On 24/04/24 11:03 am, Manikandan Muralidharan wrote: > Replace regmap_read with regmap_read_poll_timeout to neatly handle > retries > > Signed-off-by: Manikandan Muralidharan <manikandan.m@xxxxxxxxxxxxx> Acked-by: Dharma Balasubiramani <dharma.b@xxxxxxxxxxxxx> > --- > .../gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c | 44 +++++++++++-------- > 1 file changed, 25 insertions(+), 19 deletions(-) > > diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > index cc5cf4c2faf7..b229692a27ca 100644 > --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_crtc.c > @@ -203,19 +203,22 @@ static void atmel_hlcdc_crtc_atomic_disable(struct drm_crtc *c, > pm_runtime_get_sync(dev->dev); > > regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_DISP); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - (status & ATMEL_HLCDC_DISP)) > - cpu_relax(); > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + !(status & ATMEL_HLCDC_DISP), > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n"); > > regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_SYNC); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - (status & ATMEL_HLCDC_SYNC)) > - cpu_relax(); > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + !(status & ATMEL_HLCDC_SYNC), > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n"); > > regmap_write(regmap, ATMEL_HLCDC_DIS, ATMEL_HLCDC_PIXEL_CLK); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - (status & ATMEL_HLCDC_PIXEL_CLK)) > - cpu_relax(); > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + !(status & ATMEL_HLCDC_PIXEL_CLK), > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n"); > > clk_disable_unprepare(crtc->dc->hlcdc->sys_clk); > pinctrl_pm_select_sleep_state(dev->dev); > @@ -241,20 +244,23 @@ static void atmel_hlcdc_crtc_atomic_enable(struct drm_crtc *c, > clk_prepare_enable(crtc->dc->hlcdc->sys_clk); > > regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_PIXEL_CLK); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - !(status & ATMEL_HLCDC_PIXEL_CLK)) > - cpu_relax(); > - > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + status & ATMEL_HLCDC_PIXEL_CLK, > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register CLKSTS timeout\n"); > > regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_SYNC); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - !(status & ATMEL_HLCDC_SYNC)) > - cpu_relax(); > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + status & ATMEL_HLCDC_SYNC, > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register LCDSTS timeout\n"); > > regmap_write(regmap, ATMEL_HLCDC_EN, ATMEL_HLCDC_DISP); > - while (!regmap_read(regmap, ATMEL_HLCDC_SR, &status) && > - !(status & ATMEL_HLCDC_DISP)) > - cpu_relax(); > + if (regmap_read_poll_timeout(regmap, ATMEL_HLCDC_SR, status, > + status & ATMEL_HLCDC_DISP, > + 10, 1000)) > + dev_warn(dev->dev, "Atmel LCDC status register DISPSTS timeout\n"); > + > > pm_runtime_put_sync(dev->dev); > -- With Best Regards, Dharma B.
