Patch "drm/bridge/synopsys: dsi: add support for non-continuous HS clock" has been added to the 5.9-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    drm/bridge/synopsys: dsi: add support for non-continuous HS clock

to the 5.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-bridge-synopsys-dsi-add-support-for-non-continuo.patch
and it can be found in the queue-5.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit de5e20121d4dc8e3fcd3c892d2c8b3fc38687102
Author: Antonio Borneo <antonio.borneo@xxxxxx>
Date:   Wed Jul 1 21:42:34 2020 +0200

    drm/bridge/synopsys: dsi: add support for non-continuous HS clock
    
    [ Upstream commit c6d94e37bdbb6dfe7e581e937a915ab58399b8a5 ]
    
    Current code enables the HS clock when video mode is started or to
    send out a HS command, and disables the HS clock to send out a LP
    command. This is not what DSI spec specify.
    
    Enable HS clock either in command and in video mode.
    Set automatic HS clock management for panels and devices that
    support non-continuous HS clock.
    
    Signed-off-by: Antonio Borneo <antonio.borneo@xxxxxx>
    Tested-by: Philippe Cornu <philippe.cornu@xxxxxx>
    Reviewed-by: Philippe Cornu <philippe.cornu@xxxxxx>
    Acked-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
    Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>
    Link: https://patchwork.freedesktop.org/patch/msgid/20200701194234.18123-1-yannick.fertre@xxxxxx
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
index d580b2aa4ce98..979acaa90d002 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
@@ -365,7 +365,6 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
 	if (lpm)
 		val |= CMD_MODE_ALL_LP;
 
-	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
 	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
 }
 
@@ -541,16 +540,22 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
 static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
 				 unsigned long mode_flags)
 {
+	u32 val;
+
 	dsi_write(dsi, DSI_PWR_UP, RESET);
 
 	if (mode_flags & MIPI_DSI_MODE_VIDEO) {
 		dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
 		dw_mipi_dsi_video_mode_config(dsi);
-		dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
 	} else {
 		dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
 	}
 
+	val = PHY_TXREQUESTCLKHS;
+	if (dsi->mode_flags & MIPI_DSI_CLOCK_NON_CONTINUOUS)
+		val |= AUTO_CLKLANE_CTRL;
+	dsi_write(dsi, DSI_LPCLK_CTRL, val);
+
 	dsi_write(dsi, DSI_PWR_UP, POWERUP);
 }