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[2001:8b0:1d0::2]) by smtp.gmail.com with ESMTPSA id bi12-20020a05600c3d8c00b003974b95d897sm10232152wmb.37.2022.05.30.09.07.11 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 30 May 2022 09:07:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=lKRJrIgeaUwwXJZeQ6utUWAPa0M3UoWr4zCBZlSuKrQ=; b=nnGJUoR1pe2AtKF4AS+uHIpw3GvqBm7CcyZQ7HecJvP5Tlgwq+NzJk2BjJDNZuNo6J czMpOxWFymuvMV8VOrskc7GEH5hECZy1Rj8nMjNIyGPlBZOPspmc5lMW4rn47ijVr0QW FKpVRx7Vnh9vlTB5XXa7Anz8Z9Pb3qvvSAjXa975DxRUzW4S49sVUNU7KbRHqg4DOtmF iI5AmF5MpE9kMXMSSYSugJSXx+QnX+fMw8TpdeRYeFVy+3X3cnCvfP5SJfrbep6QZfjN 9VM3+McwbOpzZdATkJGPeqrxj7UCKPfOnRQlJq6fGFe9qqLpgv/kHz7QAhxXTj3XH2Ox CMJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=lKRJrIgeaUwwXJZeQ6utUWAPa0M3UoWr4zCBZlSuKrQ=; b=WgG35KXKgpXro9jyrRNEvQBaPcYt80zFxB4xbN/vJY7348ZkCnI65whmOJi68LvG2s lvRCq7yTlZlcQNH3tyjyIZemYhIKKFc0onFMuRWqeeYlLR6KGDYZaBQBWsMhmWyjiVKL IWawKnwMNHZucyvRBJDIuP5ZQ1udFPcBdaxGL3szaW1CXB4QSkRPmpYIf5mvRowsywIk epCc4hzaUYHzwfrptVpq0ZG8Es3UMe8QEBw0mnjp+TL/aCsef9FexqP1XpZFFGIExWge K4pI6uHEAWEEK23pKY1CAbxiZQUpNbZiAUmkB4uIp+eABOHjq7PjrRYI+TJ+ekq3Vd6Q p1ww== X-Gm-Message-State: AOAM533eVlUvcogDbrnbwpCfzYeT/v43hZHA2FTogwp8nejfHOXUoJsg 1cz0YeIoaTNt8WwJU8s31rMJ0rZNzt6xCA== X-Google-Smtp-Source: ABdhPJxCTBETsum1AOL/Ay90ZyuunO+7KbiiE/fyk73ocQUV7/zSWakVXABYq2ifaEXvQfLaIS/Luw== X-Received: by 2002:a5d:6c66:0:b0:20f:86f3:ea05 with SMTP id r6-20020a5d6c66000000b0020f86f3ea05mr40690832wrz.154.1653926832550; Mon, 30 May 2022 09:07:12 -0700 (PDT) From: Peter Maydell To: qemu-devel@nongnu.org Subject: [PULL 003/117] hw/sd/allwinner-sdhost: report FIFO water level as 1 when data ready Date: Mon, 30 May 2022 17:05:14 +0100 Message-Id: <20220530160708.726466-4-peter.maydell@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220530160708.726466-1-peter.maydell@linaro.org> References: <20220530160708.726466-1-peter.maydell@linaro.org> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a00:1450:4864:20::430; envelope-from=peter.maydell@linaro.org; helo=mail-wr1-x430.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @linaro.org) X-ZM-MESSAGEID: 1653927479916100001 Content-Type: text/plain; charset="utf-8" From: Icenowy Zheng U-Boot queries the FIFO water level to reduce checking status register when doing PIO SD card operation. Report a FIFO water level of 1 when data is ready, to prevent the code from trying to read 0 words from the FIFO each time. Signed-off-by: Icenowy Zheng Message-id: 20220520124200.2112699-1-uwu@icenowy.me Reviewed-by: Peter Maydell Signed-off-by: Peter Maydell --- hw/sd/allwinner-sdhost.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/hw/sd/allwinner-sdhost.c b/hw/sd/allwinner-sdhost.c index 041e45c6804..455d6eabf64 100644 --- a/hw/sd/allwinner-sdhost.c +++ b/hw/sd/allwinner-sdhost.c @@ -114,7 +114,9 @@ enum { }; =20 enum { + SD_STAR_FIFO_EMPTY =3D (1 << 2), SD_STAR_CARD_PRESENT =3D (1 << 8), + SD_STAR_FIFO_LEVEL_1 =3D (1 << 17), }; =20 enum { @@ -467,6 +469,11 @@ static uint64_t allwinner_sdhost_read(void *opaque, hw= addr offset, break; case REG_SD_STAR: /* Status */ res =3D s->status; + if (sdbus_data_ready(&s->sdbus)) { + res |=3D SD_STAR_FIFO_LEVEL_1; + } else { + res |=3D SD_STAR_FIFO_EMPTY; + } break; case REG_SD_FWLR: /* FIFO Water Level */ res =3D s->fifo_wlevel; --=20 2.25.1