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Merge "input: qcom-hv-haptics: only use 4-byte writes when refilling FIFO"

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qctecmdr 2020-10-25 19:42:00 -07:00 • committed by Gerrit - the friendly Code Review server
commit 45fb30f007
1 changed files with 11 additions and 0 deletions
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11
drivers/input/misc/qcom-hv-haptics.c
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@ -2282,8 +2282,19 @@ static irqreturn_t fifo_empty_irq_handler(int irq, void *data)
if (num < 0)
return IRQ_HANDLED;
/*
* With HAPTICS_PATTERN module revision 2.0 and above, if use
* 1-byte write before 4-byte write, the hardware would insert
* zeros in between to keep the FIFO samples 4-byte aligned, and
* the inserted 0 values would cause HW stop driving hence spurs
* will be seen on the haptics output. So only use 1-byte write
* at the end of FIFO streaming.
*/
if (samples_left <= num)
num = samples_left;
else if ((chip->ptn_revision >= HAP_PTN_V2) &&
(num % HAP_PTN_V2_FIFO_DIN_NUM))
num -= (num % HAP_PTN_V2_FIFO_DIN_NUM);
samples = fifo->samples + status->samples_written;