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Mon, 20 Jan 2020 14:47:05 +0100 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C7356100034; Mon, 20 Jan 2020 14:47:00 +0100 (CET) Received: from Webmail-eu.st.com (sfhdag6node3.st.com [10.75.127.18]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 916642BF9A8; Mon, 20 Jan 2020 14:47:00 +0100 (CET) Received: from localhost (10.75.127.47) by SFHDAG6NODE3.st.com (10.75.127.18) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 20 Jan 2020 14:47:00 +0100 From: Yannick Fertre To: Yannick Fertre , Philippe Cornu , Benjamin Gaignard , David Airlie , Daniel Vetter , Maxime Coquelin , Alexandre Torgue , , , , Subject: [PATCH] drm/stm: ltdc: enable/disable depends on encoder Date: Mon, 20 Jan 2020 14:46:53 +0100 Message-ID: <1579528013-28445-1-git-send-email-yannick.fertre@st.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.75.127.47] X-ClientProxiedBy: SFHDAG3NODE3.st.com (10.75.127.9) To SFHDAG6NODE3.st.com (10.75.127.18) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138, 18.0.572 definitions=2020-01-20_02:2020-01-20, 2020-01-20 signatures=0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200120_054713_179580_DB1B7EB3 X-CRM114-Status: GOOD ( 12.63 ) X-Spam-Score: -0.9 (/) X-Spam-Report: SpamAssassin version 3.4.3 on bombadil.infradead.org summary: Content analysis details: (-0.9 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at https://www.dnswl.org/, low trust [91.207.212.93 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Yannick Fertré When connected to a dsi host, the ltdc display controller must send frames only after the end of the dsi panel initialization to avoid errors when the dsi host sends commands to the dsi panel (dsi px fifo full). To avoid this issue, the display controller must be enabled/disabled when the encoder is enabled/disabled. Signed-off-by: Yannick Fertré Acked-by: Philippe Cornu --- drivers/gpu/drm/stm/ltdc.c | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c index 719dfc5..9ef125d 100644 --- a/drivers/gpu/drm/stm/ltdc.c +++ b/drivers/gpu/drm/stm/ltdc.c @@ -437,9 +437,6 @@ static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc, /* Commit shadow registers = update planes at next vblank */ reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR); - /* Enable LTDC */ - reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN); - drm_crtc_vblank_on(crtc); } @@ -453,9 +450,6 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc, drm_crtc_vblank_off(crtc); - /* disable LTDC */ - reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN); - /* disable IRQ */ reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE); @@ -1058,9 +1052,13 @@ static const struct drm_encoder_funcs ltdc_encoder_funcs = { static void ltdc_encoder_disable(struct drm_encoder *encoder) { struct drm_device *ddev = encoder->dev; + struct ltdc_device *ldev = ddev->dev_private; DRM_DEBUG_DRIVER("\n"); + /* Disable LTDC */ + reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN); + /* Set to sleep state the pinctrl whatever type of encoder */ pinctrl_pm_select_sleep_state(ddev->dev); } @@ -1068,6 +1066,7 @@ static void ltdc_encoder_disable(struct drm_encoder *encoder) static void ltdc_encoder_enable(struct drm_encoder *encoder) { struct drm_device *ddev = encoder->dev; + struct ltdc_device *ldev = ddev->dev_private; DRM_DEBUG_DRIVER("\n"); @@ -1078,6 +1077,9 @@ static void ltdc_encoder_enable(struct drm_encoder *encoder) */ if (encoder->encoder_type == DRM_MODE_ENCODER_DPI) pinctrl_pm_select_default_state(ddev->dev); + + /* Enable LTDC */ + reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN); } static const struct drm_encoder_helper_funcs ltdc_encoder_helper_funcs = {