From patchwork Mon Jun 17 21:48:12 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Ciocaltea X-Patchwork-Id: 13701466 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 C407CC2BA1A for ; Mon, 17 Jun 2024 21:57:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=aADGgisAT2+BTbJeqIxaq+vVrVgMXM4oJCZ/Zje6TEI=; b=BzR49Lt+/S1CBKzstC4TEzjnVd GKo7wysXQtBfCr37llwLh1ChuTQ5A+ihwpqebPM9LUVosOaFbzaMKekwrBmn75A+ssgquBTsnda9j IkbnXnohQmAH0d10iaM+4o2Q8M4Sk7Puv80vPdd1mXu2ejWBXUM1WcMN3vzbOMD7c0i1TOR98BgyL pw4yHBjSfS6RxuloE0K/NRqr3AkhbjyuDWv9Lj232T5CZknWdeY0w8jMylGfSMkbabQydBDBy6mo6 727A/Q6nU+ko1ypUdIVy2Zw8jAYxfWGt3dNQBhuxJr78cq2DKCG4EkxEJ93y7prVhkGLsqFM+0CEb Bn5VBmmg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJKLP-0000000CjoA-0hGR; Mon, 17 Jun 2024 21:56:55 +0000 Received: from madrid.collaboradmins.com ([2a00:1098:ed:100::25]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sJKKz-0000000CjXH-3Ny4; Mon, 17 Jun 2024 21:56:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=collabora.com; s=mail; t=1718661388; bh=PJqnn1xMk/vyTcI7+A/mSlNl/s10hJkFyTUCDiHLlLQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=EoeSEaXHD95nl/EmSAh75MlfIbNTFm82Mb1sQmIwwLYLI4KBbYwt1Lpd0GvJ3omZ+ czgo+iO1EDSLl3wEYGVlkrvzwP4pHW4YPlgIvc3SBHVJ+7SMTvTsVO4bfS0kIfBrjy /eHVDWyHTB2/6wtHQUrH5CFedrSe8vog/CotNbGkg4UUH28nDenoh+n9gnw4wHjd7M 3u/FP+++Iqs+WQfQICWyMYvjDRAoX7i0B8CcQ+oWOAua7QQ0NVCa2hQ5pbu9FG3FVt Ynbcm+t2lxP8EatqDlcT0sb9l+DoKOBYTyFBGQC1vm9efLFde+BqI6pt2r0B62iq2o KBBc7inHUqzLw== Received: from localhost (cola.collaboradmins.com [195.201.22.229]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (prime256v1) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) (Authenticated sender: cristicc) by madrid.collaboradmins.com (Postfix) with ESMTPSA id 5A56D378217B; Mon, 17 Jun 2024 21:56:28 +0000 (UTC) From: Cristian Ciocaltea Date: Tue, 18 Jun 2024 00:48:12 +0300 Subject: [PATCH 4/4] phy: phy-rockchip-samsung-hdptx: Add clock provider support MIME-Version: 1.0 Message-Id: <20240618-rk3588-hdmiphy-clkprov-v1-4-80e4aa12177e@collabora.com> References: <20240618-rk3588-hdmiphy-clkprov-v1-0-80e4aa12177e@collabora.com> In-Reply-To: <20240618-rk3588-hdmiphy-clkprov-v1-0-80e4aa12177e@collabora.com> To: Vinod Koul , Kishon Vijay Abraham I , Heiko Stuebner , Algea Cao , Rob Herring , Krzysztof Kozlowski , Conor Dooley Cc: kernel@collabora.com, linux-phy@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org X-Mailer: b4 0.14-dev-f7c49 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240617_145630_060458_36020DEA X-CRM114-Status: GOOD ( 22.33 ) 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 The HDMI PHY PLL can be used as an alternative dclk source to RK3588 SoC CRU. It provides more accurate clock rates required by VOP2 to improve existing support for display modes handling, which is known to be problematic when dealing with non-integer refresh rates, among others. It is worth noting this only works for HDMI 2.0 or below, e.g. cannot be used to support HDMI 2.1 4K@120Hz mode. Signed-off-by: Cristian Ciocaltea --- drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c | 189 +++++++++++++++++++--- 1 file changed, 167 insertions(+), 22 deletions(-) diff --git a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c index 72de287282eb..ad3fd4084377 