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Tue, 1 Sep 2020 04:08:50 +0000 (GMT) From: Hoegeun Kwon To: nsaenzjulienne@suse.de, eric@anholt.net, maxime@cerno.tech, stefan.wahren@i2se.com, dave.stevenson@raspberrypi.com Cc: devicetree@vger.kernel.org, tim.gover@raspberrypi.com, sboyd@kernel.org, mturquette@baylibre.com, kdasu.kdev@gmail.com, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-clk@vger.kernel.org, robh+dt@kernel.org, bcm-kernel-feedback-list@broadcom.com, linux-rpi-kernel@lists.infradead.org, phil@raspberrypi.com, linux-arm-kernel@lists.infradead.org, hoegeun.kwon@samsung.com Subject: [PATCH v2 2/4] drm/vc4: hdmi: Add pixel bvb clock control Date: Tue, 1 Sep 2020 13:07:57 +0900 Message-Id: <20200901040759.29992-3-hoegeun.kwon@samsung.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200901040759.29992-1-hoegeun.kwon@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFtrLJsWRmVeSWpSXmKPExsWy7bCmvm7wSd94g3lz1CzW9h5lsXg7dzGL xfwj51gtrnx9z2ZxoPEyo8X75V1sFjuvrGWx2PT4GqvFx557rBaXd81hs5h4ewO7xYwf/xgt Lp5ytdg2azmbxbpbr9ksWvceYbf4d20jUMOKG2wWj6beZ3QQ9mh6f4zN4/2NVnaPWffPsnnc OXeezWPnrLvsHltvmXpsWtXJ5nG/+ziTx+Yl9R6tR3+xePRtWcXosfl0tcfnTXIBvFHZNhmp iSmpRQqpecn5KZl56bZK3sHxzvGmZgaGuoaWFuZKCnmJuam2Si4+AbpumTlAbyoplCXmlAKF AhKLi5X07WyK8ktLUhUy8otLbJVSC1JyCiwL9IoTc4tL89L1kvNzrQwNDIxMgQoTsjP+fVrN VLBFtOL4jE7WBsZuoS5GTg4JAROJgy/2sXUxcnEICexglPjQ/4MdwvnEKLH02QeozDdGiWPf pgE5HGAtO0/UQcT3MkpcmH6AFcL5zCgx5/55NpC5bAK6El97rjOB2CICFRL7nl9nBCliFpjK LPF0zjKwhLCAk8TOLa0sIDaLgKrEokP/GUFsXgFbiWdTO5ggDpSXWL3hADOIzSlgJ3F9yVsW kEESAlc4JLb/PM8McZKLxNOTXBD1whKvjm9hh7ClJF72t0HZxRJXZr6C6m1glOifOBsqYSyx f+lkJpA5zAKaEut36UOEFSV2/p4Ldg+zAJ/Eu689rBCreCU62qBhpybxrAHkeRBbRuJU73Ko kz0kbr47xwwJlImMEo8XX2WewCg3C2HDAkbGVYxiqQXFuempxYYFxshRtokRnI61zHcwTnv7 Qe8QIxMH4yFGCQ5mJRHeA7u844V4UxIrq1KL8uOLSnNSiw8xmgIDbyKzlGhyPjAj5JXEG5oa GRsbW5gYmpkaGiqJ8z68pRAvJJCeWJKanZpakFoE08fEwSnVwJSXKPhw9+nkmm7PlK/zD5Yf vcNR735Z5kR6wNdLsWJRLz0PFax7rOsqm5WnVSH5P9/txL2zoqdNvZufbFJwsbu71SxuxpWM irdtZ2X6UnT3Kux/vitgQVggQ/yjQCadPZUp+9x+LajPWPnxcdHq2xrCLDO3J13kMzGbtyFD dHrNkhnd8z0W6gX+XymioH8o/OvTs0u1kvJbmT/N7HQUeXg4iqF3jcyDVo4LGxb4M1/osNr6 TLrHaIe2/gIvPnf2JasVRV0WPftssvAAo4Jb6sZtnK5R73IaizqXi3330FZ/avvMfOnsTytS nQ5MvvpSWC/hUPS5L33yfTtDVC9vdM5/t2Otp+5lXvG3lwKeciixFGckGmoxFxUnAgDyAImL UAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFvrKLMWRmVeSWpSXmKPExsWy7bCSnG7wSd94g6d9HBZre4+yWLydu5jF Yv6Rc6wWV76+Z7M40HiZ0eL98i42i51X1rJYbHp8jdXiY889VovLu+awWUy8vYHdYsaPf4wW F0+5WmybtZzNYt2t12wWrXuPsFv8u7YRqGHFDTaLR1PvMzoIezS9P8bm8f5GK7vHrPtn2Tzu nDvP5rFz1l12j623TD02repk87jffZzJY/OSeo/Wo79YPPq2rGL02Hy62uPzJrkA3igum5TU nMyy1CJ9uwSujH+fVjMVbBGtOD6jk7WBsVuoi5GDQ0LARGLnibouRi4OIYHdjBIPp31h6WLk BIrLSKzq38IKUSMscfhwMUTNR0aJnb/PMYLUsAnoSnztuc4EYosI1Ek86WgE62UWWMos0TJJ AcQWFnCS2LmlFSzOIqAqsejQf7BeXgFbiWdTO5ggdslLrN5wgBnE5hSwk7i+5C1YvRBQzfE3 G9gmMPItYGRYxSiZWlCcm55bbFhgmJdarlecmFtcmpeul5yfu4kRHDNamjsYt6/6oHeIkYmD 8RCjBAezkgjvgV3e8UK8KYmVValF+fFFpTmpxYcYpTlYlMR5bxQujBMSSE8sSc1OTS1ILYLJ MnFwSjUwuYs5+qStMyot2FV2r/mZUueJnrfXWq+YuwZY9zYz5FyI0TV9WanTtH9jHvfS2Z/f sL0KjNC9/3rllQkb+/cXRZVuMzd+vNzDa6epmfJRCZfNMwW6GDcs6dsZnPPyy8M/q+pjua8a FoWZTVFseRfLrJQ696uHgemU2nml+TtYNm1dUG5v5c/qufrFGRNVmT2lksdeFXufZP925Zjz