xx_pwrup_reglist_regs[] = { REG_A6XX_UCHE_MODE_CNTL, REG_A6XX_RB_NC_MODE_CNTL, REG_A6XX_RB_CMP_DBG_ECO_CNTL,

• REG_A7XX_GRAS_NC_MODE_CNTL, REG_A6XX_RB_CONTEXT_SWITCH_GMEM_SAVE_RESTORE_ENABLE, REG_A6XX_UCHE_GBIF_GX_CONFIG, REG_A6XX_UCHE_CLIENT_PF,

@@ -1448,6 +1447,12 @@ static const u32 a750_ifpc_reglist_regs[] = { DECLARE_ADRENO_REGLIST_LIST(a750_ifpc_reglist); +static const struct adreno_reglist_pipe a750_reglist_pipe_regs[] = {

• { REG_A7XX_GRAS_NC_MODE_CNTL, 0, BIT(PIPE_BV) | BIT(PIPE_BR) },

+};

+DECLARE_ADRENO_REGLIST_PIPE_LIST(a750_reglist_pipe);

• static const struct adreno_info a7xx_gpus[] = { { .chip_ids = ADRENO_CHIP_IDS(0x07000200),

@@ -1548,6 +1553,7 @@ static const struct adreno_info a7xx_gpus[] = { .protect = &a730_protect, .pwrup_reglist = &a7xx_pwrup_reglist, .ifpc_reglist = &a750_ifpc_reglist,

• 	.pipe_reglist = &a750_reglist_pipe,
  .gbif_cx = a640_gbif,
  .gmu_chipid = 0x7050001,
  .gmu_cgc_mode = 0x00020202,
  

@@ -1590,6 +1596,7 @@ static const struct adreno_info a7xx_gpus[] = { .protect = &a730_protect, .pwrup_reglist = &a7xx_pwrup_reglist, .ifpc_reglist = &a750_ifpc_reglist,

• 	.pipe_reglist = &a750_reglist_pipe,
  .gbif_cx = a640_gbif,
  .gmu_chipid = 0x7090100,
  .gmu_cgc_mode = 0x00020202,
  

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c index 0200a7e71cdf..b98f3e93d0a8 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c @@ -16,6 +16,72 @@ #define GPU_PAS_ID 13 +static void a7xx_aperture_slice_set(struct msm_gpu *gpu, enum adreno_pipe pipe) +{

• struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
• struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
• u32 val;
• val = A7XX_CP_APERTURE_CNTL_HOST_PIPE(pipe);
• if (a6xx_gpu->cached_aperture == val)

• return;
  

• gpu_write(gpu, REG_A7XX_CP_APERTURE_CNTL_HOST, val);
• a6xx_gpu->cached_aperture = val;

+}

+static void a7xx_aperture_acquire(struct msm_gpu *gpu, enum adreno_pipe pipe, unsigned long *flags) +{

• struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
• struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
• spin_lock_irqsave(&a6xx_gpu->aperture_lock, *flags);
• a7xx_aperture_slice_set(gpu, pipe);

+}

+static void a7xx_aperture_release(struct msm_gpu *gpu, unsigned long flags) +{

• struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
• struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
• spin_unlock_irqrestore(&a6xx_gpu->aperture_lock, flags);

+}

+static void a7xx_aperture_clear(struct msm_gpu *gpu) +{

• unsigned long flags;
• a7xx_aperture_acquire(gpu, PIPE_NONE, &flags);
• a7xx_aperture_release(gpu, flags);

+}

+static void a7xx_write_pipe(struct msm_gpu *gpu, enum adreno_pipe pipe, u32 offset, u32 data) +{

• unsigned long flags;
• a7xx_aperture_acquire(gpu, pipe, &flags);
• gpu_write(gpu, offset, data);
• a7xx_aperture_release(gpu, flags);

+}

+static u32 a7xx_read_pipe(struct msm_gpu *gpu, enum adreno_pipe pipe, u32 offset) +{

• struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
• struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu);
• unsigned long flags;
• u32 val;
• spin_lock_irqsave(&a6xx_gpu->aperture_lock, flags);
• a7xx_aperture_slice_set(gpu, pipe);
• val = gpu_read(gpu, offset);
• spin_unlock_irqrestore(&a6xx_gpu->aperture_lock, flags);
• return val;

+}

All of the above helper routines are unncessary because we access only a single register under the aperture in a7x hw_init(). Lets drop these and program the aperture register directly below.

We also access (read) it in a7xx_patch_pwrup_reglist though, so do we want to inline it twice?

