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Tue, 30 Mar 2021 01:06:25 -0700 (PDT) From: Ikjoon Jang To: linux-usb@vger.kernel.org Cc: Ikjoon Jang , Chunfeng Yun , Greg Kroah-Hartman , Mathias Nyman , Matthias Brugger , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org Subject: [PATCH 1/2] usb: xhci-mtk: remove unnecessary assignments in periodic TT scheduler Date: Tue, 30 Mar 2021 16:06:16 +0800 Message-Id: <20210330160508.1.I797d214790033d0402d19ff6b47a34aff60d3062@changeid> X-Mailer: git-send-email 2.31.0.291.g576ba9dcdaf-goog In-Reply-To: <20210330080617.3746932-1-ikjn@chromium.org> References: <20210330080617.3746932-1-ikjn@chromium.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210330_090632_153792_4A2D578F X-CRM114-Status: GOOD ( 16.19 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Remove unnecessary variables in check_sch_bw(). No functional changes, just for better readability. Signed-off-by: Ikjoon Jang --- drivers/usb/host/xhci-mtk-sch.c | 52 +++++++++++++-------------------- 1 file changed, 21 insertions(+), 31 deletions(-) diff --git a/drivers/usb/host/xhci-mtk-sch.c b/drivers/usb/host/xhci-mtk-sch.c index a59d1f6d4744..0cb41007ec65 100644 --- a/drivers/usb/host/xhci-mtk-sch.c +++ b/drivers/usb/host/xhci-mtk-sch.c @@ -479,6 +479,9 @@ static int check_sch_tt(struct mu3h_sch_ep_info *sch_ep, u32 offset) u32 start_cs, last_cs; int i; + if (!sch_ep->sch_tt) + return 0; + start_ss = offset % 8; if (sch_ep->ep_type == ISOC_OUT_EP) { @@ -606,54 +609,41 @@ static u32 get_esit_boundary(struct mu3h_sch_ep_info *sch_ep) static int check_sch_bw(struct mu3h_sch_bw_info *sch_bw, struct mu3h_sch_ep_info *sch_ep) { - u32 offset; - u32 min_bw; - u32 min_index; - u32 worst_bw; - u32 bw_boundary; - u32 esit_boundary; - u32 min_num_budget; - u32 min_cs_count; - int ret = 0; + int i, found = -1; + const u32 esit_boundary = get_esit_boundary(sch_ep); + const u32 bw_boundary = get_bw_boundary(sch_ep->speed); + u32 min_bw = ~0; /* * Search through all possible schedule microframes. * and find a microframe where its worst bandwidth is minimum. */ - min_bw = ~0; - min_index = 0; - min_cs_count = sch_ep->cs_count; - min_num_budget = sch_ep->num_budget_microframes; - esit_boundary = get_esit_boundary(sch_ep); - for (offset = 0; offset < sch_ep->esit; offset++) { - if (sch_ep->sch_tt) { - ret = check_sch_tt(sch_ep, offset); - if (ret) - continue; - } + for (i = 0; i < sch_ep->esit; i++) { + u32 worst_bw; - if ((offset + sch_ep->num_budget_microframes) > esit_boundary) + if ((i + sch_ep->num_budget_microframes) > esit_boundary) break; - worst_bw = get_max_bw(sch_bw, sch_ep, offset); + if (check_sch_tt(sch_ep, i)) + continue; + + worst_bw = get_max_bw(sch_bw, sch_ep, i); + if (worst_bw > bw_boundary) + continue; + if (min_bw > worst_bw) { min_bw = worst_bw; - min_index = offset; - min_cs_count = sch_ep->cs_count; - min_num_budget = sch_ep->num_budget_microframes; + found = i; } if (min_bw == 0) break; } - bw_boundary = get_bw_boundary(sch_ep->speed); /* check bandwidth */ - if (min_bw > bw_boundary) - return ret ? ret : -ESCH_BW_OVERFLOW; + if (found < 0) + return -ESCH_BW_OVERFLOW; - sch_ep->offset = min_index; - sch_ep->cs_count = min_cs_count; - sch_ep->num_budget_microframes = min_num_budget; + sch_ep->offset = found; return load_ep_bw(sch_bw, sch_ep, true); }