iRUKvAk/0jY/tlkZk7H+HX+0u77DmVv85068lX5+O/nyO9+VpU8CziqV7d6b/+lQzZ6sP7O+ tt64PmXpx5pgK5a1xlm7Zx2Ue3DActn+gONOW9+zVzwv+7/axTg9zfVLUeAfvgr/F9EMAX3r H7Rq7z+3VomlOCPRUIu5qDgRAIXJgroIAwAA X-CMS-MailID: 20200901040851epcas1p3124094e38175758b2310bdae6d76793c X-Msg-Generator: CA X-Sendblock-Type: SVC_REQ_APPROVE CMS-TYPE: 101P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20200901040851epcas1p3124094e38175758b2310bdae6d76793c References: <20200901040759.29992-1-hoegeun.kwon@samsung.com> Sender: linux-clk-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-clk@vger.kernel.org There is a problem that the output does not work at a resolution exceeding FHD. To solve this, we need to adjust the bvb clock at a resolution exceeding FHD. Signed-off-by: Hoegeun Kwon --- drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++++++++++++++ drivers/gpu/drm/vc4/vc4_hdmi.h | 1 + 2 files changed, 26 insertions(+) diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c index 95ec5eedea39..eb3192d1fd86 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.c +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c @@ -80,6 +80,7 @@ # define VC4_HD_M_ENABLE BIT(0) #define CEC_CLOCK_FREQ 40000 +#define VC4_HSM_MID_CLOCK 149985000 static int vc4_hdmi_debugfs_regs(struct seq_file *m, void *unused) { @@ -380,6 +381,7 @@ static void vc4_hdmi_encoder_post_crtc_powerdown(struct drm_encoder *encoder) HDMI_WRITE(HDMI_VID_CTL, HDMI_READ(HDMI_VID_CTL) & ~VC4_HD_VID_CTL_ENABLE); + clk_disable_unprepare(vc4_hdmi->pixel_bvb_clock); clk_disable_unprepare(vc4_hdmi->hsm_clock); clk_disable_unprepare(vc4_hdmi->pixel_clock); @@ -638,6 +640,23 @@ static void vc4_hdmi_encoder_pre_crtc_configure(struct drm_encoder *encoder) return; } + ret = clk_set_rate(vc4_hdmi->pixel_bvb_clock, + (hsm_rate > VC4_HSM_MID_CLOCK ? 150000000 : 75000000)); + if (ret) { + DRM_ERROR("Failed to set pixel bvb clock rate: %d\n", ret); + clk_disable_unprepare(vc4_hdmi->hsm_clock); + clk_disable_unprepare(vc4_hdmi->pixel_clock); + return; + } + + ret = clk_prepare_enable(vc4_hdmi->pixel_bvb_clock); + if (ret) { + DRM_ERROR("Failed to turn on pixel bvb clock: %d\n", ret); + clk_disable_unprepare(vc4_hdmi->hsm_clock); + clk_disable_unprepare(vc4_hdmi->pixel_clock); + return; + } + if (vc4_hdmi->variant->reset) vc4_hdmi->variant->reset(vc4_hdmi); @@ -1593,6 +1612,12 @@ static int vc5_hdmi_init_resources(struct vc4_hdmi *vc4_hdmi) return PTR_ERR(vc4_hdmi->audio_clock); } + vc4_hdmi->pixel_bvb_clock = devm_clk_get(dev, "bvb"); + if (IS_ERR(vc4_hdmi->pixel_bvb_clock)) { + DRM_ERROR("Failed to get pixel bvb clock\n"); + return PTR_ERR(vc4_hdmi->pixel_bvb_clock); + } + vc4_hdmi->reset = devm_reset_control_get(dev, NULL); if (IS_ERR(vc4_hdmi->reset)) { DRM_ERROR("Failed to get HDMI reset line\n"); diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.h b/drivers/gpu/drm/vc4/vc4_hdmi.h index 0806c6d9f24e..63c6f8bddf1d 100644 --- a/drivers/gpu/drm/vc4/vc4_hdmi.h +++ b/drivers/gpu/drm/vc4/vc4_hdmi.h @@ -147,6 +147,7 @@ struct vc4_hdmi { struct clk *pixel_clock; struct clk *hsm_clock; struct clk *audio_clock; + struct clk *pixel_bvb_clock; struct reset_control *reset;