On 09/12/2024 13:11, Akhil P Oommen wrote:
On 12/5/2024 8:31 PM, Neil Armstrong wrote:
The Adreno GPU Management Unit (GMU) can also scale the ddr
bandwidth along the frequency and power domain level, but for
now we statically fill the bw_table with values from the
downstream driver.
Only the first entry is used, which is a disable vote, so we
currently rely on scaling via the linux interconnect paths.
Let's dynamically generate the bw_table with the vote values
previously calculated from the OPPs.
Those entries will then be used by the GMU when passing the
appropriate bandwidth level while voting for a gpu frequency.
Signed-off-by: Neil Armstrong <[email protected]>
---
drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 41 ++++++++++++++++++++++++++++++++++-
1 file changed, 40 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
index
cb8844ed46b29c4569d05eb7a24f7b27e173190f..fc4bfad51de9a3b6617fbbd03471a5851d43ce88
100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
@@ -5,7 +5,10 @@
#include <linux/circ_buf.h>
#include <linux/list.h>
+#include <dt-bindings/interconnect/qcom,icc.h>
+
#include <soc/qcom/cmd-db.h>
+#include <soc/qcom/tcs.h>
#include "a6xx_gmu.h"
#include "a6xx_gmu.xml.h"
@@ -259,6 +262,39 @@ static int a6xx_hfi_send_perf_table(struct a6xx_gmu *gmu)
NULL, 0);
}
+static void a6xx_generate_bw_table(const struct a6xx_info *info, struct a6xx_gmu *gmu,
+ struct a6xx_hfi_msg_bw_table *msg)
+{
+ unsigned int i, j;
+
+ msg->ddr_wait_bitmask = QCOM_ICC_TAG_ALWAYS;
Why this is QCOM_ICC_TAG_ALWAYS?
IIRC, this bitmask informs RPMH whether it should wait for previous BCM
vote to complete. Can we implement the same logic from kgsl to create
this bitmask?
Ack, Let me check
+
+ for (i = 0; i < GMU_MAX_BCMS; i++) {
+ if (!info->bcms[i].name)
+ break;
+ msg->ddr_cmds_addrs[i] = cmd_db_read_addr(info->bcms[i].name);
+ }
+ msg->ddr_cmds_num = i;
+
+ for (i = 0; i < gmu->nr_gpu_bws; ++i)
+ for (j = 0; j < msg->ddr_cmds_num; j++)
+ msg->ddr_cmds_data[i][j] = gmu->gpu_ib_votes[i][j];
+ msg->bw_level_num = gmu->nr_gpu_bws;
+
+ /*
+ * These are the CX (CNOC) votes - these are used by the GMU
+ * The 'CN0' BCM is used on all targets, and votes are basically
+ * 'off' and 'on' states with first bit to enable the path.
+ */
+
+ msg->cnoc_cmds_num = 1;
+ msg->cnoc_wait_bitmask = QCOM_ICC_TAG_AMC;
Same here.
Rest looks fine to me.
Thanks,
Neil
-Akhil
+
+ msg->cnoc_cmds_addrs[0] = cmd_db_read_addr("CN0");
+ msg->cnoc_cmds_data[0][0] = BCM_TCS_CMD(true, false, 0, 0);
+ msg->cnoc_cmds_data[1][0] = BCM_TCS_CMD(true, true, 0, BIT(0));
+}
+
static void a618_build_bw_table(struct a6xx_hfi_msg_bw_table *msg)
{
/* Send a single "off" entry since the 618 GMU doesn't do bus scaling */
@@ -664,6 +700,7 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu)
struct a6xx_hfi_msg_bw_table *msg;
struct a6xx_gpu *a6xx_gpu = container_of(gmu, struct a6xx_gpu, gmu);
struct adreno_gpu *adreno_gpu = &a6xx_gpu->base;
+ const struct a6xx_info *info = adreno_gpu->info->a6xx;
if (gmu->bw_table)
goto send;
@@ -672,7 +709,9 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu)
if (!msg)
return -ENOMEM;
- if (adreno_is_a618(adreno_gpu))
+ if (info->bcms && gmu->nr_gpu_bws > 1)
+ a6xx_generate_bw_table(info, gmu, msg);
+ else if (adreno_is_a618(adreno_gpu))
a618_build_bw_table(msg);
else if (adreno_is_a619(adreno_gpu))
a619_build_bw_table(msg);
