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drm/msm: dsi: Provide option to force continuous HS clock

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Some DSI peripherals rely on the HS clock on DSI clock lane as their clock
source. If the clock lane transitions between HS and LP states, it
can disrupt the functioning of such peripherals.

The mipi dsi mode flag MIPI_DSI_CLOCK_NON_CONTINUOUS already exists for
such peripheral drivers. Use it to configure the bit CLKLN_HS_FORCE_REQUEST
in DSI_LANE_CTRL.

Signed-off-by: Archit Taneja <architt@codeaurora.org>
Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Archit Taneja 2015-04-08 11:37:40 +05:30 committed by Rob Clark
parent f28730c84f
commit 65c5e5426d
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/msm/dsi/dsi_host.c
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@ -787,6 +787,11 @@ static void dsi_ctrl_config(struct msm_dsi_host *msm_host, bool enable,
dsi_write(msm_host, REG_DSI_LANE_SWAP_CTRL,
DSI_LANE_SWAP_CTRL_DLN_SWAP_SEL(LANE_SWAP_0123));
}
if (!(flags & MIPI_DSI_CLOCK_NON_CONTINUOUS))
dsi_write(msm_host, REG_DSI_LANE_CTRL,
DSI_LANE_CTRL_CLKLN_HS_FORCE_REQUEST);
data |= DSI_CTRL_ENABLE;
dsi_write(msm_host, REG_DSI_CTRL, data);