Hi Tomi,
Thank you for the patch.
On Tue, Nov 24, 2020 at 02:45:23PM +0200, Tomi Valkeinen wrote:
> Simplify and optimize dsi_vc_enable_hs() so that it can be called
> without checking the current HS/LP mode. Make dsi_vc_enable_hs() return
> if the VC is already in the correct mode.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
> ---
> drivers/gpu/drm/omapdrm/dss/dsi.c | 10 ++++------
> 1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/omapdrm/dss/dsi.c b/drivers/gpu/drm/omapdrm/dss/dsi.c
> index 4ac82166edc3..c3f13226ac26 100644
> --- a/drivers/gpu/drm/omapdrm/dss/dsi.c
> +++ b/drivers/gpu/drm/omapdrm/dss/dsi.c
> @@ -341,7 +341,6 @@ struct dsi_data {
> int irq;
>
> bool is_enabled;
> - bool in_lp_mode;
>
> struct clk *dss_clk;
> struct regmap *syscon;
> @@ -2441,6 +2440,9 @@ static void dsi_vc_enable_hs(struct omap_dss_device *dssdev, int vc,
>
> DSSDBG("dsi_vc_enable_hs(%d, %d)\n", vc, enable);
>
> + if (REG_GET(dsi, DSI_VC_CTRL(vc), 9, 9) == enable)
> + return;
> +
I tend to prefer cached state instead of reading it back from the
hardware, as it's (marginally) more efficient. In either case,
Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
> WARN_ON(!dsi_bus_is_locked(dsi));
>
> dsi_vc_enable(dsi, vc, 0);
> @@ -2456,8 +2458,6 @@ static void dsi_vc_enable_hs(struct omap_dss_device *dssdev, int vc,
> /* start the DDR clock by sending a NULL packet */
> if (dsi->vm_timings.ddr_clk_always_on && enable)
> dsi_vc_send_null(dsi, vc, dsi->dsidev->channel);
> -
> - dsi->in_lp_mode = !enable;
> }
>
> static void dsi_vc_flush_long_data(struct dsi_data *dsi, int vc)
> @@ -4886,9 +4886,7 @@ static ssize_t _omap_dsi_host_transfer(struct dsi_data *dsi, int vc,
> struct omap_dss_device *dssdev = &dsi->output;
> int r;
>
> - if (!!(msg->flags & MIPI_DSI_MSG_USE_LPM) != dsi->in_lp_mode)
> - dsi_vc_enable_hs(dssdev, vc,
> - !(msg->flags & MIPI_DSI_MSG_USE_LPM));
> + dsi_vc_enable_hs(dssdev, vc, !(msg->flags & MIPI_DSI_MSG_USE_LPM));
>
> switch (msg->type) {
> case MIPI_DSI_GENERIC_SHORT_WRITE_0_PARAM:
--
Regards,
Laurent Pinchart
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