100644 --- a/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c +++ b/drivers/phy/rockchip/phy-rockchip-samsung-hdptx.c @@ -8,6 +8,7 @@ */ #include #include +#include #include #include #include @@ -191,6 +192,8 @@ #define LN3_TX_SER_RATE_SEL_HBR2 BIT(3) #define LN3_TX_SER_RATE_SEL_HBR3 BIT(2) +#define HDMI20_MAX_RATE 600000000 + struct lcpll_config { u32 bit_rate; u8 lcvco_mode_en; @@ -273,6 +276,12 @@ struct rk_hdptx_phy { struct clk_bulk_data *clks; int nr_clks; struct reset_control_bulk_data rsts[RST_MAX]; + + /* clk provider */ + struct clk_hw hw; + unsigned long rate; + + atomic_t usage_count; }; static const struct ropll_config ropll_tmds_cfg[] = { @@ -760,6 +769,8 @@ static int rk_hdptx_ropll_tmds_cmn_config(struct rk_hdptx_phy *hdptx, struct ropll_config rc = {0}; int i; + hdptx->rate = rate * 100; + for (i = 0; i < ARRAY_SIZE(ropll_tmds_cfg); i++) if (rate == ropll_tmds_cfg[i].bit_rate) { cfg = &ropll_tmds_cfg[i]; @@ -823,19 +834,6 @@ static int rk_hdptx_ropll_tmds_cmn_config(struct rk_hdptx_phy *hdptx, static int rk_hdptx_ropll_tmds_mode_config(struct rk_hdptx_phy *hdptx, unsigned int rate) { - u32 val; - int ret; - - ret = regmap_read(hdptx->grf, GRF_HDPTX_STATUS, &val); - if (ret) - return ret; - - if (!(val & HDPTX_O_PLL_LOCK_DONE)) { - ret = rk_hdptx_ropll_tmds_cmn_config(hdptx, rate); - if (ret) - return ret; - } - rk_hdptx_multi_reg_write(hdptx, rk_hdtpx_common_sb_init_seq); regmap_write(hdptx->regmap, LNTOP_REG(0200), 0x06); @@ -857,10 +855,66 @@ static int rk_hdptx_ropll_tmds_mode_config(struct rk_hdptx_phy *hdptx, return rk_hdptx_post_enable_lane(hdptx); } +static int rk_hdptx_phy_consumer_get(struct rk_hdptx_phy *hdptx, + unsigned int rate) +{ + u32 status; + int ret; + + if (atomic_inc_return(&hdptx->usage_count) > 1) + return 0; + + ret = regmap_read(hdptx->grf, GRF_HDPTX_STATUS, &status); + if (ret) + goto dec_usage; + + if (status & HDPTX_O_PLL_LOCK_DONE) + dev_warn(hdptx->dev, "PLL locked by unknown consumer!\n"); + + if (rate) { + ret = rk_hdptx_ropll_tmds_cmn_config(hdptx, rate); + if (ret) + goto dec_usage; + } + + return 0; + +dec_usage: + atomic_dec(&hdptx->usage_count); + return ret; +} + +static int rk_hdptx_phy_consumer_put(struct rk_hdptx_phy *hdptx) +{ + u32 status; + int ret; + + ret = atomic_dec_return(&hdptx->usage_count); + if (ret > 0) + return 0; + + if (ret < 0) { + dev_warn(hdptx->dev, "Usage count underflow!\n"); + ret = -EINVAL; + } else { + ret = regmap_read(hdptx->grf, GRF_HDPTX_STATUS, &status); + if (!ret) { + if (status & HDPTX_O_PLL_LOCK_DONE) + rk_hdptx_phy_disable(hdptx); + return 0; + } + } + + atomic_inc(&hdptx->usage_count); + return ret; +} + static int rk_hdptx_phy_power_on(struct phy *phy) { struct rk_hdptx_phy *hdptx = phy_get_drvdata(phy); int bus_width = phy_get_bus_width(hdptx->phy); + int ret; + /* * FIXME: Temporary workaround to pass pixel_clk_rate * from the HDMI bridge driver until phy_configure_opts_hdmi @@ -871,20 +925,18 @@ static int rk_hdptx_phy_power_on(struct phy *phy) dev_dbg(hdptx->dev, "%s bus_width=%x rate=%u\n", __func__, bus_width, rate); - return rk_hdptx_ropll_tmds_mode_config(hdptx, rate); + ret = rk_hdptx_phy_consumer_get(hdptx, rate); + if (!ret) + ret = rk_hdptx_ropll_tmds_mode_config(hdptx, rate); + + return ret; } static int