...

static u64 read_gmu_ao_counter(struct a6xx_gpu *a6xx_gpu) { u64 count_hi, count_lo, temp; @@ -849,9 +915,12 @@ static void a6xx_set_ubwc_config(struct msm_gpu *gpu) min_acc_len_64b << 3 | hbb_lo << 1 | ubwc_mode);

• if (adreno_is_a7xx(adreno_gpu))

• gpu_write(gpu, REG_A7XX_GRAS_NC_MODE_CNTL,
  

• 	  FIELD_PREP(GENMASK(8, 5), hbb_lo));
  

• if (adreno_is_a7xx(adreno_gpu)) {

• for (u32 pipe_id = PIPE_BR; pipe_id <= PIPE_BV; pipe_id++)
  

• 	a7xx_write_pipe(gpu, pipe_id, REG_A7XX_GRAS_NC_MODE_CNTL,
  

• 			FIELD_PREP(GENMASK(8, 5), hbb_lo));
  

• a7xx_aperture_clear(gpu);
  

• }

gpu_write(gpu, REG_A6XX_UCHE_MODE_CNTL, min_acc_len_64b << 23 | hbb_lo << 21); @@ -865,9 +934,11 @@ static void a7xx_patch_pwrup_reglist(struct msm_gpu *gpu) struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu); struct a6xx_gpu *a6xx_gpu = to_a6xx_gpu(adreno_gpu); const struct adreno_reglist_list *reglist;

• const struct adreno_reglist_pipe_list *pipe_reglist; void *ptr = a6xx_gpu->pwrup_reglist_ptr; struct cpu_gpu_lock *lock = ptr; u32 *dest = (u32 *)&lock->regs[0];
• u32 pipe_reglist_count = 0; int i;

lock->gpu_req = lock->cpu_req = lock->turn = 0; @@ -907,7 +978,19 @@ static void a7xx_patch_pwrup_reglist(struct msm_gpu *gpu) * (<aperture, shifted 12 bits> <address> <data>), and the length is * stored as number for triplets in dynamic_list_len. */

• lock->dynamic_list_len = 0;

• pipe_reglist = adreno_gpu->info->a6xx->pipe_reglist;
• for (u32 pipe_id = PIPE_BR; pipe_id <= PIPE_BV; pipe_id++) {

• for (i = 0; i < pipe_reglist->count; i++) {
  

• 	if (pipe_reglist->regs[i].pipe & BIT(pipe_id) == 0)
  

• 		continue;
  

• 	*dest++ = A7XX_CP_APERTURE_CNTL_HOST_PIPE(pipe_id);
  

• 	*dest++ = pipe_reglist->regs[i].offset;
  

• 	*dest++ = a7xx_read_pipe(gpu, pipe_id,
  

• 				 pipe_reglist->regs[i].offset);
  

• 	pipe_reglist_count++;
  

• }
  

• }
• lock->dynamic_list_len = pipe_reglist_count; }

static int a7xx_preempt_start(struct msm_gpu *gpu) diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h index 6820216ec5fc..0a1d6acbc638 100644 --- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.h +++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.h @@ -46,6 +46,7 @@ struct a6xx_info { const struct adreno_protect *protect; const struct adreno_reglist_list *pwrup_reglist; const struct adreno_reglist_list *ifpc_reglist;

• const struct adreno_reglist_pipe_list *pipe_reglist; const struct adreno_reglist *gbif_cx; const struct adreno_reglist_pipe *nonctxt_reglist; u32 max_slices;

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h index 0f8d3de97636..cd1846c1375e 100644 --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h @@ -182,12 +182,25 @@ struct adreno_reglist_list { u32 count; }; +struct adreno_reglist_pipe_list {

• /** @reg: List of register **/
• const struct adreno_reglist_pipe *regs;
• /** @count: Number of registers in the list **/
• u32 count;

+};

Please move this chunk down, just above the DECLARE_ADRENO_REGLIST_PIPE_LIST

-Akhil

...

#define DECLARE_ADRENO_REGLIST_LIST(name) \ static const struct adreno_reglist_list name = { \ .regs = name ## _regs, \ .count = ARRAY_SIZE(name ## _regs), \ }; +#define DECLARE_ADRENO_REGLIST_PIPE_LIST(name) \ +static const struct adreno_reglist_pipe_list name = { \

• .regs = name ## _regs, \
• .count = ARRAY_SIZE(name ## _regs), \

+};

• struct adreno_gpu { struct msm_gpu base; const struct adreno_info *info;

---

base-commit: 7bc29d5fb6faff2f547323c9ee8d3a0790cd2530 change-id: 20251126-gras_nc_mode_fix-7224ee506a39

Best regards,

Best regards,