From patchwork Tue Aug 1 11:58:45 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: 13336592 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (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 4A93FC00528 for ; Tue, 1 Aug 2023 11:59:22 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BF28610E3EA; Tue, 1 Aug 2023 11:59:08 +0000 (UTC) Received: from madras.collabora.co.uk (madras.collabora.co.uk [IPv6:2a00:1098:0:82:1000:25:2eeb:e5ab]) by gabe.freedesktop.org (Postfix) with ESMTPS id B582510E3E6 for ; Tue, 1 Aug 2023 11:59:05 +0000 (UTC) Received: from IcarusMOD.eternityproject.eu (2-237-20-237.ip236.fastwebnet.it [2.237.20.237]) (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 C720A660718C; Tue, 1 Aug 2023 12:59:03 +0100 (BST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1690891144; bh=300Y5h80g46COpGlx0H6hu4Nbeunl/5bqJFtVyc6tvo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZFsIaeGOaGgR2WFlvXKzdjA8WLoqx2wu+PFLk+pSwwz7GEvhUY6GqkYhrAQ43a+Gr UxW6OP9qgDGqgo8jgHZt9PQjvEtm3s3InMzSyD7PGmsnny5L0/pemcOjJHnpqFOGLL lPSWTgFs0/8VUQgoljCU52jxqFHSSizfhbL8FBf9IJhvwyO32CTO+g6B5/DsevXdRL +SLPGlfOUpP4qp97K0B72LBNma2myhViGKf4IHNAM79HdRhirifBZi3SC58W4jsrRn O4ZPx0owPi1leyS9K4/Xv1kRLjI8p6TkoNMP6EMPWUB/cML4qN2WKNk+zSp/JRsnrL Qw3bXRvvKmeTw== From: AngeloGioacchino Del Regno To: chunkuang.hu@kernel.org Subject: [PATCH v8 04/13] drm/mediatek: gamma: Improve and simplify HW LUT calculation Date: Tue, 1 Aug 2023 13:58:45 +0200 Message-ID: <20230801115854.150346-5-angelogioacchino.delregno@collabora.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230801115854.150346-1-angelogioacchino.delregno@collabora.com> References: <20230801115854.150346-1-angelogioacchino.delregno@collabora.com> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Alexandre Mergnat , "Jason-JH . Lin" , linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-mediatek@lists.infradead.org, ehristev@collabora.com, wenst@chromium.org, matthias.bgg@gmail.com, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, angelogioacchino.delregno@collabora.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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 Reviewed-by: Alexandre Mergnat --- 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 bfdecb278b45..1e21dd92c88b 100644 --- a/drivers/gpu/drm/mediatek/mtk_disp_gamma.c +++ b/drivers/gpu/drm/mediatek/mtk_disp_gamma.c @@ -71,7 +71,6 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, void __iomem *lut_base; bool lut_diff; u32 word; - u32 diff[3] = {0}; /* If there's no gamma lut there's nothing to do here. */ if (!state->gamma_lut) @@ -91,18 +90,29 @@ void mtk_gamma_set_common(struct device *dev, void __iomem *regs, 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)); }