rk_hdptx_phy_power_off(struct phy *phy) { struct rk_hdptx_phy *hdptx = phy_get_drvdata(phy); - u32 val; - int ret; - - ret = regmap_read(hdptx->grf, GRF_HDPTX_STATUS, &val); - if (ret == 0 && (val & HDPTX_O_PLL_LOCK_DONE)) - rk_hdptx_phy_disable(hdptx); - return ret; + return rk_hdptx_phy_consumer_put(hdptx); } static const struct phy_ops rk_hdptx_phy_ops = { @@ -893,6 +945,99 @@ static const struct phy_ops rk_hdptx_phy_ops = { .owner = THIS_MODULE, }; +static struct rk_hdptx_phy *to_rk_hdptx_phy(struct clk_hw *hw) +{ + return container_of(hw, struct rk_hdptx_phy, hw); +} + +static int rk_hdptx_phy_clk_prepare(struct clk_hw *hw) +{ + struct rk_hdptx_phy *hdptx = to_rk_hdptx_phy(hw); + + return rk_hdptx_phy_consumer_get(hdptx, hdptx->rate / 100); +} + +static void rk_hdptx_phy_clk_unprepare(struct clk_hw *hw) +{ + struct rk_hdptx_phy *hdptx = to_rk_hdptx_phy(hw); + + rk_hdptx_phy_consumer_put(hdptx); +} + +static unsigned long rk_hdptx_phy_clk_recalc_rate(struct clk_hw *hw, + unsigned long parent_rate) +{ + struct rk_hdptx_phy *hdptx = to_rk_hdptx_phy(hw); + + return hdptx->rate; +} + +static long rk_hdptx_phy_clk_round_rate(struct clk_hw *hw, unsigned long rate, + unsigned long *parent_rate) +{ + u32 bit_rate = rate / 100; + int i; + + if (rate > HDMI20_MAX_RATE) + return rate; + + for (i = 0; i < ARRAY_SIZE(ropll_tmds_cfg); i++) + if (bit_rate == ropll_tmds_cfg[i].bit_rate) + break; + + if (i == ARRAY_SIZE(ropll_tmds_cfg) && + !rk_hdptx_phy_clk_pll_calc(bit_rate, NULL)) + return -EINVAL; + + return rate; +} + +static int rk_hdptx_phy_clk_set_rate(struct clk_hw *hw, unsigned long rate, + unsigned long parent_rate) +{ + struct rk_hdptx_phy *hdptx = to_rk_hdptx_phy(hw); + + return rk_hdptx_ropll_tmds_cmn_config(hdptx, rate / 100); +} + +static const struct clk_ops hdptx_phy_clk_ops = { + .prepare = rk_hdptx_phy_clk_prepare, + .unprepare = rk_hdptx_phy_clk_unprepare, + .recalc_rate = rk_hdptx_phy_clk_recalc_rate, + .round_rate = rk_hdptx_phy_clk_round_rate, + .set_rate = rk_hdptx_phy_clk_set_rate, +}; + +static int rk_hdptx_phy_clk_register(struct rk_hdptx_phy *hdptx) +{ + struct device *dev = hdptx->dev; + const char *name, *pname; + struct clk *refclk; + int ret, id; + + refclk = devm_clk_get(dev, "ref"); + if (IS_ERR(refclk)) + return dev_err_probe(dev, PTR_ERR(refclk), + "Failed to get ref clock\n"); + + id = of_alias_get_id(dev->of_node, "hdptxphy"); + name = id > 0 ? "clk_hdmiphy_pixel1" : "clk_hdmiphy_pixel0"; + pname = __clk_get_name(refclk); + + hdptx->hw.init = CLK_HW_INIT(name, pname, &hdptx_phy_clk_ops, + CLK_GET_RATE_NOCACHE); + + ret = devm_clk_hw_register(dev, &hdptx->hw); + if (ret) + return dev_err_probe(dev, ret, "Failed to register clock\n"); + + ret = devm_of_clk_add_hw_provider(dev, of_clk_hw_simple_get, &hdptx->hw); + if (ret) + return dev_err_probe(dev, ret, + "Failed to register clk provider\n"); + return 0; +} + static int rk_hdptx_phy_runtime_suspend(struct device *dev) { struct rk_hdptx_phy *hdptx = dev_get_drvdata(dev); @@ -987,7 +1132,7 @@ static int rk_hdptx_phy_probe(struct platform_device *pdev) reset_control_deassert(hdptx->rsts[RST_CMN].rstc); reset_control_deassert(hdptx->rsts[RST_INIT].rstc); - return 0; + return rk_hdptx_phy_clk_register(hdptx); } static const struct dev_pm_ops rk_hdptx_phy_pm_ops = {