Le 23/05/2022 à 12:47, Guillaume Ranquet a écrit :
dpintf is the displayport interface hardware unit. This unit is similar
to dpi and can reuse most of the code.
This patch adds support for mt8195-dpintf to this dpi driver. Main
differences are:
- Some features/functional components are not available for dpintf
which are now excluded from code execution once is_dpintf is set
- dpintf can and needs to choose between different clockdividers based
on the clockspeed. This is done by choosing a different clock parent.
- There are two additional clocks that need to be managed. These are
only set for dpintf and will be set to NULL if not supplied. The
clk_* calls handle these as normal clocks then.
- Some register contents differ slightly between the two components. To
work around this I added register bits/masks with a DPINTF_ prefix
and use them where different.
Based on a separate driver for dpintf created by
Jason-JH.Lin <jason-jh.lin-NuS5LvNUpcJWk0Htik3J/w@xxxxxxxxxxxxxxxx>.
Signed-off-by: Markus Schneider-Pargmann <msp-rdvid1DuHRBWk0Htik3J/w@xxxxxxxxxxxxxxxx>
Signed-off-by: Guillaume Ranquet <granquet-rdvid1DuHRBWk0Htik3J/w@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/mediatek/mtk_dpi.c | 126 +++++++++++++++++---
drivers/gpu/drm/mediatek/mtk_dpi_regs.h | 35 ++++++
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.c | 8 ++
drivers/gpu/drm/mediatek/mtk_drm_ddp_comp.h | 1 +
drivers/gpu/drm/mediatek/mtk_drm_drv.c | 5 +-
include/linux/soc/mediatek/mtk-mmsys.h | 4 +-
6 files changed, 159 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/mediatek/mtk_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c
index eb969c5c5c2e..763bfb700135 100644
--- a/drivers/gpu/drm/mediatek/mtk_dpi.c
+++ b/drivers/gpu/drm/mediatek/mtk_dpi.c
@@ -71,6 +71,7 @@ struct mtk_dpi {
void __iomem *regs;
struct device *dev;
struct clk *engine_clk;
+ struct clk *dpi_ck_cg;
struct clk *pixel_clk;
struct clk *tvd_clk;
int irq;
@@ -126,6 +127,7 @@ struct mtk_dpi_conf {
const u32 *output_fmts;
u32 num_output_fmts;
bool is_ck_de_pol;
+ bool is_dpintf;
bool swap_input_support;
/* Mask used for HWIDTH, HPORCH, VSYNC_WIDTH and VSYNC_PORCH (no shift) */
u32 dimension_mask;
@@ -438,6 +440,8 @@ static void mtk_dpi_power_off(struct mtk_dpi *dpi)
mtk_dpi_disable(dpi);
clk_disable_unprepare(dpi->pixel_clk);
clk_disable_unprepare(dpi->engine_clk);
+ clk_disable_unprepare(dpi->dpi_ck_cg);
+ clk_disable_unprepare(dpi->tvd_clk);
}
static int mtk_dpi_power_on(struct mtk_dpi *dpi)
@@ -447,12 +451,24 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
if (++dpi->refcount != 1)
return 0;
Hi,
belwo the error handling path looks odd. (both where we goto, and the
order of the clk_disable_unprepare() in the error handling path.
just my 2c,
CJ
+ ret = clk_prepare_enable(dpi->tvd_clk);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable tvd pll: %d\n", ret);
+ goto err_pixel;
+ }
+
ret = clk_prepare_enable(dpi->engine_clk);
if (ret) {
dev_err(dpi->dev, "Failed to enable engine clock: %d\n", ret);
goto err_refcount;
}
+ ret = clk_prepare_enable(dpi->dpi_ck_cg);
+ if (ret) {
+ dev_err(dpi->dev, "Failed to enable dpi_ck_cg clock: %d\n", ret);
+ goto err_ck_cg;
+ }
+
ret = clk_prepare_enable(dpi->pixel_clk);
if (ret) {
dev_err(dpi->dev, "Failed to enable pixel clock: %d\n", ret);
@@ -466,6 +482,8 @@ static int mtk_dpi_power_on(struct mtk_dpi *dpi)
return 0;
err_pixel:
+ clk_disable_unprepare(dpi->dpi_ck_cg);
+err_ck_cg:
clk_disable_unprepare(dpi->engine_clk);
err_refcount:
dpi->refcount--;
[...]
