+CC: Thierry and Alexandre
On 07/18/2014 12:56 PM, Inki Dae wrote:
> This patch adds LPM transfer support for video or command data.
>
> With this patch, Exynos MIPI DSI controller can transfer command or
> video data with HS or LP mode in accordance with mode_flags set
> by LCD Panel driver.
>
> Signed-off-by: Inki Dae <inki.dae@xxxxxxxxxxx>
> Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_dsi.c | 22 ++++++++++++++++++++--
> 1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> index 2df3592..b120554 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> @@ -426,13 +426,28 @@ static int exynos_dsi_enable_clock(struct exynos_dsi *dsi)
> | DSIM_ESC_PRESCALER(esc_div)
> | DSIM_LANE_ESC_CLK_EN_CLK
> | DSIM_LANE_ESC_CLK_EN_DATA(BIT(dsi->lanes) - 1)
> - | DSIM_BYTE_CLK_SRC(0)
> - | DSIM_TX_REQUEST_HSCLK;
> + | DSIM_BYTE_CLK_SRC(0);
> +
> + if (!(dsi->mode_flags & MIPI_DSI_MODE_CMD_LPM))
> + reg |= DSIM_TX_REQUEST_HSCLK;
> +
Maybe I missed sth but it seems to me slightly unrelated to LPM flag.
According to specs some panels can require this clock even in LPM mode.
I wonder if recently introduced MIPI_DSI_CLOCK_NON_CONTINUOUS wouldn't
handle it.
> writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
>
> return 0;
> }
>
> +static void exynos_dsi_enable_hs_clock(struct exynos_dsi *dsi,
> + bool enable)
> +{
> + u32 reg = readl(dsi->reg_base + DSIM_CLKCTRL_REG);
> +
> + reg &= ~DSIM_TX_REQUEST_HSCLK;
> + if (enable)
> + reg |= DSIM_TX_REQUEST_HSCLK;
> +
> + writel(reg, dsi->reg_base + DSIM_CLKCTRL_REG);
> +}
> +
> static void exynos_dsi_disable_clock(struct exynos_dsi *dsi)
> {
> u32 reg;
> @@ -575,6 +590,9 @@ static void exynos_dsi_set_display_enable(struct exynos_dsi *dsi, bool enable)
> {
> u32 reg;
>
> + if (!(dsi->mode_flags & MIPI_DSI_MODE_VIDEO_LPM))
> + exynos_dsi_enable_hs_clock(dsi, true);
> +
It does not care about enable argument of the function, I guess it should.
Regards
Andrzej
> reg = readl(dsi->reg_base + DSIM_MDRESOL_REG);
> if (enable)
> reg |= DSIM_MAIN_STAND_BY;
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