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SubjectRe: [PATCH v9 5/5] drm/sun4i: sun6i_mipi_dsi: Simplify dsi setup timings code
On Mon, Mar 4, 2019 at 9:20 PM Maxime Ripard <maxime.ripard@bootlin.com> wrote:
>
> On Sun, Mar 03, 2019 at 11:05:27PM +0530, Jagan Teki wrote:
> > DSI timings are varies between burst/non-burst devices and
> > current driver is handling this support via if, else statements
> > which would difficult to read.
> >
> > Simplify it by using goto to make code more readable.
> >
> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> > Tested-by: Merlijn Wajer <merlijn@wizzup.org>
> > ---
> > Note: This change is created based on previous version burst
> > changes [1] by addressing comment from [2] by Maxime to make
> > code readable.
> >
> > [1] https://patchwork.kernel.org/cover/10813623/
> > [2] https://patchwork.kernel.org/patch/10666607/
> >
> > drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 79 ++++++++++++++------------
> > 1 file changed, 42 insertions(+), 37 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > index 31ec4048804d..898f32319c2d 100644
> > --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
> > @@ -550,7 +550,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
> > {
> > struct mipi_dsi_device *device = dsi->device;
> > unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
> > - u16 hbp = 0, hfp = 0, hsa = 0, hblk = 0, vblk = 0;
> > + u16 hbp, hfp, hsa, hblk;
> > + u16 vblk = 0;
> > u32 basic_ctl = 0;
> > size_t bytes;
> > u8 *buffer;
> > @@ -558,6 +559,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
> > /* Do all timing calculations up front to allocate buffer space */
> >
> > if (device->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) {
> > + hbp = hfp = hsa = 0;
>
> This raises a checkpatch warning and isn't necessary
>
> > hblk = mode->hdisplay * Bpp;
> > basic_ctl = SUN6I_DSI_BASIC_CTL_VIDEO_BURST |
> > SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS |
> > @@ -566,48 +568,51 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
> > if (device->lanes == 4)
> > basic_ctl |= SUN6I_DSI_BASIC_CTL_TRAIL_FILL |
> > SUN6I_DSI_BASIC_CTL_TRAIL_INV(0xc);
> > - } else {
> > - /*
> > - * A sync period is composed of a blanking packet (4
> > - * bytes + payload + 2 bytes) and a sync event packet
> > - * (4 bytes). Its minimal size is therefore 10 bytes
> > - */
> > +
> > + goto alloc_buf;
>
> And I'd rather not have a goto in the middle of the code for no
> particular reason.

OK, will try to think for better simplification otherwise will drop it
in next version.

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