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| author | Jessica Zhang <quic_jesszhan@quicinc.com> | 2023-06-27 13:31:45 -0700 |
|---|---|---|
| committer | Dmitry Baryshkov <dmitry.baryshkov@linaro.org> | 2023-07-27 14:59:15 +0300 |
| commit | b173a7dcc2d06ee11f739c1bdcd51ee156b6d50c (patch) | |
| tree | 393891960eae20a07026296843f5fba3e9bc5145 /drivers/gpu/drm/msm/dsi | |
| parent | cc9a79715a5689822f2ee702414cc995af39a937 (diff) | |
| download | linux-stable-b173a7dcc2d06ee11f739c1bdcd51ee156b6d50c.tar.gz linux-stable-b173a7dcc2d06ee11f739c1bdcd51ee156b6d50c.tar.bz2 linux-stable-b173a7dcc2d06ee11f739c1bdcd51ee156b6d50c.zip | |
drm/msm/dsi: Enable BURST_MODE for command mode for DSI 6G v1.3+
During a frame transfer in command mode, there could be frequent
LP11 <-> HS transitions when multiple DCS commands are sent mid-frame or
if the DSI controller is running on slow clock and is throttled. To
minimize frame latency due to these transitions, it is recommended to
send the frame in a single burst.
This feature is supported for DSI 6G 1.3 and above, thus enable burst
mode if supported.
Signed-off-by: Jessica Zhang <quic_jesszhan@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/544551/
Link: https://lore.kernel.org/r/20230608-b4-add-burst-mode-v2-1-2ff468457d46@quicinc.com
[DB: fixed indentation]
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Diffstat (limited to 'drivers/gpu/drm/msm/dsi')
| -rw-r--r-- | drivers/gpu/drm/msm/dsi/dsi_host.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 3f6dfb4f9d5a..645927214871 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -752,6 +752,13 @@ static void dsi_ctrl_enable(struct msm_dsi_host *msm_host, /* Always insert DCS command */ data |= DSI_CMD_CFG1_INSERT_DCS_COMMAND; dsi_write(msm_host, REG_DSI_CMD_CFG1, data); + + if (msm_host->cfg_hnd->major == MSM_DSI_VER_MAJOR_6G && + msm_host->cfg_hnd->minor >= MSM_DSI_6G_VER_MINOR_V1_3) { + data = dsi_read(msm_host, REG_DSI_CMD_MODE_MDP_CTRL2); + data |= DSI_CMD_MODE_MDP_CTRL2_BURST_MODE; + dsi_write(msm_host, REG_DSI_CMD_MODE_MDP_CTRL2, data); + } } dsi_write(msm_host, REG_DSI_CMD_DMA_CTRL, |