Re: [PATCH v2 06/18] media: venus: firmware: Leave a clue for homegrown porters

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On 5/5/2023 6:27 PM, Vikash Garodia wrote:

On 5/4/2023 1:31 PM, Konrad Dybcio wrote:
Leave a clue about where the seemingly magic values come from, as it
is not obvious and requires some digging downstream..
Rephrase the commit text.
Reviewed-by: Dikshita Agarwal <quic_dikshita@xxxxxxxxxxx>
Signed-off-by: Konrad Dybcio <konrad.dybcio@xxxxxxxxxx>
Reviewed-by: Vikash Garodia <quic_vgarodia@xxxxxxxxxxx>
---
  drivers/media/platform/qcom/venus/firmware.c | 7 +++++++
  1 file changed, 7 insertions(+)

diff --git a/drivers/media/platform/qcom/venus/firmware.c b/drivers/media/platform/qcom/venus/firmware.c
index cfb11c551167..a4cd919e1dbe 100644
--- a/drivers/media/platform/qcom/venus/firmware.c
+++ b/drivers/media/platform/qcom/venus/firmware.c
@@ -241,6 +241,13 @@ int venus_boot(struct venus_core *core)
          return ret;
        if (core->use_tz && res->cp_size) {
+        /*
+         * Clues for porting using downstream data:
+         * cp_start = 0
+         * cp_size = venus_ns/virtual-addr-pool[0] (yes, addr not size)

The field is the start address of ns context bank. Since the cp_start is 0, the start address for (next) non-secure context bank

is interpreted as size of the (previous) content protection region.

+         * cp_nonpixel_start = venus_sec_non_pixel/virtual-addr-pool[0]
+         * cp_nonpixel_size = venus_sec_non_pixel/virtual-addr-pool[1]
+         */
          ret = qcom_scm_mem_protect_video_var(res->cp_start,
                               res->cp_size,
                               res->cp_nonpixel_start,




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