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Fri, 01 Aug 2025 08:08:10 -0700 (PDT) From: Jun Nie Date: Fri, 01 Aug 2025 23:07:28 +0800 Subject: [PATCH v14 04/13] drm/msm/dpu: fix mixer number counter on allocation Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250801-v6-16-rc2-quad-pipe-upstream-v14-4-b626236f4c31@linaro.org> References: <20250801-v6-16-rc2-quad-pipe-upstream-v14-0-b626236f4c31@linaro.org> In-Reply-To: <20250801-v6-16-rc2-quad-pipe-upstream-v14-0-b626236f4c31@linaro.org> To: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Simona Vetter , Jessica Zhang Cc: linux-arm-msm@vger.kernel.org, dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, linux-kernel@vger.kernel.org, Jun Nie , Dmitry Baryshkov X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1754060859; l=1366; i=jun.nie@linaro.org; s=20240403; h=from:subject:message-id; bh=OO2Z7mIWJju/0AAWi0QFQrEeFkD+xuMhO5TmIsG9bFo=; b=DETqfYzbBAU3+ZrJj8OiSBo60uswBpiJ+Fiol09/aeqJuM42nOixyKlbhgbx+R/Qv/ErHOuBJ OZ4elEmcauaA0/mjq4r+cq1buvaWss0mroaRogcSvaeaex/i2K5+B0T X-Developer-Key: i=jun.nie@linaro.org; a=ed25519; pk=MNiBt/faLPvo+iJoP1hodyY2x6ozVXL8QMptmsKg3cc= Current code only supports usage cases with one pair of mixers at most. To support quad-pipe usage case, two pairs of mixers need to be reserved. The lm_count for all pairs is cleared if a peer allocation fails in current implementation. Reset the current lm_count to an even number instead of completely clearing it. This prevents all pairs from being cleared in cases where multiple LM pairs are needed. Signed-off-by: Jun Nie Reviewed-by: Jessica Zhang Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c b/drivers/gpu/drm/msm/d= isp/dpu1/dpu_rm.c index 2c77c74fac0fda649da8ce19b7b3c6cb32b9535c..3f344322b7f214d0050986e675b= 32522f8eb0ba7 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_rm.c @@ -374,7 +374,11 @@ static int _dpu_rm_reserve_lms(struct dpu_rm *rm, if (!rm->mixer_blks[i]) continue; =20 - lm_count =3D 0; + /* + * Reset lm_count to an even index. This will drop the previous + * primary mixer if failed to find its peer. + */ + lm_count &=3D ~1; lm_idx[lm_count] =3D i; =20 if (!_dpu_rm_check_lm_and_get_connected_blks(rm, global_state, --=20 2.34.1