linux-kernel - [PATCH] drm/bridge/synopsys: dsi: allows LP commands in video mode

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Message-ID: <20200701145258.2782-1-yannick.fertre@st.com>
Date:   Wed, 1 Jul 2020 16:52:58 +0200
From:   Yannick Fertre <yannick.fertre@...com>
To:     Yannick Fertre <yannick.fertre@...com>,
        Philippe Cornu <philippe.cornu@...com>,
        Benjamin Gaignard <benjamin.gaignard@...com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] drm/bridge/synopsys: dsi: allows LP commands in video mode

From: Antonio Borneo <antonio.borneo@...com>

Current code only sends LP commands in command mode.

Allows sending LP commands also in video mode by setting the
proper flag in DSI_VID_MODE_CFG.

Signed-off-by: Antonio Borneo <antonio.borneo@...com>
Change-Id: Ib78fa37bcc7559ce63017acd6ee0bbf00c61a397
Reviewed-on: https://gerrit.st.com/c/mpu/oe/st/linux-stm32/+/153242
Reviewed-by: CITOOLS <smet-aci-reviews@...ts.codex.cro.st.com>
Reviewed-by: CIBUILD <smet-aci-builds@...ts.codex.cro.st.com>
Reviewed-by: Yannick FERTRE <yannick.fertre@...com>
Reviewed-by: Philippe CORNU <philippe.cornu@...com>
Tested-by: Yannick FERTRE <yannick.fertre@...com>
---
 drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index d580b2aa4ce9..0cd43e7a69bb 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -367,6 +367,13 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
 
 	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
 	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
+
+	val = dsi_read(dsi, DSI_VID_MODE_CFG);
+	if (lpm)
+		val |= ENABLE_LOW_POWER_CMD;
+	else
+		val &= ~ENABLE_LOW_POWER_CMD;
+	dsi_write(dsi, DSI_VID_MODE_CFG, val);
 }
 
 static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
-- 
2.17.1