From patchwork Thu Jun 1 12:10:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AngeloGioacchino Del Regno X-Patchwork-Id: 13263666 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 76DF9C7EE31 for ; Thu, 1 Jun 2023 12:30:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=AH6bsTt8dMbor5bizsfNKBUfqKA+sBlpV3sp4kA6gWg=; b=o9X39pZ7Ry1faa /WUBw4ndfKgsexpQm6GC8sCVHsgXv5O6ZEKz3xJtKYFdHpdT/dJYjcVL7K2tv/IXK+04XlNk7AAtR 9Kn7UttUZPG8oV12EeK3lfh1RFkyZEflt850VVmx1YnXZkWolphTFo9nnfjpRTrWeBL6kWqt4qf3u g9HkzwapCstiAA13qf85GSupElZdv++Jb3gxCYwe845GXurUGRCqm3MQSPRPu56z5JHFWbRqMwcu/ Wtb7TcyAv52QRAVbjsKCxunqX2mgj8/5Dba4mfNPHAQhf7z1bKZVpq579FRYR5mDWWs6wqiPFNkhf R8Ze18PKICqPY/C1PfiQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q4hRS-003WzJ-2q; Thu, 01 Jun 2023 12:30:10 +0000 Received: from madras.collabora.co.uk ([2a00:1098:0:82:1000:25:2eeb:e5ab]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q4h8S-003O2I-0x; Thu, 01 Jun 2023 12:10:33 +0000 Received: from IcarusMOD.eternityproject.eu (unknown [IPv6:2001:b07:2ed:14ed:a962:cd4d:a84:1eab]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: kholk11) by madras.collabora.co.uk (Postfix) with ESMTPSA id 4A3116606EC6; Thu, 1 Jun 2023 13:10:30 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1685621431; bh=JI4lc9a8QXR5NBTwDSozQ6dg2sDhEor4ZM5gg2fngeU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OkF7uol3xtv6g3BnVV1WKL9QfZWHq4DDRAOwg5aIm1B4M8lEFjLjodUu6yymWYrvt 9m0nYMi5JXYwu+t0y91igKmR3ccdmeoqDpP8DnYQJJMmpxuumWgR3Vz1TZrt/3pPqn kHTvEK1hCXzuN5AG6mHkK3IW5G+NYM49E6h4f1fRD1+rjFC3HXANNH76idBD8vns6V ItVXXGQrU9yMKXqeM7zzY7KGPEIHu1RQZw8sLGfU8aPqv1VVJDrZJZKQnKkx48Hg30 uJV++uX5NXAPgB3hVmAW1eXnSCBAEFJKMXTas2Z753gyIleg+LXG0WTkqkmchsk10b k2ExlGGXhwngQ== From: AngeloGioacchino Del Regno To: chunkuang.hu@kernel.org Cc: p.zabel@pengutronix.de, airlied@gmail.com, daniel@ffwll.ch, matthias.bgg@gmail.com, angelogioacchino.delregno@collabora.com, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, wenst@chromium.org, kernel@collabora.com, "Jason-JH . Lin" Subject: [PATCH v5 04/11] drm/mediatek: gamma: Improve and simplify HW LUT calculation Date: Thu, 1 Jun 2023 14:10:15 +0200 Message-Id: <20230601121022.2401844-5-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230601121022.2401844-1-angelogioacchino.delregno@collabora.com> References: <20230601121022.2401844-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230601_051032_481618_C5AA1B46 X-CRM114-Status: GOOD ( 11.84 ) 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 Use drm_color_lut_extract() to avoid open-coding the bits reduction calculations for each color channel and use a struct drm_color_lut to temporarily store the information instead of an array of u32. Also, slightly improve the precision of the HW LUT calculation in the LUT DIFF case by performing the subtractions on the 16-bits values and doing the 10 bits conversion later. Signed-off-by: AngeloGioacchino Del Regno Reviewed-by: Jason-JH.Lin --- drivers/gpu/drm/mediatek/mtk_disp_gamma.c | 30 +++++++++++++++-------- 1 file changed, 20 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c index b25ba209e7a4..204a1aa7bfc9 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c @@ -77,7 +77,6 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt bool lut_diff; u16 lut_size; u32 word; - u32 diff[3] = {0}; /* If there's no gamma lut there's nothing to do here. */ if (!state->gamma_lut) @@ -97,18 +96,29 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, struct drm_crt lut_base = regs + DISP_GAMMA_LUT; lut = (struct drm_color_lut *)state->gamma_lut->data; for (i = 0; i < lut_size; i++) { + struct drm_color_lut diff, hwlut; + + hwlut.red = drm_color_lut_extract(lut[i].red, 10); + hwlut.green = drm_color_lut_extract(lut[i].green, 10); + hwlut.blue = drm_color_lut_extract(lut[i].blue, 10); + if (!lut_diff || (i % 2 == 0)) { - word = (((lut[i].red >> 6) & LUT_10BIT_MASK) << 20) + - (((lut[i].green >> 6) & LUT_10BIT_MASK) << 10) + - ((lut[i].blue >> 6) & LUT_10BIT_MASK); + word = hwlut.red << 20 + + hwlut.green << 10 + + hwlut.red; } else { - diff[0] = (lut[i].red >> 6) - (lut[i - 1].red >> 6); - diff[1] = (lut[i].green >> 6) - (lut[i - 1].green >> 6); - diff[2] = (lut[i].blue >> 6) - (lut[i - 1].blue >> 6); + diff.red = lut[i].red - lut[i - 1].red; + diff.red = drm_color_lut_extract(diff.red, 10); + + diff.green = lut[i].green - lut[i - 1].green; + diff.green = drm_color_lut_extract(diff.green, 10); + + diff.blue = lut[i].blue - lut[i - 1].blue; + diff.blue = drm_color_lut_extract(diff.blue, 10); - word = ((diff[0] & LUT_10BIT_MASK) << 20) + - ((diff[1] & LUT_10BIT_MASK) << 10) + - (diff[2] & LUT_10BIT_MASK); + word = diff.blue << 20 + + diff.green << 10 + + diff.red; } writel(word, (lut_base + i * 4)); }