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clk: qcom: gdsc: Implement NO_RET_PERIPH flag 

In some rare occasions, we want to only set the RETAIN_MEM bit, but
not the RETAIN_PERIPH one: this is seen on at least SDM630/636/660's
GPU-GX GDSC, where unsetting and setting back the RETAIN_PERIPH bit
will generate chaos and panics during GPU suspend time (mainly, the
chaos is unaligned access).

For this reason, introduce a new NO_RET_PERIPH flag to the GDSC
driver to address this corner case.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@somainline.org>
Link: https://lore.kernel.org/r/20210113183817.447866-8-angelogioacchino.delregno@somainline.org
Signed-off-by: Stephen Boyd <sboyd@kernel.org>
This commit is contained in:
AngeloGioacchino Del Regno 2021-01-13 19:38:15 +01:00 committed by Stephen Boyd
parent 68e1d106eb
commit 785c02eb35
2 changed files with 10 additions and 3 deletions
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10
drivers/clk/qcom/gdsc.c
View File

@ -183,7 +183,10 @@ static inline int gdsc_assert_reset(struct gdsc *sc)
static inline void gdsc_force_mem_on(struct gdsc *sc)
{
int i;
u32 mask = RETAIN_MEM | RETAIN_PERIPH;
u32 mask = RETAIN_MEM;
if (!(sc->flags & NO_RET_PERIPH))
mask |= RETAIN_PERIPH;
for (i = 0; i < sc->cxc_count; i++)
regmap_update_bits(sc->regmap, sc->cxcs[i], mask, mask);
@ -192,7 +195,10 @@ static inline void gdsc_force_mem_on(struct gdsc *sc)
static inline void gdsc_clear_mem_on(struct gdsc *sc)
{
int i;
u32 mask = RETAIN_MEM | RETAIN_PERIPH;
u32 mask = RETAIN_MEM;
if (!(sc->flags & NO_RET_PERIPH))
mask |= RETAIN_PERIPH;
for (i = 0; i < sc->cxc_count; i++)
regmap_update_bits(sc->regmap, sc->cxcs[i], mask, 0);

3
drivers/clk/qcom/gdsc.h
View File

@ -42,7 +42,7 @@ struct gdsc {
#define PWRSTS_ON BIT(2)
#define PWRSTS_OFF_ON (PWRSTS_OFF | PWRSTS_ON)
#define PWRSTS_RET_ON (PWRSTS_RET | PWRSTS_ON)
const u8 flags;
const u16 flags;
#define VOTABLE BIT(0)
#define CLAMP_IO BIT(1)
#define HW_CTRL BIT(2)
@ -51,6 +51,7 @@ struct gdsc {
#define POLL_CFG_GDSCR BIT(5)
#define ALWAYS_ON BIT(6)
#define RETAIN_FF_ENABLE BIT(7)
#define NO_RET_PERIPH BIT(8)
struct reset_controller_dev *rcdev;
unsigned int *resets;
unsigned int reset_count;