From: Jessica Zhang Date: Tue, 27 Jun 2023 20:31:45 +0000 (-0700) Subject: drm/msm/dsi: Enable BURST_MODE for command mode for DSI 6G v1.3+ X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=b173a7dcc2d06ee11f739c1bdcd51ee156b6d50c;p=linux.git 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 Reviewed-by: Dmitry Baryshkov 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 --- diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 3f6dfb4f9d5a6..6459272148711 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,