| Message ID | 20191119214234.27932-1-linus.walleij@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/mcde: Support using DSI in LP mode | expand |
On Tue, Nov 19, 2019 at 10:42 PM Linus Walleij <linus.walleij@linaro.org> wrote: > It is possible to set a flag in the struct mipi_dsi_device > so the panel is handled in low power (LP) mode. Some displays > only support this mode and it is also good for testing. > > Cc: Stephan Gerhold <stephan@gerhold.net> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Inki: this is the patch making the MCDE use LP mode on all commands also screen updates on command-mode panels. If this is how the flag is intended please ACK this and I'll make a patch to the documentation as well making it clear that this is the intended semantics of the flag. Yours, Linus Walleij
diff --git a/drivers/gpu/drm/mcde/mcde_dsi.c b/drivers/gpu/drm/mcde/mcde_dsi.c index 889c39efa80c..d4a12fe7ff01 100644 --- a/drivers/gpu/drm/mcde/mcde_dsi.c +++ b/drivers/gpu/drm/mcde/mcde_dsi.c @@ -648,10 +648,11 @@ static void mcde_dsi_start(struct mcde_dsi *d) /* Command mode, clear IF1 ID */ val = readl(d->regs + DSI_CMD_MODE_CTL); /* - * If we enable low-power mode here, with - * val |= DSI_CMD_MODE_CTL_IF1_LP_EN + * If we enable low-power mode here, * then display updates become really slow. */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM) + val |= DSI_CMD_MODE_CTL_IF1_LP_EN; val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK; writel(val, d->regs + DSI_CMD_MODE_CTL); @@ -740,10 +741,11 @@ static void mcde_dsi_bridge_pre_enable(struct drm_bridge *bridge) /* Command mode, clear IF1 ID */ val = readl(d->regs + DSI_CMD_MODE_CTL); /* - * If we enable low-power mode here with - * val |= DSI_CMD_MODE_CTL_IF1_LP_EN + * If we enable low-power mode here * the display updates become really slow. */ + if (d->mdsi->mode_flags & MIPI_DSI_MODE_LPM) + val |= DSI_CMD_MODE_CTL_IF1_LP_EN; val &= ~DSI_CMD_MODE_CTL_IF1_ID_MASK; writel(val, d->regs + DSI_CMD_MODE_CTL); }
It is possible to set a flag in the struct mipi_dsi_device so the panel is handled in low power (LP) mode. Some displays only support this mode and it is also good for testing. Cc: Stephan Gerhold <stephan@gerhold.net> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> --- drivers/gpu/drm/mcde/mcde_dsi.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)