Re: [PATCH v3 2/7] reset: qcom: AOSS (always on subsystem) reset controller
From: Bjorn Andersson <hidden>
Date: 2018-03-18 22:45:17
Also in:
linux-arm-msm, linux-remoteproc, lkml
On Wed 14 Mar 02:21 PDT 2018, Sibi S wrote:
quoted hunk ↗ jump to hunk
diff --git a/drivers/reset/Kconfig b/drivers/reset/Kconfig index 7fc7769..d06bd1d 100644 --- a/drivers/reset/Kconfig +++ b/drivers/reset/Kconfig@@ -81,6 +81,16 @@ config RESET_PISTACHIO help This enables the reset driver for ImgTec Pistachio SoCs. +config RESET_QCOM_AOSS + bool "Qcom AOSS Reset Driver" + depends on ARCH_QCOM || COMPILE_TEST + select MFD_SYSCON
Drop syscon
+ help + This enables the AOSS (always on subsystem) reset driver + for Qualcomm SDM845 SoCs. Say Y if you want to control + reset signals provided by AOSS for Modem, Venus, ADSP, + GPU, Camera, Wireless, Display subsystem. Otherwise, say N. +
[..]
quoted hunk ↗ jump to hunk
diff --git a/drivers/reset/reset-qcom-aoss.c b/drivers/reset/reset-qcom-aoss.c
[..]
+static const struct regmap_config sdm845_aoss_regmap_config = {
+ .name = "aoss-reset",
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x20000,
+ .fast_io = true,
+};Is there a particular reason why you're setting up a regmap and not just operate on the ioremap region directly with readl/writel? It would save you a few lines of code and some runtime memory.
+
+static const struct qcom_aoss_reset_map sdm845_aoss_resets[] = {
+ [AOSS_CC_MSS_RESTART] = { 0x0, 0 },
+ [AOSS_CC_CAMSS_RESTART] = { 0x1000, 0 },
+ [AOSS_CC_VENUS_RESTART] = { 0x2000, 0 },
+ [AOSS_CC_GPU_RESTART] = { 0x3000, 0 },
+ [AOSS_CC_DISPSS_RESTART] = { 0x4000, 0 },
+ [AOSS_CC_WCSS_RESTART] = { 0x10000, 0 },
+ [AOSS_CC_LPASS_RESTART] = { 0x20000, 0 },Do you have a case where bit != 0? If not please drop the bit until it's necessary.
+};
+
+static const struct qcom_aoss_desc sdm845_aoss_desc = {
+ .config = &sdm845_aoss_regmap_config,
+ .resets = sdm845_aoss_resets,
+ /* Wait 6 32kHz sleep cycles for reset */
+ .delay = 200,Please move this constant into qcom_aoss_control_reset(), until there's a need for it to be configurable.
+ .num_resets = ARRAY_SIZE(sdm845_aoss_resets), +}; +
[..]
+static int qcom_aoss_control_reset(struct reset_controller_dev *rcdev,
+ unsigned long idx)
+{
+ struct qcom_aoss_reset_data *data = to_qcom_aoss_reset_data(rcdev);
+ int ret;
+
+ ret = qcom_aoss_control_assert(rcdev, idx);
+ if (ret)
+ return ret;
+
+ udelay(data->desc->delay);Per Documentation/timers/timers-howto.txt please use usleep_range() when delays are between 10us and 20ms.
+ + return qcom_aoss_control_deassert(rcdev, idx); +}
Regards, Bjorn