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drm/msm/dsi: Enable BURST_MODE for command mode for DSI 6G v1.3+

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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>
This commit is contained in:
Jessica Zhang 2023-06-27 13:31:45 -07:00 committed by Dmitry Baryshkov
parent cc9a79715a
commit b173a7dcc2
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/msm/dsi/dsi_host.c
View file

@ -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,