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([2a01:e0a:982:cbb0:9dc0:6c46:415c:5f8b]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434a16d96d6sm6722365e9.7.2024.11.25.00.14.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Nov 2024 00:14:22 -0800 (PST) Message-ID: <1965cd01-7b31-4f16-82b2-27fd56fcb77e@linaro.org> Date: Mon, 25 Nov 2024 09:14:22 +0100 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird From: Neil Armstrong Reply-To: neil.armstrong@linaro.org Subject: Re: [PATCH v2 08/11] drm/msm: adreno: request for maximum bus bandwidth usage To: Akhil P Oommen Cc: Viresh Kumar , Nishanth Menon , Stephen Boyd , "Rafael J. Wysocki" , Rob Clark , Sean Paul , Konrad Dybcio , Abhinav Kumar , Dmitry Baryshkov , Marijn Suijten , David Airlie , Simona Vetter , Bjorn Andersson , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Connor Abbott , linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, devicetree@vger.kernel.org References: <20241119-topic-sm8x50-gpu-bw-vote-v2-0-4deb87be2498@linaro.org> <20241119-topic-sm8x50-gpu-bw-vote-v2-8-4deb87be2498@linaro.org> <20241123225954.lv3k2fxk7rxyh67z@hu-akhilpo-hyd.qualcomm.com> Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: <20241123225954.lv3k2fxk7rxyh67z@hu-akhilpo-hyd.qualcomm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 23/11/2024 23:59, Akhil P Oommen wrote: > On Tue, Nov 19, 2024 at 06:56:43PM +0100, Neil Armstrong wrote: >> When requesting a DDR bandwidth level along a GPU frequency >> level via the GMU, we can also specify the bus bandwidth usage in a 16bit >> quantitized value. >> >> For now simply request the maximum bus usage. > > Why? You don't care about power efficiency? > Lets drop this patch. We don't care about AB vote yet. I care about functionality, without this AB vote the spillall use case that fails on SM8650 HDK fails on the SM8650 QRD. AB is a quantitized value of the BW voted, so yes I expect we can have 100% of the BW voted, but since we scale the BW it's perfectly fine. Neil > > -Akhil > >> >> Signed-off-by: Neil Armstrong >> --- >> drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 11 +++++++++++ >> drivers/gpu/drm/msm/adreno/a6xx_hfi.h | 5 +++++ >> 2 files changed, 16 insertions(+) >> >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c >> index dc2d0035544e7848e5c4ea27f1ea9a191f9c4991..36c0f67fd8e109aabf09a0804bacbed3593c39d7 100644 >> --- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c >> @@ -134,6 +134,17 @@ void a6xx_gmu_set_freq(struct msm_gpu *gpu, struct dev_pm_opp *opp, >> if (bw == gmu->gpu_bw_table[bw_index]) >> break; >> } >> + >> + if (bw_index) { >> + /* >> + * Append AB vote to the maximum bus usage. >> + * AB represents a quantitized 16bit value of the >> + * max ddr bandwidth we could use, let's simply >> + * request the maximum for now. >> + */ >> + bw_index |= AB_VOTE(MAX_AB_VOTE); >> + bw_index |= AB_VOTE_ENABLE; >> + } >> } >> >> gmu->current_perf_index = perf_index; >> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.h b/drivers/gpu/drm/msm/adreno/a6xx_hfi.h >> index 528110169398f69f16443a29a1594d19c36fb595..52ba4a07d7b9a709289acd244a751ace9bdaab5d 100644 >> --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.h >> +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.h >> @@ -173,6 +173,11 @@ struct a6xx_hfi_gx_bw_perf_vote_cmd { >> u32 bw; >> }; >> >> +#define AB_VOTE_MASK GENMASK(31, 16) >> +#define MAX_AB_VOTE (FIELD_MAX(AB_VOTE_MASK) - 1) >> +#define AB_VOTE(vote) FIELD_PREP(AB_VOTE_MASK, (vote)) >> +#define AB_VOTE_ENABLE BIT(8) >> + >> #define HFI_H2F_MSG_PREPARE_SLUMBER 33 >> >> struct a6xx_hfi_prep_slumber_cmd { >> >> -- >> 2.34.1 >>